diff --git a/applications/utilities/mesh/manipulation/setSet/setSet.C b/applications/utilities/mesh/manipulation/setSet/setSet.C
index eaa89f2fb7..8ce92fc9b7 100644
--- a/applications/utilities/mesh/manipulation/setSet/setSet.C
+++ b/applications/utilities/mesh/manipulation/setSet/setSet.C
@@ -82,33 +82,33 @@ void writeVTK
     if (isA<faceSet>(currentSet))
     {
         // Faces of set with OpenFOAM faceID as value
-        foamVtkOutput::writeFaceSet
+        vtk::writeFaceSet
         (
             mesh,
             currentSet,
             mesh.time().path()/vtkBaseName,
-            foamVtkOutput::formatType::LEGACY_BINARY
+            vtk::formatType::LEGACY_BINARY
         );
     }
     else if (isA<cellSet>(currentSet))
     {
         // External faces of cellset with OpenFOAM cellID as value
-        foamVtkOutput::writeCellSetFaces
+        vtk::writeCellSetFaces
         (
             mesh,
             currentSet,
             mesh.time().path()/vtkBaseName,
-            foamVtkOutput::formatType::LEGACY_BINARY
+            vtk::formatType::LEGACY_BINARY
         );
     }
     else if (isA<pointSet>(currentSet))
     {
-        foamVtkOutput::writePointSet
+        vtk::writePointSet
         (
             mesh,
             currentSet,
             mesh.time().path()/vtkBaseName,
-            foamVtkOutput::formatType::LEGACY_BINARY
+            vtk::formatType::LEGACY_BINARY
         );
     }
     else
diff --git a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C
index b3813f22c3..cb5ab87414 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamToVTK.C
@@ -242,9 +242,9 @@ labelList getSelectedPatches
 // Process args for output options
 // Default from foamVtkOutputOptions is inline ASCII xml
 //
-foamVtkOutput::outputOptions getOutputOptions(const argList& args)
+vtk::outputOptions getOutputOptions(const argList& args)
 {
-    foamVtkOutput::outputOptions opts;
+    vtk::outputOptions opts;
 
     if (args.optionFound("xml"))
     {
@@ -421,7 +421,7 @@ int main(int argc, char *argv[])
     const bool noLagrangian    = args.optionFound("noLagrangian");
     const bool nearCellValue   = args.optionFound("nearCellValue");
 
-    const foamVtkOutput::outputOptions fmtType = getOutputOptions(args);
+    const vtk::outputOptions fmtType = getOutputOptions(args);
 
     if (nearCellValue)
     {
@@ -515,7 +515,7 @@ int main(int argc, char *argv[])
     meshSubsetHelper meshRef(mesh, meshSubsetHelper::SET, cellSetName);
 
     // Collect decomposition information etc.
-    foamVtkCells foamVtkMeshCells(fmtType, decomposePoly);
+    vtk::vtuCells vtuMeshCells(fmtType, decomposePoly);
 
     Info<< "VTK mesh topology: "
         << timer.cpuTimeIncrement() << " s, "
@@ -544,7 +544,7 @@ int main(int argc, char *argv[])
         )
         {
             // Trigger change for vtk cells too
-            foamVtkMeshCells.clear();
+            vtuMeshCells.clear();
         }
 
         // If faceSet: write faceSet only (as polydata)
@@ -565,7 +565,7 @@ int main(int argc, char *argv[])
             Info<< "    faceSet   : "
                 << relativeName(runTime, outputName) << nl;
 
-            foamVtkOutput::writeFaceSet
+            vtk::writeFaceSet
             (
                 meshRef.mesh(),
                 set,
@@ -593,7 +593,7 @@ int main(int argc, char *argv[])
             Info<< "    pointSet  : "
                 << relativeName(runTime, outputName) << nl;
 
-            foamVtkOutput::writePointSet
+            vtk::writePointSet
             (
                 meshRef.mesh(),
                 set,
@@ -830,14 +830,14 @@ int main(int argc, char *argv[])
 
         if (doWriteInternal)
         {
-            if (foamVtkMeshCells.empty())
+            if (vtuMeshCells.empty())
             {
-                foamVtkMeshCells.reset(meshRef.mesh());
+                vtuMeshCells.reset(meshRef.mesh());
 
                 // Convert cellMap, addPointCellLabels to global cell ids
                 if (meshRef.useSubMesh())
                 {
-                    foamVtkMeshCells.renumberCells
+                    vtuMeshCells.renumberCells
                     (
                         meshRef.subsetter().cellMap()
                     );
@@ -855,10 +855,10 @@ int main(int argc, char *argv[])
                 << relativeName(runTime, outputName) << endl;
 
             // Write mesh
-            foamVtkOutput::internalWriter writer
+            vtk::internalWriter writer
             (
                 meshRef.baseMesh(),
-                foamVtkMeshCells,
+                vtuMeshCells,
                 outputName,
                 fmtType
             );
@@ -980,7 +980,7 @@ int main(int argc, char *argv[])
                   + timeDesc
                 );
 
-                foamVtkOutput::writeSurfFields
+                vtk::writeSurfFields
                 (
                     meshRef.mesh(),
                     outputName,
@@ -1013,7 +1013,7 @@ int main(int argc, char *argv[])
             Info<< "    Combined patches     : "
                 << relativeName(runTime, outputName) << nl;
 
-            foamVtkOutput::patchWriter writer
+            vtk::patchWriter writer
             (
                 meshRef.mesh(),
                 outputName,
@@ -1083,7 +1083,7 @@ int main(int argc, char *argv[])
                 Info<< "    Patch     : "
                     << relativeName(runTime, outputName) << nl;
 
-                foamVtkOutput::patchWriter writer
+                vtk::patchWriter writer
                 (
                     meshRef.mesh(),
                     outputName,
@@ -1194,7 +1194,7 @@ int main(int argc, char *argv[])
                     mesh.points()
                 );
 
-                foamVtkOutput::surfaceMeshWriter writer
+                vtk::surfaceMeshWriter writer
                 (
                     pp,
                     fz.name(),
@@ -1281,7 +1281,7 @@ int main(int argc, char *argv[])
                 Info<< "        tensors           :";
                 print(Info, tensorNames);
 
-                foamVtkOutput::lagrangianWriter writer
+                vtk::lagrangianWriter writer
                 (
                     meshRef.mesh(),
                     cloudName,
@@ -1314,7 +1314,7 @@ int main(int argc, char *argv[])
             }
             else
             {
-                foamVtkOutput::lagrangianWriter writer
+                vtk::lagrangianWriter writer
                 (
                     meshRef.mesh(),
                     cloudName,
diff --git a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriter.C b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriter.C
index 4101672b69..959485fb19 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriter.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriter.C
@@ -29,30 +29,30 @@ License
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::lagrangianWriter::beginPiece()
+void Foam::vtk::lagrangianWriter::beginPiece()
 {
     if (!legacy_)
     {
         if (useVerts_)
         {
             format()
-                .openTag(vtkFileTag::PIECE)
-                ( "NumberOfPoints", nParcels_ )
-                ( "NumberOfVerts",  nParcels_ )
+                .openTag(vtk::fileTag::PIECE)
+                .xmlAttr(fileAttr::NUMBER_OF_POINTS, nParcels_)
+                .xmlAttr(fileAttr::NUMBER_OF_VERTS,  nParcels_)
                 .closeTag();
         }
         else
         {
             format()
-                .openTag(vtkFileTag::PIECE)
-                ( "NumberOfPoints", nParcels_ )
+                .openTag(vtk::fileTag::PIECE)
+                .xmlAttr(fileAttr::NUMBER_OF_POINTS, nParcels_)
                 .closeTag();
         }
     }
 }
 
 
-void Foam::foamVtkOutput::lagrangianWriter::writePoints()
+void Foam::vtk::lagrangianWriter::writePoints()
 {
     Cloud<passiveParticle> parcels(mesh_, cloudName_, false);
     nParcels_ = parcels.size();
@@ -67,8 +67,8 @@ void Foam::foamVtkOutput::lagrangianWriter::writePoints()
     {
         beginPiece(); // Tricky - hide in here
 
-        format().tag(vtkFileTag::POINTS)
-            .openDataArray<float,3>(vtkFileTag::POINTS)
+        format().tag(vtk::fileTag::POINTS)
+            .openDataArray<float,3>(vtk::dataArrayAttr::POINTS)
             .closeTag();
     }
 
@@ -78,7 +78,7 @@ void Foam::foamVtkOutput::lagrangianWriter::writePoints()
     {
         const point& pt = iter().position();
 
-        foamVtkOutput::write(format(), pt);
+        vtk::write(format(), pt);
     }
     format().flush();
 
@@ -86,12 +86,12 @@ void Foam::foamVtkOutput::lagrangianWriter::writePoints()
     {
         format()
             .endDataArray()
-            .endTag(vtkFileTag::POINTS);
+            .endTag(vtk::fileTag::POINTS);
     }
 }
 
 
-void Foam::foamVtkOutput::lagrangianWriter::writeVertsLegacy()
+void Foam::vtk::lagrangianWriter::writeVertsLegacy()
 {
     os_ << "VERTICES " << nParcels_ << ' ' << 2*nParcels_ << nl;
 
@@ -107,9 +107,9 @@ void Foam::foamVtkOutput::lagrangianWriter::writeVertsLegacy()
 }
 
 
-void Foam::foamVtkOutput::lagrangianWriter::writeVerts()
+void Foam::vtk::lagrangianWriter::writeVerts()
 {
-    format().tag(vtkFileTag::VERTS);
+    format().tag(vtk::fileTag::VERTS);
 
     // Same payload throughout
     const uint64_t payLoad = (nParcels_ * sizeof(label));
@@ -119,7 +119,7 @@ void Foam::foamVtkOutput::lagrangianWriter::writeVerts()
     // = linear mapping onto points
     //
     {
-        format().openDataArray<label>("connectivity")
+        format().openDataArray<label>(vtk::dataArrayAttr::CONNECTIVITY)
             .closeTag();
 
         format().writeSize(payLoad);
@@ -138,7 +138,7 @@ void Foam::foamVtkOutput::lagrangianWriter::writeVerts()
     // = linear mapping onto points (with 1 offset)
     //
     {
-        format().openDataArray<label>("offsets")
+        format().openDataArray<label>(vtk::dataArrayAttr::OFFSETS)
             .closeTag();
 
         format().writeSize(payLoad);
@@ -151,18 +151,18 @@ void Foam::foamVtkOutput::lagrangianWriter::writeVerts()
         format().endDataArray();
     }
 
-    format().endTag(vtkFileTag::VERTS);
+    format().endTag(vtk::fileTag::VERTS);
 }
 
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::lagrangianWriter::lagrangianWriter
+Foam::vtk::lagrangianWriter::lagrangianWriter
 (
     const fvMesh& mesh,
     const word& cloudName,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts,
+    const vtk::outputOptions outOpts,
     const bool dummyCloud
 )
 :
@@ -185,7 +185,7 @@ Foam::foamVtkOutput::lagrangianWriter::lagrangianWriter
 
     if (legacy_)
     {
-        legacy::fileHeader(format(), title, vtkFileTag::POLY_DATA);
+        legacy::fileHeader(format(), title, vtk::fileTag::POLY_DATA);
 
         if (dummyCloud)
         {
@@ -204,7 +204,7 @@ Foam::foamVtkOutput::lagrangianWriter::lagrangianWriter
         format()
             .xmlHeader()
             .xmlComment(title)
-            .beginVTKFile(vtkFileTag::POLY_DATA, "0.1");
+            .beginVTKFile(vtk::fileTag::POLY_DATA, "0.1");
 
         if (dummyCloud)
         {
@@ -221,19 +221,19 @@ Foam::foamVtkOutput::lagrangianWriter::lagrangianWriter
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::lagrangianWriter::~lagrangianWriter()
+Foam::vtk::lagrangianWriter::~lagrangianWriter()
 {}
 
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::lagrangianWriter::beginParcelData(label nFields)
+void Foam::vtk::lagrangianWriter::beginParcelData(label nFields)
 {
-    const vtkFileTag dataType =
+    const vtk::fileTag dataType =
     (
         useVerts_
-      ? vtkFileTag::CELL_DATA
-      : vtkFileTag::POINT_DATA
+      ? vtk::fileTag::CELL_DATA
+      : vtk::fileTag::POINT_DATA
     );
 
     if (legacy_)
@@ -247,13 +247,13 @@ void Foam::foamVtkOutput::lagrangianWriter::beginParcelData(label nFields)
 }
 
 
-void Foam::foamVtkOutput::lagrangianWriter::endParcelData()
+void Foam::vtk::lagrangianWriter::endParcelData()
 {
-    const vtkFileTag dataType =
+    const vtk::fileTag dataType =
     (
         useVerts_
-      ? vtkFileTag::CELL_DATA
-      : vtkFileTag::POINT_DATA
+      ? vtk::fileTag::CELL_DATA
+      : vtk::fileTag::POINT_DATA
     );
 
     if (!legacy_)
@@ -263,14 +263,14 @@ void Foam::foamVtkOutput::lagrangianWriter::endParcelData()
 }
 
 
-void Foam::foamVtkOutput::lagrangianWriter::writeFooter()
+void Foam::vtk::lagrangianWriter::writeFooter()
 {
     if (!legacy_)
     {
         // slight cheat. </Piece> too
-        format().endTag(vtkFileTag::PIECE);
+        format().endTag(vtk::fileTag::PIECE);
 
-        format().endTag(vtkFileTag::POLY_DATA)
+        format().endTag(vtk::fileTag::POLY_DATA)
             .endVTKFile();
     }
 }
diff --git a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriter.H b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriter.H
index 5fba971387..5457ce8c60 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriter.H
+++ b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::lagrangianWriter
+    Foam::vtk::lagrangianWriter
 
 Description
     Write fields (internal).
@@ -48,7 +48,7 @@ namespace Foam
 {
 class volPointInterpolation;
 
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -68,7 +68,7 @@ class lagrangianWriter
         //- Write lagrangian as cell data (verts) or point data?
         const bool useVerts_;
 
-        autoPtr<foamVtkOutput::formatter> format_;
+        autoPtr<vtk::formatter> format_;
 
         const word cloudName_;
 
@@ -109,7 +109,7 @@ public:
             const fvMesh& mesh,
             const word& cloudName,
             const fileName& baseName,
-            const foamVtkOutput::outputOptions outOpts,
+            const vtk::outputOptions outOpts,
             const bool dummyCloud = false
         );
 
@@ -125,7 +125,7 @@ public:
             return os_;
         }
 
-        inline foamVtkOutput::formatter& format()
+        inline vtk::formatter& format()
         {
             return format_();
         }
@@ -149,7 +149,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriterTemplates.C b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriterTemplates.C
index 6695f5d10f..bc3a2fd630 100644
--- a/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriterTemplates.C
+++ b/applications/utilities/postProcessing/dataConversion/foamToVTK/foamVtkLagrangianWriterTemplates.C
@@ -29,7 +29,7 @@ License
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 template<class Type>
-void Foam::foamVtkOutput::lagrangianWriter::writeIOField
+void Foam::vtk::lagrangianWriter::writeIOField
 (
     const wordList& objectNames
 )
@@ -94,7 +94,7 @@ void Foam::foamVtkOutput::lagrangianWriter::writeIOField
             }
 
             format().writeSize(payLoad);
-            foamVtkOutput::writeList(format(), fld);
+            vtk::writeList(format(), fld);
         }
 
         format().flush();
diff --git a/applications/utilities/postProcessing/graphics/PVReaders/PVFoamReader/vtkPVFoam/vtkPVFoamMeshVolume.C b/applications/utilities/postProcessing/graphics/PVReaders/PVFoamReader/vtkPVFoam/vtkPVFoamMeshVolume.C
index f8613a674f..18beae4583 100644
--- a/applications/utilities/postProcessing/graphics/PVReaders/PVFoamReader/vtkPVFoam/vtkPVFoamMeshVolume.C
+++ b/applications/utilities/postProcessing/graphics/PVReaders/PVFoamReader/vtkPVFoam/vtkPVFoamMeshVolume.C
@@ -119,7 +119,7 @@ vtkSmartPointer<vtkUnstructuredGrid> Foam::vtkPVFoam::volumeVTKMesh
         printMemory();
     }
 
-    foamVtuSizing sizing(mesh, decompPoly);
+    vtk::vtuSizing sizing(mesh, decompPoly);
 
     auto cellTypes = vtkSmartPointer<vtkUnsignedCharArray>::New();
 
@@ -141,28 +141,28 @@ vtkSmartPointer<vtkUnstructuredGrid> Foam::vtkPVFoam::volumeVTKMesh
         (
             cells,
             sizing.nFieldCells(),
-            sizing.sizeInternal(foamVtuSizing::slotType::CELLS)
+            sizing.sizeInternal(vtk::vtuSizing::slotType::CELLS)
         );
 
     UList<vtkIdType> cellLocationsUL =
         vtkUList
         (
             cellLocations,
-            sizing.sizeInternal(foamVtuSizing::slotType::CELLS_OFFSETS)
+            sizing.sizeInternal(vtk::vtuSizing::slotType::CELLS_OFFSETS)
         );
 
     UList<vtkIdType> facesUL =
         vtkUList
         (
             faces,
-            sizing.sizeInternal(foamVtuSizing::slotType::FACES)
+            sizing.sizeInternal(vtk::vtuSizing::slotType::FACES)
         );
 
     UList<vtkIdType> faceLocationsUL =
         vtkUList
         (
             faceLocations,
-            sizing.sizeInternal(foamVtuSizing::slotType::FACES_OFFSETS)
+            sizing.sizeInternal(vtk::vtuSizing::slotType::FACES_OFFSETS)
         );
 
 
diff --git a/src/conversion/Make/files b/src/conversion/Make/files
index 30c2812624..a5b3ffea22 100644
--- a/src/conversion/Make/files
+++ b/src/conversion/Make/files
@@ -29,8 +29,8 @@ vtk/output/foamVtkPatchWriter.H
 vtk/output/foamVtkSurfaceMeshWriter.C
 vtk/output/foamVtkWriteSurfFields.C
 
-vtk/part/foamVtkCells.C
 vtk/part/foamVtkMeshMaps.C
+vtk/part/foamVtuCells.C
 vtk/part/foamVtuSizing.C
 
 LIB = $(FOAM_LIBBIN)/libconversion
diff --git a/src/conversion/vtk/output/foamVtkInternalWriter.C b/src/conversion/vtk/output/foamVtkInternalWriter.C
index 2f07228109..49bf062e82 100644
--- a/src/conversion/vtk/output/foamVtkInternalWriter.C
+++ b/src/conversion/vtk/output/foamVtkInternalWriter.C
@@ -25,47 +25,46 @@ License
 
 #include "foamVtkInternalWriter.H"
 
-
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::internalWriter::beginPiece()
+void Foam::vtk::internalWriter::beginPiece()
 {
     if (!legacy_)
     {
         format()
-            .openTag(vtkFileTag::PIECE)
-            ( "NumberOfPoints", vtkCells_.nFieldPoints() )
-            ( "NumberOfCells",  vtkCells_.nFieldCells() )
+            .openTag(vtk::fileTag::PIECE)
+            .xmlAttr(vtk::fileAttr::NUMBER_OF_POINTS, vtuCells_.nFieldPoints())
+            .xmlAttr(vtk::fileAttr::NUMBER_OF_CELLS,  vtuCells_.nFieldCells())
             .closeTag();
     }
 }
 
 
-void Foam::foamVtkOutput::internalWriter::writePoints()
+void Foam::vtk::internalWriter::writePoints()
 {
     // payload size
-    const uint64_t payLoad = (vtkCells_.nFieldPoints() * 3 * sizeof(float));
+    const uint64_t payLoad = (vtuCells_.nFieldPoints() * 3 * sizeof(float));
 
     if (legacy_)
     {
-        legacy::beginPoints(os_, vtkCells_.nFieldPoints());
+        legacy::beginPoints(os_, vtuCells_.nFieldPoints());
     }
     else
     {
         format()
-            .tag(vtkFileTag::POINTS)
-            .openDataArray<float,3>(vtkFileTag::POINTS)
+            .tag(vtk::fileTag::POINTS)
+            .openDataArray<float,3>(vtk::dataArrayAttr::POINTS)
             .closeTag();
     }
 
     format().writeSize(payLoad);
 
-    foamVtkOutput::writeList(format(), mesh_.points());
-    foamVtkOutput::writeList
+    vtk::writeList(format(), mesh_.points());
+    vtk::writeList
     (
         format(),
         mesh_.cellCentres(),
-        vtkCells_.addPointCellLabels()
+        vtuCells_.addPointCellLabels()
     );
 
     format().flush();
@@ -74,25 +73,25 @@ void Foam::foamVtkOutput::internalWriter::writePoints()
     {
         format()
             .endDataArray()
-            .endTag(vtkFileTag::POINTS);
+            .endTag(vtk::fileTag::POINTS);
     }
 }
 
 
-void Foam::foamVtkOutput::internalWriter::writeCellsLegacy()
+void Foam::vtk::internalWriter::writeCellsLegacy()
 {
-    const List<uint8_t>& cellTypes = vtkCells_.cellTypes();
-    const labelList& vertLabels = vtkCells_.vertLabels();
+    const List<uint8_t>& cellTypes = vtuCells_.cellTypes();
+    const labelList& vertLabels = vtuCells_.vertLabels();
 
-    os_ << "CELLS " << vtkCells_.nFieldCells() << ' '
+    os_ << "CELLS " << vtuCells_.nFieldCells() << ' '
         << vertLabels.size() << nl;
 
-    foamVtkOutput::writeList(format(), vertLabels);
+    vtk::writeList(format(), vertLabels);
     format().flush();
 
     os_ << "CELL_TYPES " << cellTypes.size() << nl;
 
-    // No nComponents for char, so cannot use foamVtkOutput::writeList
+    // No nComponents for char, so cannot use vtk::writeList
     forAll(cellTypes, i)
     {
         format().write(cellTypes[i]);
@@ -101,22 +100,22 @@ void Foam::foamVtkOutput::internalWriter::writeCellsLegacy()
 }
 
 
-void Foam::foamVtkOutput::internalWriter::writeCells()
+void Foam::vtk::internalWriter::writeCells()
 {
-    format().tag(vtkFileTag::CELLS);
+    format().tag(vtk::fileTag::CELLS);
 
     //
     // 'connectivity'
     //
     {
-        const labelList& vertLabels = vtkCells_.vertLabels();
+        const labelList& vertLabels = vtuCells_.vertLabels();
         const uint64_t payLoad = vertLabels.size() * sizeof(label);
 
-        format().openDataArray<label>("connectivity")
+        format().openDataArray<label>(vtk::dataArrayAttr::CONNECTIVITY)
             .closeTag();
 
         format().writeSize(payLoad);
-        foamVtkOutput::writeList(format(), vertLabels);
+        vtk::writeList(format(), vertLabels);
         format().flush();
 
         format().endDataArray();
@@ -127,14 +126,14 @@ void Foam::foamVtkOutput::internalWriter::writeCells()
     // 'offsets'  (connectivity offsets)
     //
     {
-        const labelList& vertOffsets = vtkCells_.vertOffsets();
+        const labelList& vertOffsets = vtuCells_.vertOffsets();
         const uint64_t payLoad = vertOffsets.size() * sizeof(label);
 
-        format().openDataArray<label>("offsets")
+        format().openDataArray<label>(vtk::dataArrayAttr::OFFSETS)
             .closeTag();
 
         format().writeSize(payLoad);
-        foamVtkOutput::writeList(format(), vertOffsets);
+        vtk::writeList(format(), vertOffsets);
         format().flush();
 
         format().endDataArray();
@@ -145,16 +144,16 @@ void Foam::foamVtkOutput::internalWriter::writeCells()
     // 'types' (cell types)
     //
     {
-        const List<uint8_t>& cellTypes = vtkCells_.cellTypes();
+        const List<uint8_t>& cellTypes = vtuCells_.cellTypes();
         const uint64_t payLoad = cellTypes.size() * sizeof(uint8_t);
 
-        format().openDataArray<uint8_t>("types")
+        format().openDataArray<uint8_t>(vtk::dataArrayAttr::TYPES)
             .closeTag();
 
         format().writeSize(payLoad);
         forAll(cellTypes, i)
         {
-            // No nComponents for char, cannot use foamVtkOutput::writeList here
+            // No nComponents for char, cannot use vtk::writeList here
             format().write(cellTypes[i]);
         }
         format().flush();
@@ -166,9 +165,9 @@ void Foam::foamVtkOutput::internalWriter::writeCells()
     //
     // can quit here if there are NO face streams
     //
-    if (vtkCells_.faceLabels().empty())
+    if (vtuCells_.faceLabels().empty())
     {
-        format().endTag(vtkFileTag::CELLS);
+        format().endTag(vtk::fileTag::CELLS);
 
         return;
     }
@@ -180,14 +179,14 @@ void Foam::foamVtkOutput::internalWriter::writeCells()
     // 'faces' (face streams)
     //
     {
-        const labelList& faceLabels = vtkCells_.faceLabels();
+        const labelList& faceLabels = vtuCells_.faceLabels();
         const uint64_t payLoad = faceLabels.size() * sizeof(label);
 
-        format().openDataArray<label>("faces")
+        format().openDataArray<label>(vtk::dataArrayAttr::FACES)
             .closeTag();
 
         format().writeSize(payLoad);
-        foamVtkOutput::writeList(format(), faceLabels);
+        vtk::writeList(format(), faceLabels);
         format().flush();
 
         format().endDataArray();
@@ -198,24 +197,24 @@ void Foam::foamVtkOutput::internalWriter::writeCells()
     // -1 to indicate that the cell is a primitive type that does not
     // have a face stream
     {
-        const labelList& faceOffsets = vtkCells_.faceOffsets();
+        const labelList& faceOffsets = vtuCells_.faceOffsets();
         const uint64_t payLoad = faceOffsets.size() * sizeof(label);
 
-        format().openDataArray<label>("faceoffsets")
+        format().openDataArray<label>(vtk::dataArrayAttr::FACEOFFSETS)
             .closeTag();
 
         format().writeSize(payLoad);
-        foamVtkOutput::writeList(format(), faceOffsets);
+        vtk::writeList(format(), faceOffsets);
         format().flush();
 
         format().endDataArray();
     }
 
-    format().endTag(vtkFileTag::CELLS);
+    format().endTag(vtk::fileTag::CELLS);
 }
 
 
-void Foam::foamVtkOutput::internalWriter::writeMesh()
+void Foam::vtk::internalWriter::writeMesh()
 {
     writePoints();
     if (legacy_)
@@ -231,18 +230,18 @@ void Foam::foamVtkOutput::internalWriter::writeMesh()
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::internalWriter::internalWriter
+Foam::vtk::internalWriter::internalWriter
 (
     const fvMesh& mesh,
-    const foamVtkCells& cells,
+    const vtk::vtuCells& cells,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts
+    const vtk::outputOptions outOpts
 )
 :
     mesh_(mesh),
     legacy_(outOpts.legacy()),
     format_(),
-    vtkCells_(cells),
+    vtuCells_(cells),
     os_()
 {
     outputOptions opts(outOpts);
@@ -255,7 +254,7 @@ Foam::foamVtkOutput::internalWriter::internalWriter
 
     if (legacy_)
     {
-        legacy::fileHeader(format(), title, vtkFileTag::UNSTRUCTURED_GRID);
+        legacy::fileHeader(format(), title, vtk::fileTag::UNSTRUCTURED_GRID);
     }
     else
     {
@@ -264,7 +263,7 @@ Foam::foamVtkOutput::internalWriter::internalWriter
         format()
             .xmlHeader()
             .xmlComment(title)
-            .beginVTKFile(vtkFileTag::UNSTRUCTURED_GRID, "0.1");
+            .beginVTKFile(vtk::fileTag::UNSTRUCTURED_GRID, "0.1");
     }
 
     beginPiece();
@@ -274,91 +273,91 @@ Foam::foamVtkOutput::internalWriter::internalWriter
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::internalWriter::~internalWriter()
+Foam::vtk::internalWriter::~internalWriter()
 {}
 
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 
-void Foam::foamVtkOutput::internalWriter::beginCellData(label nFields)
+void Foam::vtk::internalWriter::beginCellData(label nFields)
 {
     if (legacy_)
     {
         legacy::dataHeader
         (
             os(),
-            vtkFileTag::CELL_DATA,
-            vtkCells_.nFieldCells(),
+            vtk::fileTag::CELL_DATA,
+            vtuCells_.nFieldCells(),
             nFields
         );
     }
     else
     {
-        format().tag(vtkFileTag::CELL_DATA);
+        format().tag(vtk::fileTag::CELL_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::internalWriter::endCellData()
+void Foam::vtk::internalWriter::endCellData()
 {
     if (!legacy_)
     {
-        format().endTag(vtkFileTag::CELL_DATA);
+        format().endTag(vtk::fileTag::CELL_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::internalWriter::beginPointData(label nFields)
+void Foam::vtk::internalWriter::beginPointData(label nFields)
 {
     if (legacy_)
     {
         legacy::dataHeader
         (
             os(),
-            vtkFileTag::POINT_DATA,
-            vtkCells_.nFieldPoints(),
+            vtk::fileTag::POINT_DATA,
+            vtuCells_.nFieldPoints(),
             nFields
         );
     }
     else
     {
-        format().tag(vtkFileTag::POINT_DATA);
+        format().tag(vtk::fileTag::POINT_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::internalWriter::endPointData()
+void Foam::vtk::internalWriter::endPointData()
 {
     if (!legacy_)
     {
-        format().endTag(vtkFileTag::POINT_DATA);
+        format().endTag(vtk::fileTag::POINT_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::internalWriter::writeFooter()
+void Foam::vtk::internalWriter::writeFooter()
 {
     if (!legacy_)
     {
         // slight cheat. </Piece> too
-        format().endTag(vtkFileTag::PIECE);
+        format().endTag(vtk::fileTag::PIECE);
 
-        format().endTag(vtkFileTag::UNSTRUCTURED_GRID)
+        format().endTag(vtk::fileTag::UNSTRUCTURED_GRID)
             .endVTKFile();
     }
 }
 
 
-void Foam::foamVtkOutput::internalWriter::writeCellIDs()
+void Foam::vtk::internalWriter::writeCellIDs()
 {
     // Cell ids first
-    const labelList& cellMap = vtkCells_.cellMap();
-    const uint64_t payLoad = vtkCells_.nFieldCells() * sizeof(label);
+    const labelList& cellMap = vtuCells_.cellMap();
+    const uint64_t payLoad = vtuCells_.nFieldCells() * sizeof(label);
 
     if (legacy_)
     {
-        os_ << "cellID 1 " << vtkCells_.nFieldCells() << " int" << nl;
+        os_ << "cellID 1 " << vtuCells_.nFieldCells() << " int" << nl;
     }
     else
     {
@@ -368,7 +367,7 @@ void Foam::foamVtkOutput::internalWriter::writeCellIDs()
 
     format().writeSize(payLoad);
 
-    foamVtkOutput::writeList(format(), cellMap);
+    vtk::writeList(format(), cellMap);
     format().flush();
 
     if (!legacy_)
diff --git a/src/conversion/vtk/output/foamVtkInternalWriter.H b/src/conversion/vtk/output/foamVtkInternalWriter.H
index 93cd54f960..2751cd6785 100644
--- a/src/conversion/vtk/output/foamVtkInternalWriter.H
+++ b/src/conversion/vtk/output/foamVtkInternalWriter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::internalWriter
+    Foam::vtk::internalWriter
 
 Description
     Write fields (internal).
@@ -40,9 +40,9 @@ SourceFiles
 #include "volFields.H"
 #include "pointFields.H"
 
-#include "foamVtkCells.H"
 #include "foamVtkOutputFields.H"
 #include "foamVtkOutputOptions.H"
+#include "foamVtuCells.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -50,7 +50,7 @@ namespace Foam
 {
 class volPointInterpolation;
 
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -67,10 +67,10 @@ class internalWriter
         //- Commonly used query
         const bool legacy_;
 
-        autoPtr<foamVtkOutput::formatter> format_;
+        autoPtr<vtk::formatter> format_;
 
         //- The volume cells (internalMesh)
-        const foamVtkCells& vtkCells_;
+        const vtuCells& vtuCells_;
 
         std::ofstream os_;
 
@@ -108,9 +108,9 @@ public:
         internalWriter
         (
             const fvMesh& mesh,
-            const foamVtkCells& cells,
+            const vtk::vtuCells& cells,
             const fileName& baseName,
-            const foamVtkOutput::outputOptions outOpts
+            const vtk::outputOptions outOpts
         );
 
 
@@ -125,7 +125,7 @@ public:
             return os_;
         }
 
-        inline foamVtkOutput::formatter& format()
+        inline vtk::formatter& format()
         {
             return format_();
         }
@@ -212,7 +212,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/conversion/vtk/output/foamVtkInternalWriterTemplates.C b/src/conversion/vtk/output/foamVtkInternalWriterTemplates.C
index 0770dc0571..c316c36d14 100644
--- a/src/conversion/vtk/output/foamVtkInternalWriterTemplates.C
+++ b/src/conversion/vtk/output/foamVtkInternalWriterTemplates.C
@@ -31,12 +31,12 @@ License
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 template<class Type>
-void Foam::foamVtkOutput::internalWriter::write
+void Foam::vtk::internalWriter::write
 (
     const UPtrList<const DimensionedField<Type, volMesh>>& flds
 )
 {
-    const labelList& cellMap = vtkCells_.cellMap();
+    const labelList& cellMap = vtuCells_.cellMap();
 
     const int nCmpt(pTraits<Type>::nComponents);
     // const uint64_t payLoad(cellMap.size() * nCmpt * sizeof(float));
@@ -56,7 +56,7 @@ void Foam::foamVtkOutput::internalWriter::write
         }
 
         // writeField includes payload size
-        foamVtkOutput::writeField(format(), fld, cellMap);
+        vtk::writeField(format(), fld, cellMap);
 
         if (!legacy_)
         {
@@ -67,12 +67,12 @@ void Foam::foamVtkOutput::internalWriter::write
 
 
 template<class Type, template<class> class PatchField>
-void Foam::foamVtkOutput::internalWriter::write
+void Foam::vtk::internalWriter::write
 (
     const UPtrList<const GeometricField<Type, PatchField, volMesh>>& flds
 )
 {
-    const labelList& cellMap = vtkCells_.cellMap();
+    const labelList& cellMap = vtuCells_.cellMap();
 
     const int nCmpt(pTraits<Type>::nComponents);
     // const uint64_t payLoad(cellMap.size() * nCmpt * sizeof(float));
@@ -92,7 +92,7 @@ void Foam::foamVtkOutput::internalWriter::write
         }
 
         // writeField includes payload size
-        foamVtkOutput::writeField(format(), fld, cellMap);
+        vtk::writeField(format(), fld, cellMap);
 
         if (!legacy_)
         {
@@ -103,15 +103,15 @@ void Foam::foamVtkOutput::internalWriter::write
 
 
 template<class Type, template<class> class PatchField>
-void Foam::foamVtkOutput::internalWriter::write
+void Foam::vtk::internalWriter::write
 (
     const UPtrList<const GeometricField<Type, PatchField, pointMesh>>& flds
 )
 {
-    const labelList& addPointCellLabels = vtkCells_.addPointCellLabels();
+    const labelList& addPointCellLabels = vtuCells_.addPointCellLabels();
 
     const int nCmpt(pTraits<Type>::nComponents);
-    const int nVals(vtkCells_.nFieldPoints());
+    const int nVals(vtuCells_.nFieldPoints());
 
     // Only needed for non-legacy
     const uint64_t payLoad(nVals * nCmpt * sizeof(float));
@@ -131,12 +131,12 @@ void Foam::foamVtkOutput::internalWriter::write
         }
 
         format().writeSize(payLoad);
-        foamVtkOutput::writeList(format(), fld);
+        vtk::writeList(format(), fld);
 
         forAll(addPointCellLabels, i)
         {
             const Type val = interpolatePointToCell(fld, addPointCellLabels[i]);
-            foamVtkOutput::write(format(), val);
+            vtk::write(format(), val);
         }
 
         format().flush();
@@ -150,16 +150,16 @@ void Foam::foamVtkOutput::internalWriter::write
 
 
 template<class Type>
-void Foam::foamVtkOutput::internalWriter::write
+void Foam::vtk::internalWriter::write
 (
     const volPointInterpolation& pInterp,
     const UPtrList<const DimensionedField<Type, volMesh>>& flds
 )
 {
-    const labelList& addPointCellLabels = vtkCells_.addPointCellLabels();
+    const labelList& addPointCellLabels = vtuCells_.addPointCellLabels();
 
     const int nCmpt(pTraits<Type>::nComponents);
-    const int nVals(vtkCells_.nFieldPoints());
+    const int nVals(vtuCells_.nFieldPoints());
 
     // Only needed for non-legacy
     const uint64_t payLoad(nVals * nCmpt * sizeof(float));
@@ -180,8 +180,8 @@ void Foam::foamVtkOutput::internalWriter::write
         }
 
         format().writeSize(payLoad);
-        foamVtkOutput::writeList(format(), pfield);
-        foamVtkOutput::writeList(format(), vfield, addPointCellLabels);
+        vtk::writeList(format(), pfield);
+        vtk::writeList(format(), vfield, addPointCellLabels);
         format().flush();
 
         if (!legacy_)
@@ -193,16 +193,16 @@ void Foam::foamVtkOutput::internalWriter::write
 
 
 template<class Type, template<class> class PatchField>
-void Foam::foamVtkOutput::internalWriter::write
+void Foam::vtk::internalWriter::write
 (
     const volPointInterpolation& pInterp,
     const UPtrList<const GeometricField<Type, PatchField, volMesh>>& flds
 )
 {
-    const labelList& addPointCellLabels = vtkCells_.addPointCellLabels();
+    const labelList& addPointCellLabels = vtuCells_.addPointCellLabels();
 
     const int nCmpt(pTraits<Type>::nComponents);
-    const int nVals(vtkCells_.nFieldPoints());
+    const int nVals(vtuCells_.nFieldPoints());
 
     // Only needed for non-legacy
     const uint64_t payLoad(nVals * nCmpt * sizeof(float));
@@ -223,8 +223,8 @@ void Foam::foamVtkOutput::internalWriter::write
         }
 
         format().writeSize(payLoad);
-        foamVtkOutput::writeList(format(), pfield);
-        foamVtkOutput::writeList(format(), vfield, addPointCellLabels);
+        vtk::writeList(format(), pfield);
+        vtk::writeList(format(), vfield, addPointCellLabels);
         format().flush();
 
         if (!legacy_)
diff --git a/src/conversion/vtk/output/foamVtkOutputFields.H b/src/conversion/vtk/output/foamVtkOutputFields.H
index 52bed6d037..116aadbfeb 100644
--- a/src/conversion/vtk/output/foamVtkOutputFields.H
+++ b/src/conversion/vtk/output/foamVtkOutputFields.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 InNamespace
-    Foam::foamVtkOutput
+    Foam::vtk
 
 Description
     Additional functions for writing fields in VTK format.
@@ -42,36 +42,17 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-    //- Write internalField for mesh
-    //  The output includes the payload size and flush.
-    template<class Type>
-    void writeField
-    (
-        foamVtkOutput::formatter& fmt,
-        const GeometricField<Type, fvPatchField, volMesh>& fld
-    );
-
-    //- Write internalField based on the cellMap
-    //  The output includes the payload size and flush.
-    template<class Type>
-    void writeField
-    (
-        foamVtkOutput::formatter& fmt,
-        const GeometricField<Type, fvPatchField, volMesh>& fld,
-        const UList<label>& cellMap
-    );
-
     //- Write DimensionedField for mesh
     //  The output includes the payload size and flush.
     template<class Type>
     void writeField
     (
-        foamVtkOutput::formatter& fmt,
+        vtk::formatter& fmt,
         const DimensionedField<Type, volMesh>& fld
     );
 
@@ -80,15 +61,34 @@ namespace foamVtkOutput
     template<class Type>
     void writeField
     (
-        foamVtkOutput::formatter& fmt,
+        vtk::formatter& fmt,
         const DimensionedField<Type, volMesh>& fld,
         const UList<label>& cellMap
     );
 
+    //- Write internalField for mesh
+    //  The output includes the payload size and flush.
+    template<class Type>
+    void writeField
+    (
+        vtk::formatter& fmt,
+        const GeometricField<Type, fvPatchField, volMesh>& fld
+    );
+
+    //- Write internalField based on the cellMap
+    //  The output includes the payload size and flush.
+    template<class Type>
+    void writeField
+    (
+        vtk::formatter& fmt,
+        const GeometricField<Type, fvPatchField, volMesh>& fld,
+        const UList<label>& cellMap
+    );
+
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 
diff --git a/src/conversion/vtk/output/foamVtkOutputFieldsTemplates.C b/src/conversion/vtk/output/foamVtkOutputFieldsTemplates.C
index 74ea384864..b462922416 100644
--- a/src/conversion/vtk/output/foamVtkOutputFieldsTemplates.C
+++ b/src/conversion/vtk/output/foamVtkOutputFieldsTemplates.C
@@ -25,49 +25,11 @@ License
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-template<class Type>
-void Foam::foamVtkOutput::writeField
-(
-    foamVtkOutput::formatter& fmt,
-    const GeometricField<Type, fvPatchField, volMesh>& fld
-)
-{
-    const uint64_t payLoad =
-    (
-        fld.size() * pTraits<Type>::nComponents * sizeof(float)
-    );
-
-    fmt.writeSize(payLoad);
-    writeList(fmt, fld.internalField());
-
-    fmt.flush();
-}
-
 
 template<class Type>
-void Foam::foamVtkOutput::writeField
+void Foam::vtk::writeField
 (
-    foamVtkOutput::formatter& fmt,
-    const GeometricField<Type, fvPatchField, volMesh>& fld,
-    const UList<label>& cellMap
-)
-{
-    const uint64_t payLoad =
-    (
-        cellMap.size() * pTraits<Type>::nComponents * sizeof(float)
-    );
-
-    fmt.writeSize(payLoad);
-    writeList(fmt, fld.internalField(), cellMap);
-
-    fmt.flush();
-}
-
-
-template<class Type>
-void Foam::foamVtkOutput::writeField
-(
-    foamVtkOutput::formatter& fmt,
+    vtk::formatter& fmt,
     const DimensionedField<Type, volMesh>& fld
 )
 {
@@ -84,9 +46,9 @@ void Foam::foamVtkOutput::writeField
 
 
 template<class Type>
-void Foam::foamVtkOutput::writeField
+void Foam::vtk::writeField
 (
-    foamVtkOutput::formatter& fmt,
+    vtk::formatter& fmt,
     const DimensionedField<Type, volMesh>& fld,
     const UList<label>& cellMap
 )
@@ -103,4 +65,43 @@ void Foam::foamVtkOutput::writeField
 }
 
 
+template<class Type>
+void Foam::vtk::writeField
+(
+    vtk::formatter& fmt,
+    const GeometricField<Type, fvPatchField, volMesh>& fld
+)
+{
+    const uint64_t payLoad =
+    (
+        fld.size() * pTraits<Type>::nComponents * sizeof(float)
+    );
+
+    fmt.writeSize(payLoad);
+    writeList(fmt, fld.internalField());
+
+    fmt.flush();
+}
+
+
+template<class Type>
+void Foam::vtk::writeField
+(
+    vtk::formatter& fmt,
+    const GeometricField<Type, fvPatchField, volMesh>& fld,
+    const UList<label>& cellMap
+)
+{
+    const uint64_t payLoad =
+    (
+        cellMap.size() * pTraits<Type>::nComponents * sizeof(float)
+    );
+
+    fmt.writeSize(payLoad);
+    writeList(fmt, fld.internalField(), cellMap);
+
+    fmt.flush();
+}
+
+
 // ************************************************************************* //
diff --git a/src/conversion/vtk/output/foamVtkPatchWriter.C b/src/conversion/vtk/output/foamVtkPatchWriter.C
index f52a0c9a0f..ebaef3ce86 100644
--- a/src/conversion/vtk/output/foamVtkPatchWriter.C
+++ b/src/conversion/vtk/output/foamVtkPatchWriter.C
@@ -29,25 +29,24 @@ License
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::patchWriter::beginPiece()
+void Foam::vtk::patchWriter::beginPiece()
 {
     if (!legacy_)
     {
         format()
-            .openTag(vtkFileTag::PIECE)
-            ( "NumberOfPoints", nPoints_ )
-            ( "NumberOfPolys",  nFaces_ )
+            .openTag(vtk::fileTag::PIECE)
+            .xmlAttr(vtk::fileAttr::NUMBER_OF_POINTS, nPoints_)
+            .xmlAttr(vtk::fileAttr::NUMBER_OF_POLYS,  nFaces_)
             .closeTag();
     }
 }
 
 
-void Foam::foamVtkOutput::patchWriter::writePoints()
+void Foam::vtk::patchWriter::writePoints()
 {
     const polyBoundaryMesh& patches = mesh_.boundaryMesh();
 
-    // payload count
-    const uint64_t payLoad = (nPoints_*3* sizeof(float));
+    const uint64_t payLoad = (nPoints_*3*sizeof(float));
 
     if (legacy_)
     {
@@ -55,8 +54,8 @@ void Foam::foamVtkOutput::patchWriter::writePoints()
     }
     else
     {
-        format().tag(vtkFileTag::POINTS)
-            .openDataArray<float, 3>(vtkFileTag::POINTS)
+        format().tag(vtk::fileTag::POINTS)
+            .openDataArray<float, 3>(vtk::dataArrayAttr::POINTS)
             .closeTag();
     }
 
@@ -66,7 +65,7 @@ void Foam::foamVtkOutput::patchWriter::writePoints()
     {
         const polyPatch& pp = patches[patchIDs_[i]];
 
-        foamVtkOutput::writeList(format(), pp.localPoints());
+        vtk::writeList(format(), pp.localPoints());
     }
     format().flush();
 
@@ -74,12 +73,12 @@ void Foam::foamVtkOutput::patchWriter::writePoints()
     {
         format()
             .endDataArray()
-            .endTag(vtkFileTag::POINTS);
+            .endTag(vtk::fileTag::POINTS);
     }
 }
 
 
-void Foam::foamVtkOutput::patchWriter::writePolysLegacy()
+void Foam::vtk::patchWriter::writePolysLegacy()
 {
     const polyBoundaryMesh& patches = mesh_.boundaryMesh();
 
@@ -123,7 +122,7 @@ void Foam::foamVtkOutput::patchWriter::writePolysLegacy()
 }
 
 
-void Foam::foamVtkOutput::patchWriter::writePolys()
+void Foam::vtk::patchWriter::writePolys()
 {
     const polyBoundaryMesh& patches = mesh_.boundaryMesh();
 
@@ -131,7 +130,7 @@ void Foam::foamVtkOutput::patchWriter::writePolys()
     // 'connectivity'
     //
 
-    format().tag(vtkFileTag::POLYS);
+    format().tag(vtk::fileTag::POLYS);
 
     //
     // 'connectivity'
@@ -150,7 +149,7 @@ void Foam::foamVtkOutput::patchWriter::writePolys()
             }
         }
 
-        format().openDataArray<label>("connectivity")
+        format().openDataArray<label>(vtk::dataArrayAttr::CONNECTIVITY)
             .closeTag();
 
         // payload size
@@ -185,7 +184,7 @@ void Foam::foamVtkOutput::patchWriter::writePolys()
     //
     {
         format()
-            .openDataArray<label>("offsets")
+            .openDataArray<label>(vtk::dataArrayAttr::OFFSETS)
             .closeTag();
 
         // payload size
@@ -208,11 +207,11 @@ void Foam::foamVtkOutput::patchWriter::writePolys()
         format().endDataArray();
     }
 
-    format().endTag(vtkFileTag::POLYS);
+    format().endTag(vtk::fileTag::POLYS);
 }
 
 
-void Foam::foamVtkOutput::patchWriter::writeMesh()
+void Foam::vtk::patchWriter::writeMesh()
 {
     writePoints();
     if (legacy_)
@@ -228,11 +227,11 @@ void Foam::foamVtkOutput::patchWriter::writeMesh()
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::patchWriter::patchWriter
+Foam::vtk::patchWriter::patchWriter
 (
     const fvMesh& mesh,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts,
+    const vtk::outputOptions outOpts,
     const bool nearCellValue,
     const labelList& patchIDs
 )
@@ -274,7 +273,7 @@ Foam::foamVtkOutput::patchWriter::patchWriter
 
     if (legacy_)
     {
-        legacy::fileHeader(format(), title, vtkFileTag::POLY_DATA);
+        legacy::fileHeader(format(), title, vtk::fileTag::POLY_DATA);
     }
     else
     {
@@ -283,7 +282,7 @@ Foam::foamVtkOutput::patchWriter::patchWriter
         format()
             .xmlHeader()
             .xmlComment(title)
-            .beginVTKFile(vtkFileTag::POLY_DATA, "0.1");
+            .beginVTKFile(vtk::fileTag::POLY_DATA, "0.1");
     }
 
     beginPiece();
@@ -293,82 +292,82 @@ Foam::foamVtkOutput::patchWriter::patchWriter
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::patchWriter::~patchWriter()
+Foam::vtk::patchWriter::~patchWriter()
 {}
 
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::patchWriter::beginCellData(label nFields)
+void Foam::vtk::patchWriter::beginCellData(label nFields)
 {
     if (legacy_)
     {
         legacy::dataHeader
         (
             os(),
-            vtkFileTag::CELL_DATA,
+            vtk::fileTag::CELL_DATA,
             nFaces_,
             nFields
         );
     }
     else
     {
-        format().tag(vtkFileTag::CELL_DATA);
+        format().tag(vtk::fileTag::CELL_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::patchWriter::endCellData()
+void Foam::vtk::patchWriter::endCellData()
 {
     if (!legacy_)
     {
-        format().endTag(vtkFileTag::CELL_DATA);
+        format().endTag(vtk::fileTag::CELL_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::patchWriter::beginPointData(label nFields)
+void Foam::vtk::patchWriter::beginPointData(label nFields)
 {
     if (legacy_)
     {
         legacy::dataHeader
         (
             os(),
-            vtkFileTag::POINT_DATA,
+            vtk::fileTag::POINT_DATA,
             nPoints_,
             nFields
         );
     }
     else
     {
-        format().tag(vtkFileTag::POINT_DATA);
+        format().tag(vtk::fileTag::POINT_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::patchWriter::endPointData()
+void Foam::vtk::patchWriter::endPointData()
 {
     if (!legacy_)
     {
-        format().endTag(vtkFileTag::POINT_DATA);
+        format().endTag(vtk::fileTag::POINT_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::patchWriter::writeFooter()
+void Foam::vtk::patchWriter::writeFooter()
 {
     if (!legacy_)
     {
         // slight cheat. </Piece> too
-        format().endTag(vtkFileTag::PIECE);
+        format().endTag(vtk::fileTag::PIECE);
 
-        format().endTag(vtkFileTag::POLY_DATA)
+        format().endTag(vtk::fileTag::POLY_DATA)
             .endVTKFile();
     }
 }
 
 
-void Foam::foamVtkOutput::patchWriter::writePatchIDs()
+void Foam::vtk::patchWriter::writePatchIDs()
 {
     // Patch ids first
     const uint64_t payLoad = nFaces_ * sizeof(label);
diff --git a/src/conversion/vtk/output/foamVtkPatchWriter.H b/src/conversion/vtk/output/foamVtkPatchWriter.H
index 259050c27c..76b21ea436 100644
--- a/src/conversion/vtk/output/foamVtkPatchWriter.H
+++ b/src/conversion/vtk/output/foamVtkPatchWriter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::patchWriter
+    Foam::vtk::patchWriter
 
 Description
     Write patch fields
@@ -50,7 +50,7 @@ namespace Foam
 {
 class volPointInterpolation;
 
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -67,7 +67,7 @@ class patchWriter
         //- Commonly used query
         const bool legacy_;
 
-        autoPtr<foamVtkOutput::formatter> format_;
+        autoPtr<vtk::formatter> format_;
 
         const bool nearCellValue_;
 
@@ -114,7 +114,7 @@ public:
         (
             const fvMesh& mesh,
             const fileName& baseName,
-            const foamVtkOutput::outputOptions outOpts,
+            const vtk::outputOptions outOpts,
             const bool nearCellValue,
             const labelList& patchIDs
         );
@@ -131,7 +131,7 @@ public:
             return os_;
         }
 
-        inline foamVtkOutput::formatter& format()
+        inline vtk::formatter& format()
         {
             return format_();
         }
@@ -202,7 +202,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/conversion/vtk/output/foamVtkPatchWriterTemplates.C b/src/conversion/vtk/output/foamVtkPatchWriterTemplates.C
index 4c23bdc016..58fbadffb6 100644
--- a/src/conversion/vtk/output/foamVtkPatchWriterTemplates.C
+++ b/src/conversion/vtk/output/foamVtkPatchWriterTemplates.C
@@ -29,7 +29,7 @@ License
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 template<class Type, template<class> class PatchField>
-void Foam::foamVtkOutput::patchWriter::write
+void Foam::vtk::patchWriter::write
 (
     const UPtrList<const GeometricField<Type, PatchField, volMesh>>& flds
 )
@@ -59,11 +59,11 @@ void Foam::foamVtkOutput::patchWriter::write
 
             if (nearCellValue_)
             {
-                foamVtkOutput::writeList(format(), pfld.patchInternalField()());
+                vtk::writeList(format(), pfld.patchInternalField()());
             }
             else
             {
-                foamVtkOutput::writeList(format(), pfld);
+                vtk::writeList(format(), pfld);
             }
         }
 
@@ -78,7 +78,7 @@ void Foam::foamVtkOutput::patchWriter::write
 
 
 template<class Type, template<class> class PatchField>
-void Foam::foamVtkOutput::patchWriter::write
+void Foam::vtk::patchWriter::write
 (
     const UPtrList<const GeometricField<Type, PatchField, pointMesh>>& flds
 )
@@ -106,7 +106,7 @@ void Foam::foamVtkOutput::patchWriter::write
         {
             const auto& pfld = fld.boundaryField()[patchIDs_[i]];
 
-            foamVtkOutput::writeList(format(), pfld.patchInternalField()());
+            vtk::writeList(format(), pfld.patchInternalField()());
         }
 
         format().flush();
@@ -120,7 +120,7 @@ void Foam::foamVtkOutput::patchWriter::write
 
 
 template<class Type>
-void Foam::foamVtkOutput::patchWriter::write
+void Foam::vtk::patchWriter::write
 (
     const PrimitivePatchInterpolation<primitivePatch>& pInter,
     const UPtrList<const GeometricField<Type, fvPatchField, volMesh>>& flds
@@ -154,13 +154,13 @@ void Foam::foamVtkOutput::patchWriter::write
                 auto tfield =
                     pInter.faceToPointInterpolate(pfld.patchInternalField()());
 
-                foamVtkOutput::writeList(format(), tfield());
+                vtk::writeList(format(), tfield());
             }
             else
             {
                 auto tfield = pInter.faceToPointInterpolate(pfld);
 
-                foamVtkOutput::writeList(format(), tfield());
+                vtk::writeList(format(), tfield());
             }
         }
 
diff --git a/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.C b/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.C
index c60e18378b..df54f039cd 100644
--- a/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.C
+++ b/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.C
@@ -29,22 +29,21 @@ License
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::surfaceMeshWriter::beginPiece()
+void Foam::vtk::surfaceMeshWriter::beginPiece()
 {
     if (!legacy_)
     {
         format()
-            .openTag(vtkFileTag::PIECE)
-            ( "NumberOfPoints", pp_.nPoints() )
-            ( "NumberOfPolys",  pp_.size() )
+            .openTag(vtk::fileTag::PIECE)
+            .xmlAttr(vtk::fileAttr::NUMBER_OF_POINTS, pp_.nPoints())
+            .xmlAttr(vtk::fileAttr::NUMBER_OF_POLYS,  pp_.size())
             .closeTag();
     }
 }
 
 
-void Foam::foamVtkOutput::surfaceMeshWriter::writePoints()
+void Foam::vtk::surfaceMeshWriter::writePoints()
 {
-    // payload count
     const uint64_t payLoad = (pp_.nPoints()*3*sizeof(float));
 
     if (legacy_)
@@ -53,26 +52,26 @@ void Foam::foamVtkOutput::surfaceMeshWriter::writePoints()
     }
     else
     {
-        format().tag(vtkFileTag::POINTS)
-            .openDataArray<float, 3>(vtkFileTag::POINTS)
+        format().tag(vtk::fileTag::POINTS)
+            .openDataArray<float, 3>(vtk::dataArrayAttr::POINTS)
             .closeTag();
     }
 
     format().writeSize(payLoad);
 
-    foamVtkOutput::writeList(format(), pp_.localPoints());
+    vtk::writeList(format(), pp_.localPoints());
     format().flush();
 
     if (!legacy_)
     {
         format()
             .endDataArray()
-            .endTag(vtkFileTag::POINTS);
+            .endTag(vtk::fileTag::POINTS);
     }
 }
 
 
-void Foam::foamVtkOutput::surfaceMeshWriter::writePolysLegacy()
+void Foam::vtk::surfaceMeshWriter::writePolysLegacy()
 {
     // connectivity count without additional storage (done internally)
     uint64_t nConnectivity = 0;
@@ -92,20 +91,20 @@ void Foam::foamVtkOutput::surfaceMeshWriter::writePolysLegacy()
         const face& f = pp_.localFaces()[facei];
 
         format().write(f.size());  // The size prefix
-        foamVtkOutput::writeList(format(), f);
+        vtk::writeList(format(), f);
     }
 
     format().flush();
 }
 
 
-void Foam::foamVtkOutput::surfaceMeshWriter::writePolys()
+void Foam::vtk::surfaceMeshWriter::writePolys()
 {
     //
     // 'connectivity'
     //
 
-    format().tag(vtkFileTag::POLYS);
+    format().tag(vtk::fileTag::POLYS);
 
     //
     // 'connectivity'
@@ -118,7 +117,7 @@ void Foam::foamVtkOutput::surfaceMeshWriter::writePolys()
             payLoad += pp_[facei].size();
         }
 
-        format().openDataArray<label>("connectivity")
+        format().openDataArray<label>(vtk::dataArrayAttr::CONNECTIVITY)
             .closeTag();
 
         // payload size
@@ -127,7 +126,7 @@ void Foam::foamVtkOutput::surfaceMeshWriter::writePolys()
         forAll(pp_, facei)
         {
             const face& f = pp_.localFaces()[facei];
-            foamVtkOutput::writeList(format(), f);
+            vtk::writeList(format(), f);
         }
 
         format().flush();
@@ -142,7 +141,7 @@ void Foam::foamVtkOutput::surfaceMeshWriter::writePolys()
     //
     {
         format()
-            .openDataArray<label>("offsets")
+            .openDataArray<label>(vtk::dataArrayAttr::OFFSETS)
             .closeTag();
 
         // payload size
@@ -160,11 +159,11 @@ void Foam::foamVtkOutput::surfaceMeshWriter::writePolys()
         format().endDataArray();
     }
 
-    format().endTag(vtkFileTag::POLYS);
+    format().endTag(vtk::fileTag::POLYS);
 }
 
 
-void Foam::foamVtkOutput::surfaceMeshWriter::writeMesh()
+void Foam::vtk::surfaceMeshWriter::writeMesh()
 {
     writePoints();
     if (legacy_)
@@ -180,12 +179,12 @@ void Foam::foamVtkOutput::surfaceMeshWriter::writeMesh()
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::surfaceMeshWriter::surfaceMeshWriter
+Foam::vtk::surfaceMeshWriter::surfaceMeshWriter
 (
     const indirectPrimitivePatch& pp,
     const word& name,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts
+    const vtk::outputOptions outOpts
 )
 :
     pp_(pp),
@@ -201,7 +200,7 @@ Foam::foamVtkOutput::surfaceMeshWriter::surfaceMeshWriter
 
     if (legacy_)
     {
-        legacy::fileHeader(format(), name, vtkFileTag::POLY_DATA);
+        legacy::fileHeader(format(), name, vtk::fileTag::POLY_DATA);
     }
     else
     {
@@ -210,7 +209,7 @@ Foam::foamVtkOutput::surfaceMeshWriter::surfaceMeshWriter
         format()
             .xmlHeader()
             .xmlComment(name)
-            .beginVTKFile(vtkFileTag::POLY_DATA, "0.1");
+            .beginVTKFile(vtk::fileTag::POLY_DATA, "0.1");
 
     }
 
@@ -221,42 +220,42 @@ Foam::foamVtkOutput::surfaceMeshWriter::surfaceMeshWriter
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::surfaceMeshWriter::~surfaceMeshWriter()
+Foam::vtk::surfaceMeshWriter::~surfaceMeshWriter()
 {}
 
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::surfaceMeshWriter::beginCellData(label nFields)
+void Foam::vtk::surfaceMeshWriter::beginCellData(label nFields)
 {
     if (legacy_)
     {
-        legacy::dataHeader(os(), vtkFileTag::CELL_DATA, pp_.size(), nFields);
+        legacy::dataHeader(os(), vtk::fileTag::CELL_DATA, pp_.size(), nFields);
     }
     else
     {
-        format().tag(vtkFileTag::CELL_DATA);
+        format().tag(vtk::fileTag::CELL_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::surfaceMeshWriter::endCellData()
+void Foam::vtk::surfaceMeshWriter::endCellData()
 {
     if (!legacy_)
     {
-        format().endTag(vtkFileTag::CELL_DATA);
+        format().endTag(vtk::fileTag::CELL_DATA);
     }
 }
 
 
-void Foam::foamVtkOutput::surfaceMeshWriter::writeFooter()
+void Foam::vtk::surfaceMeshWriter::writeFooter()
 {
     if (!legacy_)
     {
         // slight cheat. </Piece> too
-        format().endTag(vtkFileTag::PIECE);
+        format().endTag(vtk::fileTag::PIECE);
 
-        format().endTag(vtkFileTag::POLY_DATA)
+        format().endTag(vtk::fileTag::POLY_DATA)
             .endVTKFile();
     }
 }
diff --git a/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.H b/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.H
index d911998dec..9b174a0dec 100644
--- a/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.H
+++ b/src/conversion/vtk/output/foamVtkSurfaceMeshWriter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::surfaceMeshWriter
+    Foam::vtk::surfaceMeshWriter
 
 Description
     Write faces with fields
@@ -49,7 +49,7 @@ namespace Foam
 {
 class volPointInterpolation;
 
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -65,7 +65,7 @@ class surfaceMeshWriter
         //- Commonly used query
         const bool legacy_;
 
-        autoPtr<foamVtkOutput::formatter> format_;
+        autoPtr<vtk::formatter> format_;
 
         std::ofstream os_;
 
@@ -104,7 +104,7 @@ public:
             const indirectPrimitivePatch& pp,
             const word& name,
             const fileName& baseName,
-            const foamVtkOutput::outputOptions outOpts
+            const vtk::outputOptions outOpts
         );
 
 
@@ -119,7 +119,7 @@ public:
             return os_;
         }
 
-        inline foamVtkOutput::formatter& format()
+        inline vtk::formatter& format()
         {
             return format_();
         }
@@ -156,7 +156,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/conversion/vtk/output/foamVtkSurfaceMeshWriterTemplates.C b/src/conversion/vtk/output/foamVtkSurfaceMeshWriterTemplates.C
index 654475aa71..cdad74b7d0 100644
--- a/src/conversion/vtk/output/foamVtkSurfaceMeshWriterTemplates.C
+++ b/src/conversion/vtk/output/foamVtkSurfaceMeshWriterTemplates.C
@@ -29,7 +29,7 @@ License
 
 template<class Type>
 Foam::tmp<Foam::Field<Type>>
-Foam::foamVtkOutput::surfaceMeshWriter::getFaceField
+Foam::vtk::surfaceMeshWriter::getFaceField
 (
     const GeometricField<Type, fvsPatchField, surfaceMesh>& sfld
 ) const
@@ -60,7 +60,7 @@ Foam::foamVtkOutput::surfaceMeshWriter::getFaceField
 
 
 template<class Type>
-void Foam::foamVtkOutput::surfaceMeshWriter::write
+void Foam::vtk::surfaceMeshWriter::write
 (
     const UPtrList
     <
@@ -86,7 +86,7 @@ void Foam::foamVtkOutput::surfaceMeshWriter::write
         }
 
         format().writeSize(payLoad);
-        foamVtkOutput::writeList(format(), getFaceField(fld)());
+        vtk::writeList(format(), getFaceField(fld)());
 
         format().flush();
 
diff --git a/src/conversion/vtk/output/foamVtkWriteSurfFields.C b/src/conversion/vtk/output/foamVtkWriteSurfFields.C
index 9bc09e4864..40c99456a1 100644
--- a/src/conversion/vtk/output/foamVtkWriteSurfFields.C
+++ b/src/conversion/vtk/output/foamVtkWriteSurfFields.C
@@ -32,11 +32,11 @@ License
 
 // * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::writeSurfFields
+void Foam::vtk::writeSurfFields
 (
     const fvMesh& mesh,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts,
+    const vtk::outputOptions outOpts,
     const UPtrList<const surfaceVectorField>& surfVectorFields
 )
 {
@@ -46,7 +46,7 @@ void Foam::foamVtkOutput::writeSurfFields
     const bool legacy_(opts.legacy());
 
     std::ofstream os((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
-    autoPtr<foamVtkOutput::formatter> format = opts.newFormatter(os);
+    autoPtr<vtk::formatter> format = opts.newFormatter(os);
 
     // Same payload size for points and vector fields!
     const int nCmpt(3);  // vector
@@ -54,7 +54,7 @@ void Foam::foamVtkOutput::writeSurfFields
 
     if (legacy_)
     {
-        legacy::fileHeader(format(), "surfaceFields", vtkFileTag::POLY_DATA);
+        legacy::fileHeader(format(), "surfaceFields", vtk::fileTag::POLY_DATA);
         legacy::beginPoints(os, mesh.nFaces());
     }
     else
@@ -64,30 +64,30 @@ void Foam::foamVtkOutput::writeSurfFields
         format()
             .xmlHeader()
             .xmlComment("surfaceFields")
-            .beginVTKFile(vtkFileTag::POLY_DATA, "0.1");
+            .beginVTKFile(vtk::fileTag::POLY_DATA, "0.1");
 
         // Tricky - hide in beginPiece()
         format()
-            .openTag(vtkFileTag::PIECE)
-            ( "NumberOfPoints", mesh.nFaces() )
+            .openTag(vtk::fileTag::PIECE)
+            .xmlAttr(vtk::fileAttr::NUMBER_OF_POINTS, mesh.nFaces())
             .closeTag();
 
-        format().tag(vtkFileTag::POINTS)
-            .openDataArray<float,3>(vtkFileTag::POINTS)
+        format().tag(vtk::fileTag::POINTS)
+            .openDataArray<float,3>(vtk::dataArrayAttr::POINTS)
             .closeTag();
     }
 
     const pointField& fc = mesh.faceCentres();
 
     format().writeSize(payLoad);
-    foamVtkOutput::writeList(format(), fc);
+    vtk::writeList(format(), fc);
     format().flush();
 
     if (!legacy_)
     {
         format()
             .endDataArray()
-            .endTag(vtkFileTag::POINTS);
+            .endTag(vtk::fileTag::POINTS);
     }
 
 
@@ -97,14 +97,14 @@ void Foam::foamVtkOutput::writeSurfFields
         legacy::dataHeader
         (
             os,
-            vtkFileTag::POINT_DATA,
+            vtk::fileTag::POINT_DATA,
             mesh.nFaces(),
             surfVectorFields.size()
         );
     }
     else
     {
-        format().tag(vtkFileTag::POINT_DATA);
+        format().tag(vtk::fileTag::POINT_DATA);
     }
 
     // surfVectorFields
@@ -126,7 +126,7 @@ void Foam::foamVtkOutput::writeSurfFields
 
         for (label facei=0; facei < mesh.nInternalFaces(); ++facei)
         {
-            foamVtkOutput::write(format(), fld[facei]);
+            vtk::write(format(), fld[facei]);
         }
 
         forAll(fld.boundaryField(), patchi)
@@ -139,12 +139,12 @@ void Foam::foamVtkOutput::writeSurfFields
                 // Note: loop over polypatch size, not fvpatch size.
                 forAll(pp.patch(), i)
                 {
-                    foamVtkOutput::write(format(), vector::zero);
+                    vtk::write(format(), vector::zero);
                 }
             }
             else
             {
-                foamVtkOutput::writeList(format(), pf);
+                vtk::writeList(format(), pf);
             }
         }
 
@@ -158,12 +158,12 @@ void Foam::foamVtkOutput::writeSurfFields
 
     if (!legacy_)
     {
-        format().endTag(vtkFileTag::POINT_DATA);
+        format().endTag(vtk::fileTag::POINT_DATA);
 
         // slight cheat. </Piece> too
-        format().endTag(vtkFileTag::PIECE);
+        format().endTag(vtk::fileTag::PIECE);
 
-        format().endTag(vtkFileTag::POLY_DATA)
+        format().endTag(vtk::fileTag::POLY_DATA)
             .endVTKFile();
     }
 }
diff --git a/src/conversion/vtk/output/foamVtkWriteSurfFields.H b/src/conversion/vtk/output/foamVtkWriteSurfFields.H
index 80727dec54..ff7e77b00f 100644
--- a/src/conversion/vtk/output/foamVtkWriteSurfFields.H
+++ b/src/conversion/vtk/output/foamVtkWriteSurfFields.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 InNamespace
-    Foam::foamVtkOutput
+    Foam::vtk
 
 Description
     Write surface fields as vectors
@@ -44,7 +44,7 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 //- Write surface vector fields
@@ -52,11 +52,11 @@ void writeSurfFields
 (
     const fvMesh& mesh,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts,
+    const vtk::outputOptions outOpts,
     const UPtrList<const surfaceVectorField>& surfVectorFields
 );
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 
diff --git a/src/conversion/vtk/part/foamVtkMeshMaps.H b/src/conversion/vtk/part/foamVtkMeshMaps.H
index 63390ef34b..737f02a2ed 100644
--- a/src/conversion/vtk/part/foamVtkMeshMaps.H
+++ b/src/conversion/vtk/part/foamVtkMeshMaps.H
@@ -26,6 +26,8 @@ Class
 
 Description
     Bookkeeping for mesh subsetting and/or polyhedral cell decomposition.
+    Although the main use case is for handling vtk meshes, it is not specific
+    to VTK alone.
 
     The cellMap is a local-to-global lookup for normal and decomposed cells.
     The pointMap is an optional local-to-global lookup for point ids.
@@ -101,17 +103,19 @@ public:
         //- Clear
         inline void clear();
 
-        //- Renumber cell ids to account for subset meshes
+        //- Renumber cell ids (cellMap and additionalIds) to account for
+        //  subset meshes
         void renumberCells(const UList<label>& mapping);
 
-        //- Renumber point ids to account for subset meshes
+        //- Renumber point ids (pointMap) to account for subset meshes
         void renumberPoints(const UList<label>& mapping);
 
 
         //- Original cell ids for all cells (regular and decomposed).
-        //  A regular mesh comprising only primitive cell types, this will just
-        //  be an identity list. However, for subsetted meshes and decomposed
-        //  cells this becomes a useful means of mapping from the original mesh.
+        //  For a regular mesh comprising only primitive cell types, this
+        //  will simply be an identity list. However, for subsetted meshes
+        //  and decomposed cells this becomes a useful means of mapping from
+        //  the original mesh.
         inline DynamicList<label>& cellMap();
 
         //- Point labels for subsetted meshes
diff --git a/src/conversion/vtk/part/foamVtkCells.C b/src/conversion/vtk/part/foamVtuCells.C
similarity index 77%
rename from src/conversion/vtk/part/foamVtkCells.C
rename to src/conversion/vtk/part/foamVtuCells.C
index 8b9faf7142..962fa9b0ee 100644
--- a/src/conversion/vtk/part/foamVtkCells.C
+++ b/src/conversion/vtk/part/foamVtuCells.C
@@ -24,18 +24,18 @@ License
 \*---------------------------------------------------------------------------*/
 
 #include "polyMesh.H"
-#include "foamVtkCells.H"
+#include "foamVtuCells.H"
 #include "foamVtkOutputOptions.H"
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkCells::foamVtkCells
+Foam::vtk::vtuCells::vtuCells
 (
     const contentType output,
     const bool decompose
 )
 :
-    foamVtuSizing(),
+    vtk::vtuSizing(),
     output_(output),
     decomposeRequest_(decompose),
     cellTypes_(),
@@ -47,26 +47,26 @@ Foam::foamVtkCells::foamVtkCells
 {}
 
 
-Foam::foamVtkCells::foamVtkCells
+Foam::vtk::vtuCells::vtuCells
 (
     const polyMesh& mesh,
     const contentType output,
     const bool decompose
 )
 :
-    foamVtkCells(output, decompose)
+    vtuCells(output, decompose)
 {
     reset(mesh);
 }
 
 
-Foam::foamVtkCells::foamVtkCells
+Foam::vtk::vtuCells::vtuCells
 (
-    const foamVtkOutput::outputOptions outOpts,
+    const vtk::outputOptions outOpts,
     const bool decompose
 )
 :
-    foamVtkCells
+    vtuCells
     (
         (outOpts.legacy() ? contentType::LEGACY : contentType::XML),
         decompose
@@ -74,14 +74,14 @@ Foam::foamVtkCells::foamVtkCells
 {}
 
 
-Foam::foamVtkCells::foamVtkCells
+Foam::vtk::vtuCells::vtuCells
 (
     const polyMesh& mesh,
-    const foamVtkOutput::outputOptions outOpts,
+    const vtk::outputOptions outOpts,
     const bool decompose
 )
 :
-    foamVtkCells(outOpts, decompose)
+    vtuCells(outOpts, decompose)
 {
     reset(mesh);
 }
@@ -89,15 +89,15 @@ Foam::foamVtkCells::foamVtkCells
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkCells::~foamVtkCells()
+Foam::vtk::vtuCells::~vtuCells()
 {}
 
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtkCells::clear()
+void Foam::vtk::vtuCells::clear()
 {
-    foamVtuSizing::clear();
+    vtuSizing::clear();
     cellTypes_.clear();
     vertLabels_.clear();
     vertOffset_.clear();
@@ -108,15 +108,15 @@ void Foam::foamVtkCells::clear()
 }
 
 
-void Foam::foamVtkCells::reset(const polyMesh& mesh)
+void Foam::vtk::vtuCells::reset(const polyMesh& mesh)
 {
-    foamVtuSizing::reset(mesh, decomposeRequest_);
+    vtuSizing::reset(mesh, decomposeRequest_);
 
     cellTypes_.setSize(nFieldCells());
-    vertLabels_.setSize(slotSize(output_, slotType::CELLS));
-    vertOffset_.setSize(slotSize(output_, slotType::CELLS_OFFSETS));
-    faceLabels_.setSize(slotSize(output_, slotType::FACES));
-    faceOffset_.setSize(slotSize(output_, slotType::FACES_OFFSETS));
+    vertLabels_.setSize(sizeOf(output_, slotType::CELLS));
+    vertOffset_.setSize(sizeOf(output_, slotType::CELLS_OFFSETS));
+    faceLabels_.setSize(sizeOf(output_, slotType::FACES));
+    faceOffset_.setSize(sizeOf(output_, slotType::FACES_OFFSETS));
 
     switch (output_)
     {
@@ -157,7 +157,7 @@ void Foam::foamVtkCells::reset(const polyMesh& mesh)
 }
 
 
-void Foam::foamVtkCells::reset
+void Foam::vtk::vtuCells::reset
 (
     const polyMesh& mesh,
     const enum contentType output,
@@ -171,13 +171,13 @@ void Foam::foamVtkCells::reset
 }
 
 
-void Foam::foamVtkCells::renumberCells(const UList<label>& mapping)
+void Foam::vtk::vtuCells::renumberCells(const UList<label>& mapping)
 {
     maps_.renumberCells(mapping);
 }
 
 
-void Foam::foamVtkCells::renumberPoints(const UList<label>& mapping)
+void Foam::vtk::vtuCells::renumberPoints(const UList<label>& mapping)
 {
     maps_.renumberPoints(mapping);
 }
diff --git a/src/conversion/vtk/part/foamVtkCells.H b/src/conversion/vtk/part/foamVtuCells.H
similarity index 90%
rename from src/conversion/vtk/part/foamVtkCells.H
rename to src/conversion/vtk/part/foamVtuCells.H
index 5ad70cda51..6c4c71c524 100644
--- a/src/conversion/vtk/part/foamVtkCells.H
+++ b/src/conversion/vtk/part/foamVtuCells.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkCells
+    Foam::vtk::vtuCells
 
 Description
     A deep-copy description of an OpenFOAM volume mesh in data structures
@@ -36,20 +36,20 @@ Description
     related to the xml format, but not entirely.
 
 SeeAlso
-    Foam::foamVtuSizing
+    Foam::vtk::vtuSizing
 
 SourceFiles
-    foamVtkCells.C
-    foamVtkCellsI.H
+    foamVtuCells.C
+    foamVtuCellsI.H
 
 \*---------------------------------------------------------------------------*/
 
-#ifndef foamVtkCells_H
-#define foamVtkCells_H
+#ifndef foamVtuCells_H
+#define foamVtuCells_H
 
+#include "foamVtkCore.H"
 #include "foamVtkMeshMaps.H"
 #include "foamVtuSizing.H"
-#include "foamVtkCore.H"
 #include "DynamicList.H"
 #include "labelList.H"
 
@@ -61,22 +61,20 @@ namespace Foam
 // Forward declaration of classes
 class polyMesh;
 
-namespace foamVtkOutput
+namespace vtk
 {
+// Forward declaration of classes
     class outputOptions;
-}
-
 
 /*---------------------------------------------------------------------------*\
-                        Class foamVtkCells Declaration
+                     Class Foam::vtk::vtuCells Declaration
 \*---------------------------------------------------------------------------*/
 
-class foamVtkCells
+class vtuCells
 :
-    public fileFormats::foamVtkCore,
-    public foamVtuSizing
+    public vtuSizing
 {
-    // Private data
+    // Private Member Data
 
       // Requested output types
 
@@ -111,10 +109,10 @@ class foamVtkCells
     // Private Member Functions
 
         //- Disallow default bitwise copy construct
-        foamVtkCells(const foamVtkCells&) = delete;
+        vtuCells(const vtuCells&) = delete;
 
         //- Disallow default bitwise assignment
-        void operator=(const foamVtkCells&) = delete;
+        void operator=(const vtuCells&) = delete;
 
 
 public:
@@ -123,7 +121,7 @@ public:
 
         //- Construct from components.
         //  Optionally with polyhedral decomposition.
-        foamVtkCells
+        vtuCells
         (
             const enum contentType output = contentType::XML,
             const bool decompose = false
@@ -131,7 +129,7 @@ public:
 
         //- Construct from components and create the output information
         //  immediately
-        foamVtkCells
+        vtuCells
         (
             const polyMesh& mesh,
             const enum contentType output = contentType::XML,
@@ -140,24 +138,24 @@ public:
 
         //- Construct from components.
         //  Optionally with polyhedral decomposition.
-        foamVtkCells
+        vtuCells
         (
-            const foamVtkOutput::outputOptions outOpts,
+            const vtk::outputOptions outOpts,
             const bool decompose = false
         );
 
         //- Construct from components and create the output information
         //  immediately
-        foamVtkCells
+        vtuCells
         (
             const polyMesh& mesh,
-            const foamVtkOutput::outputOptions outOpts,
+            const vtk::outputOptions outOpts,
             const bool decompose = false
         );
 
 
     //- Destructor
-    ~foamVtkCells();
+    ~vtuCells();
 
 
     // Member Functions
@@ -230,11 +228,12 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-#include "foamVtkCellsI.H"
+#include "foamVtuCellsI.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
diff --git a/src/conversion/vtk/part/foamVtkCellsI.H b/src/conversion/vtk/part/foamVtuCellsI.H
similarity index 77%
rename from src/conversion/vtk/part/foamVtkCellsI.H
rename to src/conversion/vtk/part/foamVtuCellsI.H
index abf935fc80..49cbe18717 100644
--- a/src/conversion/vtk/part/foamVtkCellsI.H
+++ b/src/conversion/vtk/part/foamVtuCellsI.H
@@ -23,79 +23,80 @@ License
 
 \*---------------------------------------------------------------------------*/
 
-#include "foamVtkCells.H"
+#include "foamVtuCells.H"
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 
-inline enum Foam::foamVtkCells::contentType Foam::foamVtkCells::content() const
+inline enum Foam::vtk::vtuCells::contentType
+Foam::vtk::vtuCells::content() const
 {
     return output_;
 }
 
 
-inline bool Foam::foamVtkCells::decomposeRequested() const
+inline bool Foam::vtk::vtuCells::decomposeRequested() const
 {
     return decomposeRequest_;
 }
 
 
-inline bool Foam::foamVtkCells::empty() const
+inline bool Foam::vtk::vtuCells::empty() const
 {
     return cellTypes_.empty();
 }
 
 
-inline Foam::label Foam::foamVtkCells::size() const
+inline Foam::label Foam::vtk::vtuCells::size() const
 {
     return cellTypes_.size();
 }
 
 
 inline const Foam::List<uint8_t>&
-Foam::foamVtkCells::cellTypes() const
+Foam::vtk::vtuCells::cellTypes() const
 {
     return cellTypes_;
 }
 
 
 inline const Foam::labelList&
-Foam::foamVtkCells::vertLabels() const
+Foam::vtk::vtuCells::vertLabels() const
 {
     return vertLabels_;
 }
 
 
 inline const Foam::labelList&
-Foam::foamVtkCells::vertOffsets() const
+Foam::vtk::vtuCells::vertOffsets() const
 {
     return vertOffset_;
 }
 
 
 inline const Foam::labelList&
-Foam::foamVtkCells::faceLabels() const
+Foam::vtk::vtuCells::faceLabels() const
 {
     return faceLabels_;
 }
 
 
 inline const Foam::labelList&
-Foam::foamVtkCells::faceOffsets() const
+Foam::vtk::vtuCells::faceOffsets() const
 {
     return faceOffset_;
 }
 
 
 inline const Foam::labelList&
-Foam::foamVtkCells::addPointCellLabels() const
+Foam::vtk::vtuCells::addPointCellLabels() const
 {
     return maps_.additionalIds();
 }
 
 
 inline const Foam::labelList&
-Foam::foamVtkCells::cellMap() const
+Foam::vtk::vtuCells::cellMap() const
 {
     return maps_.cellMap();
 }
diff --git a/src/conversion/vtk/part/foamVtuSizing.C b/src/conversion/vtk/part/foamVtuSizing.C
index a9f0451f02..15c4429380 100644
--- a/src/conversion/vtk/part/foamVtuSizing.C
+++ b/src/conversion/vtk/part/foamVtuSizing.C
@@ -29,12 +29,12 @@ License
 #include "cellShape.H"
 #include "cellModeller.H"
 
-// only used in this file
+// Only used in this file
 #include "foamVtuSizingTemplates.C"
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-void Foam::foamVtuSizing::presizeMaps(foamVtkMeshMaps& maps) const
+void Foam::vtk::vtuSizing::presizeMaps(foamVtkMeshMaps& maps) const
 {
     maps.cellMap().setSize(this->nFieldCells());
     maps.additionalIds().setSize(this->nAddPoints());
@@ -43,7 +43,7 @@ void Foam::foamVtuSizing::presizeMaps(foamVtkMeshMaps& maps) const
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtuSizing::foamVtuSizing
+Foam::vtk::vtuSizing::vtuSizing
 (
     const polyMesh& mesh,
     const bool decompose
@@ -54,7 +54,7 @@ Foam::foamVtuSizing::foamVtuSizing
 }
 
 
-Foam::foamVtuSizing::foamVtuSizing()
+Foam::vtk::vtuSizing::vtuSizing()
 {
     clear();
 }
@@ -62,13 +62,13 @@ Foam::foamVtuSizing::foamVtuSizing()
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtuSizing::~foamVtuSizing()
+Foam::vtk::vtuSizing::~vtuSizing()
 {}
 
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtuSizing::reset
+void Foam::vtk::vtuSizing::reset
 (
     const polyMesh& mesh,
     const bool decompose
@@ -160,7 +160,7 @@ void Foam::foamVtuSizing::reset
 
             const labelList& cFaces = mesh.cells()[celli];
 
-            // Unique node ids used (only needed for XML)
+            // Unique node ids used (XML/INTERNAL, not needed for LEGACY)
             hashUniqId.clear();
 
             // Face stream sizing:
@@ -189,7 +189,7 @@ void Foam::foamVtuSizing::reset
 }
 
 
-Foam::label Foam::foamVtuSizing::slotSize
+Foam::label Foam::vtk::vtuSizing::sizeOf
 (
     const enum contentType output,
     const enum slotType slot
@@ -269,7 +269,7 @@ Foam::label Foam::foamVtuSizing::slotSize
 }
 
 
-void Foam::foamVtuSizing::populateLegacy
+void Foam::vtk::vtuSizing::populateLegacy
 (
     const polyMesh& mesh,
     UList<uint8_t>& cellTypes,
@@ -298,7 +298,7 @@ void Foam::foamVtuSizing::populateLegacy
 }
 
 
-void Foam::foamVtuSizing::populateXml
+void Foam::vtk::vtuSizing::populateXml
 (
     const polyMesh& mesh,
     UList<uint8_t>& cellTypes,
@@ -327,7 +327,7 @@ void Foam::foamVtuSizing::populateXml
 }
 
 
-void Foam::foamVtuSizing::populateInternal
+void Foam::vtk::vtuSizing::populateInternal
 (
     const polyMesh& mesh,
     UList<uint8_t>& cellTypes,
@@ -356,7 +356,7 @@ void Foam::foamVtuSizing::populateInternal
 }
 
 
-void Foam::foamVtuSizing::populateInternal
+void Foam::vtk::vtuSizing::populateInternal
 (
     const polyMesh& mesh,
     UList<uint8_t>& cellTypes,
@@ -385,7 +385,7 @@ void Foam::foamVtuSizing::populateInternal
 }
 
 
-void Foam::foamVtuSizing::populateInternal
+void Foam::vtk::vtuSizing::populateInternal
 (
     const polyMesh& mesh,
     UList<uint8_t>& cellTypes,
@@ -414,7 +414,7 @@ void Foam::foamVtuSizing::populateInternal
 }
 
 
-void Foam::foamVtuSizing::populateInternal
+void Foam::vtk::vtuSizing::populateInternal
 (
     const polyMesh& mesh,
     UList<uint8_t>& cellTypes,
@@ -442,7 +442,7 @@ void Foam::foamVtuSizing::populateInternal
 }
 
 
-void Foam::foamVtuSizing::populateInternal
+void Foam::vtk::vtuSizing::populateInternal
 (
     const polyMesh& mesh,
     UList<uint8_t>& cellTypes,
@@ -470,7 +470,7 @@ void Foam::foamVtuSizing::populateInternal
 }
 
 
-void Foam::foamVtuSizing::populateInternal
+void Foam::vtk::vtuSizing::populateInternal
 (
     const polyMesh& mesh,
     UList<uint8_t>& cellTypes,
@@ -498,7 +498,7 @@ void Foam::foamVtuSizing::populateInternal
 }
 
 
-void Foam::foamVtuSizing::clear()
+void Foam::vtk::vtuSizing::clear()
 {
     decompose_   = false;
     nCells_      = 0;
@@ -515,7 +515,7 @@ void Foam::foamVtuSizing::clear()
 }
 
 
-void Foam::foamVtuSizing::info(Ostream& os) const
+void Foam::vtk::vtuSizing::info(Ostream& os) const
 {
     os  << "nFieldCells:" << nFieldCells();
     if (nAddCells_)
@@ -551,7 +551,7 @@ void Foam::foamVtuSizing::info(Ostream& os) const
 
 // * * * * * * * * * * * * * * * Member Operators  * * * * * * * * * * * * * //
 
-bool Foam::foamVtuSizing::operator==(const foamVtuSizing& rhs) const
+bool Foam::vtk::vtuSizing::operator==(const vtuSizing& rhs) const
 {
     return
     (
@@ -569,7 +569,7 @@ bool Foam::foamVtuSizing::operator==(const foamVtuSizing& rhs) const
 }
 
 
-bool Foam::foamVtuSizing::operator!=(const foamVtuSizing& rhs) const
+bool Foam::vtk::vtuSizing::operator!=(const vtuSizing& rhs) const
 {
     return !operator==(rhs);
 }
diff --git a/src/conversion/vtk/part/foamVtuSizing.H b/src/conversion/vtk/part/foamVtuSizing.H
index a5b1d98be6..a14209807a 100644
--- a/src/conversion/vtk/part/foamVtuSizing.H
+++ b/src/conversion/vtk/part/foamVtuSizing.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtuSizing
+    Foam::vtk::vtuSizing
 
 Description
     Sizing descriptions and routines for transcribing an OpenFOAM volume mesh
@@ -97,32 +97,36 @@ namespace Foam
 // Forward declaration of classes
 class polyMesh;
 
+namespace vtk
+{
+
 /*---------------------------------------------------------------------------*\
-                        Class foamVtuSizing Declaration
+                    Class Foam::vtk::vtuSizing Declaration
 \*---------------------------------------------------------------------------*/
 
-class foamVtuSizing
+class vtuSizing
 {
 public:
 
     // Public data
 
-        //- Types of content that the storage may represent
-        enum contentType
-        {
-            LEGACY,     //!< Legacy VTK content
-            XML,        //!< XML (VTU) content
-            INTERNAL    //!< Internal vtkUnstructuredGrid content
-        };
+    //- Types of content that the storage may represent
+    enum contentType
+    {
+        LEGACY,     //!< Legacy VTK content
+        XML,        //!< XML (VTU) content
+        INTERNAL    //!< Internal vtkUnstructuredGrid content
+    };
+
+    //- The possible storage 'slots' that can be used
+    enum slotType
+    {
+        CELLS,         //!< Cell connectivity (ALL)
+        CELLS_OFFSETS, //!< End-offsets (XML) or locations (INTERNAL) for cells
+        FACES,         //!< Face-stream (XML, INTERNAL)
+        FACES_OFFSETS  //!< End-offsets (XML) or locations (INTERNAL) for faces
+    };
 
-        //- The storage 'slots' required
-        enum slotType
-        {
-            CELLS,         //!< Cell connectivity (ALL)
-            CELLS_OFFSETS, //!< Begin (XML) or end (INTERNAL) offsets into cells
-            FACES,         //!< Face-stream (XML, INTERNAL)
-            FACES_OFFSETS  //!< Begin (XML) or end (INTERNAL) offsets into faces
-        };
 
 private:
 
@@ -173,7 +177,7 @@ private:
         static void populateArrays
         (
             const polyMesh& mesh,
-            const foamVtuSizing& sizing,
+            const vtk::vtuSizing& sizing,
             UList<uint8_t>& cellTypes,
             UList<LabelType>& vertLabels,
             UList<LabelType>& vertOffset,
@@ -191,15 +195,15 @@ public:
     // Constructors
 
         //- Construct null.
-        foamVtuSizing();
+        vtuSizing();
 
         //- Construct sizes by analyzing the mesh,
         //  optionally with polyhedral decomposition.
-        foamVtuSizing(const polyMesh& mesh, const bool decompose=false);
+        vtuSizing(const polyMesh& mesh, const bool decompose=false);
 
 
     //- Destructor
-    ~foamVtuSizing();
+    ~vtuSizing();
 
 
     // Member Functions
@@ -257,7 +261,7 @@ public:
       // Derived sizes
 
         //- Return the required size for the storage slot
-        label slotSize
+        label sizeOf
         (
             const enum contentType output,
             const enum slotType slot
@@ -385,16 +389,17 @@ public:
       // Member Operators
 
         //- Test equality
-        bool operator==(const foamVtuSizing& rhs) const;
+        bool operator==(const vtuSizing& rhs) const;
 
         //- Test inequality
-        bool operator!=(const foamVtuSizing& rhs) const;
+        bool operator!=(const vtuSizing& rhs) const;
 
 };
 
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/conversion/vtk/part/foamVtuSizingI.H b/src/conversion/vtk/part/foamVtuSizingI.H
index 25bee49abc..6777ce7e7a 100644
--- a/src/conversion/vtk/part/foamVtuSizingI.H
+++ b/src/conversion/vtk/part/foamVtuSizingI.H
@@ -27,108 +27,108 @@ License
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-inline bool Foam::foamVtuSizing::decompose() const
+inline bool Foam::vtk::vtuSizing::decompose() const
 {
     return decompose_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nCells() const
+inline Foam::label Foam::vtk::vtuSizing::nCells() const
 {
     return nCells_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nPoints() const
+inline Foam::label Foam::vtk::vtuSizing::nPoints() const
 {
     return nPoints_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nVertLabels() const
+inline Foam::label Foam::vtk::vtuSizing::nVertLabels() const
 {
     return nVertLabels_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nFaceLabels() const
+inline Foam::label Foam::vtk::vtuSizing::nFaceLabels() const
 {
     return nFaceLabels_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nCellsPoly() const
+inline Foam::label Foam::vtk::vtuSizing::nCellsPoly() const
 {
     return nCellsPoly_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nVertPoly() const
+inline Foam::label Foam::vtk::vtuSizing::nVertPoly() const
 {
     return nVertPoly_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nAddCells() const
+inline Foam::label Foam::vtk::vtuSizing::nAddCells() const
 {
     return nAddCells_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nAddPoints() const
+inline Foam::label Foam::vtk::vtuSizing::nAddPoints() const
 {
     return nAddPoints_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nAddVerts() const
+inline Foam::label Foam::vtk::vtuSizing::nAddVerts() const
 {
     return nAddVerts_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nFieldCells() const
+inline Foam::label Foam::vtk::vtuSizing::nFieldCells() const
 {
     return nCells_ + nAddCells_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::nFieldPoints() const
+inline Foam::label Foam::vtk::vtuSizing::nFieldPoints() const
 {
     return nPoints_ + nAddPoints_;
 }
 
 
-inline Foam::label Foam::foamVtuSizing::sizeLegacy() const
+inline Foam::label Foam::vtk::vtuSizing::sizeLegacy() const
 {
-    return slotSize(contentType::LEGACY, slotType::CELLS);
+    return sizeOf(contentType::LEGACY, slotType::CELLS);
 }
 
 
-inline Foam::label Foam::foamVtuSizing::sizeLegacy
+inline Foam::label Foam::vtk::vtuSizing::sizeLegacy
 (
     const enum slotType slot
 ) const
 {
-    return slotSize(contentType::LEGACY, slot);
+    return sizeOf(contentType::LEGACY, slot);
 }
 
 
-inline Foam::label Foam::foamVtuSizing::sizeXml
+inline Foam::label Foam::vtk::vtuSizing::sizeXml
 (
     const enum slotType slot
 ) const
 {
-    return slotSize(contentType::XML, slot);
+    return sizeOf(contentType::XML, slot);
 }
 
 
-inline Foam::label Foam::foamVtuSizing::sizeInternal
+inline Foam::label Foam::vtk::vtuSizing::sizeInternal
 (
     const enum slotType slot
 ) const
 {
-    return slotSize(contentType::INTERNAL, slot);
+    return sizeOf(contentType::INTERNAL, slot);
 }
 
 
diff --git a/src/conversion/vtk/part/foamVtuSizingTemplates.C b/src/conversion/vtk/part/foamVtuSizingTemplates.C
index a30f88de85..0c4ffe44ac 100644
--- a/src/conversion/vtk/part/foamVtuSizingTemplates.C
+++ b/src/conversion/vtk/part/foamVtuSizingTemplates.C
@@ -32,10 +32,10 @@ License
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
 template<class LabelType, class LabelType2>
-void Foam::foamVtuSizing::populateArrays
+void Foam::vtk::vtuSizing::populateArrays
 (
     const polyMesh& mesh,
-    const foamVtuSizing& sizing,
+    const vtk::vtuSizing& sizing,
     UList<uint8_t>& cellTypes,
     UList<LabelType>& vertLabels,
     UList<LabelType>& vertOffset,
@@ -46,8 +46,6 @@ void Foam::foamVtuSizing::populateArrays
     UList<LabelType2>& addPointsIds
 )
 {
-    using vtkTypes = fileFormats::foamVtkCore::vtkTypes;
-
     // STAGE 1: Verify storage sizes
 
     if (cellTypes.size() != sizing.nFieldCells())
@@ -275,7 +273,7 @@ void Foam::foamVtuSizing::populateArrays
 
         if (model == tet)
         {
-            cellTypes[celli] = vtkTypes::VTK_TETRA;
+            cellTypes[celli] = vtk::cellType::VTK_TETRA;
             if (vertOffset.size())
             {
                 vertOffset[celli] = shape.size();
@@ -292,7 +290,7 @@ void Foam::foamVtuSizing::populateArrays
         }
         else if (model == pyr)
         {
-            cellTypes[celli] = vtkTypes::VTK_PYRAMID;
+            cellTypes[celli] = vtk::cellType::VTK_PYRAMID;
             if (vertOffset.size())
             {
                 vertOffset[celli] = shape.size();
@@ -309,7 +307,7 @@ void Foam::foamVtuSizing::populateArrays
         }
         else if (model == hex)
         {
-            cellTypes[celli] = vtkTypes::VTK_HEXAHEDRON;
+            cellTypes[celli] = vtk::cellType::VTK_HEXAHEDRON;
             if (vertOffset.size())
             {
                 vertOffset[celli] = shape.size();
@@ -326,7 +324,7 @@ void Foam::foamVtuSizing::populateArrays
         }
         else if (model == prism)
         {
-            cellTypes[celli] = vtkTypes::VTK_WEDGE;
+            cellTypes[celli] = vtk::cellType::VTK_WEDGE;
             if (vertOffset.size())
             {
                 vertOffset[celli] = shape.size();
@@ -347,7 +345,7 @@ void Foam::foamVtuSizing::populateArrays
         else if (model == tetWedge && sizing.decompose())
         {
             // Treat as squeezed prism
-            cellTypes[celli] = vtkTypes::VTK_WEDGE;
+            cellTypes[celli] = vtk::cellType::VTK_WEDGE;
             if (vertOffset.size())
             {
                 vertOffset[celli] = 6;
@@ -367,7 +365,7 @@ void Foam::foamVtuSizing::populateArrays
         else if (model == wedge && sizing.decompose())
         {
             // Treat as squeezed hex
-            cellTypes[celli] = vtkTypes::VTK_HEXAHEDRON;
+            cellTypes[celli] = vtk::cellType::VTK_HEXAHEDRON;
             if (vertOffset.size())
             {
                 vertOffset[celli] = 8;
@@ -443,7 +441,7 @@ void Foam::foamVtuSizing::populateArrays
                     }
                     cellMap[celLoc] = celli;
 
-                    cellTypes[celLoc] = vtkTypes::VTK_PYRAMID;
+                    cellTypes[celLoc] = vtk::cellType::VTK_PYRAMID;
                     if (vertOffset.size())
                     {
                         vertOffset[celLoc] = nShapePoints;
@@ -494,7 +492,7 @@ void Foam::foamVtuSizing::populateArrays
                     }
                     cellMap[celLoc] = celli;
 
-                    cellTypes[celLoc] = vtkTypes::VTK_TETRA;
+                    cellTypes[celLoc] = vtk::cellType::VTK_TETRA;
                     if (vertOffset.size())
                     {
                         vertOffset[celLoc] = nShapePoints;
@@ -504,7 +502,7 @@ void Foam::foamVtuSizing::populateArrays
                         vertLabels[vrtLoc++] = nShapePoints;
                     }
 
-                    cellTypes[celLoc] = vtkTypes::VTK_TETRA;
+                    cellTypes[celLoc] = vtk::cellType::VTK_TETRA;
 
                     // See note above about the orientation.
                     if (isOwner)
@@ -530,7 +528,7 @@ void Foam::foamVtuSizing::populateArrays
 
             // face-stream
             //   [nFaces, nFace0Pts, id1, id2, ..., nFace1Pts, id1, id2, ...]
-            cellTypes[celli] = vtkTypes::VTK_POLYHEDRON;
+            cellTypes[celli] = vtk::cellType::VTK_POLYHEDRON;
             const labelList& cFaces = mesh.cells()[celli];
 
             const label startLabel = faceIndexer;
diff --git a/src/fileFormats/Make/files b/src/fileFormats/Make/files
index c2024986a3..1dd9b3469a 100644
--- a/src/fileFormats/Make/files
+++ b/src/fileFormats/Make/files
@@ -14,7 +14,8 @@ stl/STLCore.C
 stl/STLReader.C
 stl/STLReaderASCII.L
 
-vtk/foamVtkCore.C
+vtk/core/foamVtkCore.C
+vtk/core/foamVtkPTraits.C
 vtk/format/foamVtkFormatter.C
 vtk/format/foamVtkAsciiFormatter.C
 vtk/format/foamVtkBase64Formatter.C
@@ -26,8 +27,6 @@ vtk/format/foamVtkLegacyRawFormatter.C
 vtk/output/foamVtkOutput.C
 vtk/output/foamVtkOutputOptions.C
 vtk/read/vtkUnstructuredReader.C
-vtk/type/foamVtkFileEnums.C
-vtk/type/foamVtkPTraits.C
 
 coordSet/coordSet.C
 
diff --git a/src/fileFormats/vtk/core/foamVtkCore.C b/src/fileFormats/vtk/core/foamVtkCore.C
new file mode 100644
index 0000000000..be0cffa033
--- /dev/null
+++ b/src/fileFormats/vtk/core/foamVtkCore.C
@@ -0,0 +1,71 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+#include "foamVtkCore.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+const Foam::Enum<Foam::vtk::fileTag> Foam::vtk::fileTagNames
+{
+    { fileTag::VTK_FILE, "VTKFile" },
+    { fileTag::DATA_ARRAY, "DataArray" },
+    { fileTag::PIECE, "Piece" },
+    { fileTag::DATA_SET, "DataSet" },
+    { fileTag::POINTS, "Points" },
+    { fileTag::CELLS, "Cells" },
+    { fileTag::POLYS, "Polys" },
+    { fileTag::VERTS, "Verts" },
+    { fileTag::LINES, "Lines" },
+    { fileTag::CELL_DATA, "CellData" },
+    { fileTag::POINT_DATA, "PointData" },
+    { fileTag::POLY_DATA, "PolyData" },
+    { fileTag::UNSTRUCTURED_GRID, "UnstructuredGrid" },
+};
+
+
+const Foam::Enum<Foam::vtk::fileAttr> Foam::vtk::fileAttrNames
+{
+    { fileAttr::OFFSET, "offset" },
+    { fileAttr::NUMBER_OF_COMPONENTS, "NumberOfComponents" },
+    { fileAttr::NUMBER_OF_POINTS, "NumberOfPoints" },
+    { fileAttr::NUMBER_OF_CELLS, "NumberOfCells" },
+    { fileAttr::NUMBER_OF_POLYS, "NumberOfPolys" },
+    { fileAttr::NUMBER_OF_VERTS, "NumberOfVerts" },
+    { fileAttr::NUMBER_OF_LINES, "NumberOfLines" },
+};
+
+
+const Foam::Enum<Foam::vtk::dataArrayAttr> Foam::vtk::dataArrayAttrNames
+{
+    { dataArrayAttr::POINTS, "Points" },
+    { dataArrayAttr::OFFSETS, "offsets" },
+    { dataArrayAttr::CONNECTIVITY, "connectivity" },
+    { dataArrayAttr::TYPES, "types" },
+    { dataArrayAttr::FACES, "faces" },
+    { dataArrayAttr::FACEOFFSETS, "faceoffsets" },
+};
+
+
+// ************************************************************************* //
diff --git a/src/fileFormats/vtk/core/foamVtkCore.H b/src/fileFormats/vtk/core/foamVtkCore.H
new file mode 100644
index 0000000000..d209d60c93
--- /dev/null
+++ b/src/fileFormats/vtk/core/foamVtkCore.H
@@ -0,0 +1,163 @@
+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2016-2017 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+Namespace
+    Foam::vtk
+
+Description
+    Namespace for handling VTK input/output.
+
+SourceFiles
+    foamVtkCore.C
+
+\*---------------------------------------------------------------------------*/
+
+#ifndef foamVtkCore_H
+#define foamVtkCore_H
+
+#include "Enum.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+namespace Foam
+{
+namespace vtk
+{
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+  // Enumerations
+
+    //- The context when outputting a VTK file (XML or legacy).
+    enum OutputContext
+    {
+        INLINE,     //<! Generate header and inline data
+        HEADER,     //<! Generate header only
+        APPEND      //<! Generate append-data
+    };
+
+
+    //- The output format type for file contents.
+    //  Upper bits for output type, lower bits for the format itself.
+    enum class formatType
+    {
+        /** XML inline ASCII, using the asciiFormatter */
+        INLINE_ASCII  = 0,
+        /** XML inline base64, using the base64Formatter */
+        INLINE_BASE64 = 0x01,
+        /** XML append base64, using the appendBase64Formatter */
+        APPEND_BASE64 = 0x11,
+        /** XML append raw binary, using the appendRawFormatter */
+        APPEND_BINARY = 0x12,
+        /** Legacy ASCII, using the legacyAsciiFormatter */
+        LEGACY_ASCII  = 0x20,
+        /** Legacy raw binary, using the legacyRawFormatter */
+        LEGACY_BINARY = 0x22,
+    };
+
+    //- Equivalent to enumeration in "vtkCellType.h"
+    enum cellType
+    {
+        VTK_EMPTY_CELL       = 0,
+        VTK_VERTEX           = 1,
+        VTK_POLY_VERTEX      = 2,
+        VTK_LINE             = 3,
+        VTK_POLY_LINE        = 4,
+        VTK_TRIANGLE         = 5,
+        VTK_TRIANGLE_STRIP   = 6,
+        VTK_POLYGON          = 7,
+        VTK_PIXEL            = 8,
+        VTK_QUAD             = 9,
+        VTK_TETRA            = 10,
+        VTK_VOXEL            = 11,
+        VTK_HEXAHEDRON       = 12,
+        VTK_WEDGE            = 13,
+        VTK_PYRAMID          = 14,
+        VTK_PENTAGONAL_PRISM = 15,
+        VTK_HEXAGONAL_PRISM  = 16,
+        VTK_POLYHEDRON       = 42
+    };
+
+
+    //- Some common XML tags for vtk files
+    enum class fileTag
+    {
+        VTK_FILE,               //!< "VTKFile"
+        DATA_ARRAY,             //!< "DataArray"
+        PIECE,                  //!< "Piece"
+        DATA_SET,               //!< "DataSet"
+        POINTS,                 //!< "Points"
+        CELLS,                  //!< "Cells"
+        POLYS,                  //!< "Polys"
+        VERTS,                  //!< "Verts"
+        LINES,                  //!< "Lines"
+        CELL_DATA,              //!< "CellData"
+        POINT_DATA,             //!< "PointData"
+        POLY_DATA,              //!< "PolyData"
+        UNSTRUCTURED_GRID,      //!< "UnstructuredGrid"
+    };
+
+    //- Strings corresponding to the vtk xml tags
+    extern const Foam::Enum<fileTag> fileTagNames;
+
+    //- Some common XML attributes for vtk files
+    enum class fileAttr
+    {
+        OFFSET,                 //!< "offset"
+        NUMBER_OF_COMPONENTS,   //!< "NumberOfComponents"
+        NUMBER_OF_POINTS,       //!< "NumberOfPoints"
+        NUMBER_OF_CELLS,        //!< "NumberOfCells"
+        NUMBER_OF_POLYS,        //!< "NumberOfPolys"
+        NUMBER_OF_VERTS,        //!< "NumberOfVerts"
+        NUMBER_OF_LINES,        //!< "NumberOfLines"
+    };
+
+    //- Strings corresponding to the vtk xml attributes
+    extern const Foam::Enum<fileAttr> fileAttrNames;
+
+    //- Some common names for XML data arrays
+    enum class dataArrayAttr
+    {
+        POINTS,                 //!< "Points"
+        OFFSETS,                //!< "offsets"
+        CONNECTIVITY,           //!< "connectivity"
+        TYPES,                  //!< "types"
+        FACES,                  //!< "faces"
+        FACEOFFSETS,            //!< "faceoffsets"
+    };
+
+    //- Strings corresponding to the vtk xml attributes
+    extern const Foam::Enum<dataArrayAttr> dataArrayAttrNames;
+
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+} // End namespace vtk
+
+} // End namespace Foam
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+#endif
+
+// ************************************************************************* //
diff --git a/src/fileFormats/vtk/type/foamVtkPTraits.C b/src/fileFormats/vtk/core/foamVtkPTraits.C
similarity index 77%
rename from src/fileFormats/vtk/type/foamVtkPTraits.C
rename to src/fileFormats/vtk/core/foamVtkPTraits.C
index feb5e909c2..0cc5ca04e4 100644
--- a/src/fileFormats/vtk/type/foamVtkPTraits.C
+++ b/src/fileFormats/vtk/core/foamVtkPTraits.C
@@ -30,40 +30,40 @@ License
 
 template<>
 const char* const
-Foam::foamVtkPTraits<uint8_t>::typeName = "UInt8";
+Foam::vtkPTraits<uint8_t>::typeName = "UInt8";
 
 template<>
 const char * const
-Foam::foamVtkPTraits<int32_t>::typeName = "Int32";
+Foam::vtkPTraits<int32_t>::typeName = "Int32";
 
 template<>
 const char * const
-Foam::foamVtkPTraits<uint32_t>::typeName = "UInt32";
+Foam::vtkPTraits<uint32_t>::typeName = "UInt32";
 
 template<>
 const char * const
-Foam::foamVtkPTraits<int64_t>::typeName = "Int64";
+Foam::vtkPTraits<int64_t>::typeName = "Int64";
 
 template<>
 const char * const
-Foam::foamVtkPTraits<uint64_t>::typeName = "UInt64";
+Foam::vtkPTraits<uint64_t>::typeName = "UInt64";
 
 template<>
 const char * const
-Foam::foamVtkPTraits<float>::typeName = "Float32";
+Foam::vtkPTraits<float>::typeName = "Float32";
 
 template<>
 const char * const
-Foam::foamVtkPTraits<double>::typeName = "Float64";
+Foam::vtkPTraits<double>::typeName = "Float64";
 
 #ifdef WM_LITTLE_ENDIAN
 template<>
 const char* const
-Foam::foamVtkPTraits<Foam::endian>::typeName = "LittleEndian";
+Foam::vtkPTraits<Foam::endian>::typeName = "LittleEndian";
 #else
 template<>
 const char* const
-Foam::foamVtkPTraits<Foam::endian>::typeName = "BigEndian";
+Foam::vtkPTraits<Foam::endian>::typeName = "BigEndian";
 #endif
 
 
diff --git a/src/fileFormats/vtk/type/foamVtkPTraits.H b/src/fileFormats/vtk/core/foamVtkPTraits.H
similarity index 76%
rename from src/fileFormats/vtk/type/foamVtkPTraits.H
rename to src/fileFormats/vtk/core/foamVtkPTraits.H
index ff77c03b8d..ac8df06646 100644
--- a/src/fileFormats/vtk/type/foamVtkPTraits.H
+++ b/src/fileFormats/vtk/core/foamVtkPTraits.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkPTraits
+    Foam::vtkPTraits
 
 Description
     Names for VTK primitive types.
@@ -43,11 +43,11 @@ namespace Foam
 class endian;
 
 /*---------------------------------------------------------------------------*\
-                         Class foamVtkPTraits Declaration
+                         Class vtkPTraits Declaration
 \*---------------------------------------------------------------------------*/
 
 template<class PrimitiveType>
-class foamVtkPTraits
+class vtkPTraits
 {
 public:
 
@@ -58,28 +58,28 @@ public:
 
 
 template<>
-const char* const foamVtkPTraits<uint8_t>::typeName;  // UInt8
+const char* const vtkPTraits<uint8_t>::typeName;  // UInt8
 
 template<>
-const char* const foamVtkPTraits<int32_t>::typeName;  // Int32
+const char* const vtkPTraits<int32_t>::typeName;  // Int32
 
 template<>
-const char* const foamVtkPTraits<uint32_t>::typeName; // UInt32
+const char* const vtkPTraits<uint32_t>::typeName; // UInt32
 
 template<>
-const char* const foamVtkPTraits<int64_t>::typeName;  // Int64
+const char* const vtkPTraits<int64_t>::typeName;  // Int64
 
 template<>
-const char* const foamVtkPTraits<uint64_t>::typeName; // UInt64
+const char* const vtkPTraits<uint64_t>::typeName; // UInt64
 
 template<>
-const char* const foamVtkPTraits<float>::typeName;    // Float32
+const char* const vtkPTraits<float>::typeName;    // Float32
 
 template<>
-const char* const foamVtkPTraits<double>::typeName;   // Float64
+const char* const vtkPTraits<double>::typeName;   // Float64
 
 template<>
-const char* const foamVtkPTraits<Foam::endian>::typeName; // (Big|Little)Endian
+const char* const vtkPTraits<Foam::endian>::typeName; // (Big|Little)Endian
 
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/foamVtkCore.C b/src/fileFormats/vtk/foamVtkCore.C
deleted file mode 100644
index 2450c02b7b..0000000000
--- a/src/fileFormats/vtk/foamVtkCore.C
+++ /dev/null
@@ -1,54 +0,0 @@
-/*---------------------------------------------------------------------------*\
-  =========                 |
-  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
-   \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2016 OpenCFD Ltd.
-     \\/     M anipulation  |
--------------------------------------------------------------------------------
-License
-    This file is part of OpenFOAM.
-
-    OpenFOAM is free software: you can redistribute it and/or modify it
-    under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
-    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-    for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
-
-\*---------------------------------------------------------------------------*/
-
-#include "foamVtkCore.H"
-
-// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
-
-
-// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
-
-Foam::fileFormats::foamVtkCore::foamVtkCore()
-{}
-
-
-// * * * * * * * * * * *  Protected Member Functions * * * * * * * * * * * * //
-
-
-// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
-
-/*
-Foam::fileName Foam::fileFormats::foamVtkCore::vtkFileName
-(
-    const fileName& base,
-    const enum fileExt ext
-)
-{
-    return base + '.' + fileExtensions_[ext];
-}
-*/
-
-
-// ************************************************************************* //
diff --git a/src/fileFormats/vtk/foamVtkCore.H b/src/fileFormats/vtk/foamVtkCore.H
deleted file mode 100644
index adcdc00871..0000000000
--- a/src/fileFormats/vtk/foamVtkCore.H
+++ /dev/null
@@ -1,109 +0,0 @@
-/*---------------------------------------------------------------------------*\
-  =========                 |
-  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
-   \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2016 OpenCFD Ltd.
-     \\/     M anipulation  |
--------------------------------------------------------------------------------
-License
-    This file is part of OpenFOAM.
-
-    OpenFOAM is free software: you can redistribute it and/or modify it
-    under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
-    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-    for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
-
-Class
-    Foam::foamVtkCore
-
-Description
-    Core routines for dealing with VTK files.
-
-SourceFiles
-    foamVtkCore.C
-
-\*---------------------------------------------------------------------------*/
-
-#ifndef foamVtkCore_H
-#define foamVtkCore_H
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-namespace Foam
-{
-
-namespace fileFormats
-{
-
-/*---------------------------------------------------------------------------*\
-                  Class fileFormats::foamVtkCore Declaration
-\*---------------------------------------------------------------------------*/
-
-class foamVtkCore
-{
-public:
-
-    // Public Data, Declarations
-
-        //- The context when outputting a VTK file (XML or legacy).
-        enum OutputContext
-        {
-            INLINE,     //<! Generate header and inline data
-            HEADER,     //<! Generate header only
-            APPEND      //<! Generate append-data
-        };
-
-
-        //- Equivalent to enumeration in "vtkCellType.h"
-        enum vtkTypes
-        {
-            VTK_EMPTY_CELL       = 0,
-            VTK_VERTEX           = 1,
-            VTK_POLY_VERTEX      = 2,
-            VTK_LINE             = 3,
-            VTK_POLY_LINE        = 4,
-            VTK_TRIANGLE         = 5,
-            VTK_TRIANGLE_STRIP   = 6,
-            VTK_POLYGON          = 7,
-            VTK_PIXEL            = 8,
-            VTK_QUAD             = 9,
-            VTK_TETRA            = 10,
-            VTK_VOXEL            = 11,
-            VTK_HEXAHEDRON       = 12,
-            VTK_WEDGE            = 13,
-            VTK_PYRAMID          = 14,
-            VTK_PENTAGONAL_PRISM = 15,
-            VTK_HEXAGONAL_PRISM  = 16,
-            VTK_POLYHEDRON       = 42
-        };
-
-
-protected:
-
-    // Constructors
-
-        //- Construct null
-        foamVtkCore();
-
-};
-
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-} // End namespace fileFormats
-
-} // End namespace Foam
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-#endif
-
-// ************************************************************************* //
diff --git a/src/fileFormats/vtk/format/foamVtkAppendBase64Formatter.C b/src/fileFormats/vtk/format/foamVtkAppendBase64Formatter.C
index f54edcabea..5527e5c35a 100644
--- a/src/fileFormats/vtk/format/foamVtkAppendBase64Formatter.C
+++ b/src/fileFormats/vtk/format/foamVtkAppendBase64Formatter.C
@@ -28,15 +28,15 @@ License
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
-const char* Foam::foamVtkOutput::appendBase64Formatter::name_ = "append";
+const char* Foam::vtk::appendBase64Formatter::name_ = "append";
 
-const Foam::foamVtkOutput::outputOptions
-Foam::foamVtkOutput::appendBase64Formatter::opts_(formatType::APPEND_BASE64);
+const Foam::vtk::outputOptions
+Foam::vtk::appendBase64Formatter::opts_(formatType::APPEND_BASE64);
 
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::appendBase64Formatter::appendBase64Formatter
+Foam::vtk::appendBase64Formatter::appendBase64Formatter
 (
     std::ostream& os
 )
@@ -47,7 +47,7 @@ Foam::foamVtkOutput::appendBase64Formatter::appendBase64Formatter
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::appendBase64Formatter::~appendBase64Formatter()
+Foam::vtk::appendBase64Formatter::~appendBase64Formatter()
 {
     base64Layer::close();
 }
@@ -55,14 +55,14 @@ Foam::foamVtkOutput::appendBase64Formatter::~appendBase64Formatter()
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-const Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::appendBase64Formatter::opts() const
+const Foam::vtk::outputOptions&
+Foam::vtk::appendBase64Formatter::opts() const
 {
     return opts_;
 }
 
 
-const char* Foam::foamVtkOutput::appendBase64Formatter::name() const
+const char* Foam::vtk::appendBase64Formatter::name() const
 {
     return name_;
 }
diff --git a/src/fileFormats/vtk/format/foamVtkAppendBase64Formatter.H b/src/fileFormats/vtk/format/foamVtkAppendBase64Formatter.H
index 0a0dff20e3..2df2e8ce50 100644
--- a/src/fileFormats/vtk/format/foamVtkAppendBase64Formatter.H
+++ b/src/fileFormats/vtk/format/foamVtkAppendBase64Formatter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::appendBase64Formatter
+    Foam::vtk::appendBase64Formatter
 
 Description
     Appended base-64 encoded binary output.
@@ -42,7 +42,7 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -92,7 +92,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/format/foamVtkAppendRawFormatter.C b/src/fileFormats/vtk/format/foamVtkAppendRawFormatter.C
index 40effed271..0ff9e5c4cd 100644
--- a/src/fileFormats/vtk/format/foamVtkAppendRawFormatter.C
+++ b/src/fileFormats/vtk/format/foamVtkAppendRawFormatter.C
@@ -28,16 +28,16 @@ License
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
-const char* Foam::foamVtkOutput::appendRawFormatter::name_     = "append";
-const char* Foam::foamVtkOutput::appendRawFormatter::encoding_ = "raw";
+const char* Foam::vtk::appendRawFormatter::name_     = "append";
+const char* Foam::vtk::appendRawFormatter::encoding_ = "raw";
 
-const Foam::foamVtkOutput::outputOptions
-Foam::foamVtkOutput::appendRawFormatter::opts_(formatType::APPEND_BINARY);
+const Foam::vtk::outputOptions
+Foam::vtk::appendRawFormatter::opts_(formatType::APPEND_BINARY);
 
 
 // * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::appendRawFormatter::write
+void Foam::vtk::appendRawFormatter::write
 (
     const char* s,
     std::streamsize n
@@ -49,7 +49,7 @@ void Foam::foamVtkOutput::appendRawFormatter::write
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::appendRawFormatter::appendRawFormatter(std::ostream& os)
+Foam::vtk::appendRawFormatter::appendRawFormatter(std::ostream& os)
 :
     formatter(os)
 {}
@@ -57,58 +57,58 @@ Foam::foamVtkOutput::appendRawFormatter::appendRawFormatter(std::ostream& os)
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::appendRawFormatter::~appendRawFormatter()
+Foam::vtk::appendRawFormatter::~appendRawFormatter()
 {}
 
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-const Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::appendRawFormatter::opts() const
+const Foam::vtk::outputOptions&
+Foam::vtk::appendRawFormatter::opts() const
 {
     return opts_;
 }
 
 
-const char* Foam::foamVtkOutput::appendRawFormatter::name() const
+const char* Foam::vtk::appendRawFormatter::name() const
 {
     return name_;
 }
 
 
-const char* Foam::foamVtkOutput::appendRawFormatter::encoding() const
+const char* Foam::vtk::appendRawFormatter::encoding() const
 {
     return encoding_;
 }
 
 
-void Foam::foamVtkOutput::appendRawFormatter::writeSize(const uint64_t nBytes)
+void Foam::vtk::appendRawFormatter::writeSize(const uint64_t nBytes)
 {
     write(reinterpret_cast<const char*>(&nBytes), sizeof(uint64_t));
 }
 
 
-void Foam::foamVtkOutput::appendRawFormatter::write(const uint8_t val)
+void Foam::vtk::appendRawFormatter::write(const uint8_t val)
 {
     write(reinterpret_cast<const char*>(&val), sizeof(uint8_t));
 }
 
 
-void Foam::foamVtkOutput::appendRawFormatter::write(const label val)
+void Foam::vtk::appendRawFormatter::write(const label val)
 {
     // std::cerr<<"label:" << sizeof(val) << "=" << val << '\n';
     write(reinterpret_cast<const char*>(&val), sizeof(label));
 }
 
 
-void Foam::foamVtkOutput::appendRawFormatter::write(const float val)
+void Foam::vtk::appendRawFormatter::write(const float val)
 {
     // std::cerr<<"float:" << sizeof(val) << "=" << val << '\n';
     write(reinterpret_cast<const char*>(&val), sizeof(float));
 }
 
 
-void Foam::foamVtkOutput::appendRawFormatter::write(const double val)
+void Foam::vtk::appendRawFormatter::write(const double val)
 {
     // std::cerr<<"double as float=" << val << '\n';
     float copy(val);
@@ -116,7 +116,7 @@ void Foam::foamVtkOutput::appendRawFormatter::write(const double val)
 }
 
 
-void Foam::foamVtkOutput::appendRawFormatter::flush()
+void Foam::vtk::appendRawFormatter::flush()
 {/*nop*/}
 
 
diff --git a/src/fileFormats/vtk/format/foamVtkAppendRawFormatter.H b/src/fileFormats/vtk/format/foamVtkAppendRawFormatter.H
index aca458b05e..758fa8d93d 100644
--- a/src/fileFormats/vtk/format/foamVtkAppendRawFormatter.H
+++ b/src/fileFormats/vtk/format/foamVtkAppendRawFormatter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::appendRawFormatter
+    Foam::vtk::appendRawFormatter
 
 Description
     Appended raw binary output.
@@ -41,7 +41,7 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -115,7 +115,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/format/foamVtkAsciiFormatter.C b/src/fileFormats/vtk/format/foamVtkAsciiFormatter.C
index 7b05aafaf8..1bcbc3b84c 100644
--- a/src/fileFormats/vtk/format/foamVtkAsciiFormatter.C
+++ b/src/fileFormats/vtk/format/foamVtkAsciiFormatter.C
@@ -28,15 +28,15 @@ License
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
-const char* Foam::foamVtkOutput::asciiFormatter::name_ = "ascii";
+const char* Foam::vtk::asciiFormatter::name_ = "ascii";
 
-const Foam::foamVtkOutput::outputOptions
-Foam::foamVtkOutput::asciiFormatter::opts_(formatType::INLINE_ASCII);
+const Foam::vtk::outputOptions
+Foam::vtk::asciiFormatter::opts_(formatType::INLINE_ASCII);
 
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-inline void Foam::foamVtkOutput::asciiFormatter::next()
+inline void Foam::vtk::asciiFormatter::next()
 {
     if (pos_ == 6)
     {
@@ -51,7 +51,7 @@ inline void Foam::foamVtkOutput::asciiFormatter::next()
 }
 
 
-inline void Foam::foamVtkOutput::asciiFormatter::done()
+inline void Foam::vtk::asciiFormatter::done()
 {
     if (pos_)
     {
@@ -63,14 +63,14 @@ inline void Foam::foamVtkOutput::asciiFormatter::done()
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::asciiFormatter::asciiFormatter(std::ostream& os)
+Foam::vtk::asciiFormatter::asciiFormatter(std::ostream& os)
 :
     formatter(os),
     pos_(0)
 {}
 
 
-Foam::foamVtkOutput::asciiFormatter::asciiFormatter
+Foam::vtk::asciiFormatter::asciiFormatter
 (
     std::ostream& os,
     unsigned precision
@@ -85,7 +85,7 @@ Foam::foamVtkOutput::asciiFormatter::asciiFormatter
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::asciiFormatter::~asciiFormatter()
+Foam::vtk::asciiFormatter::~asciiFormatter()
 {
     done();
 }
@@ -93,65 +93,65 @@ Foam::foamVtkOutput::asciiFormatter::~asciiFormatter()
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-const Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::asciiFormatter::opts() const
+const Foam::vtk::outputOptions&
+Foam::vtk::asciiFormatter::opts() const
 {
     return opts_;
 }
 
 
-const char* Foam::foamVtkOutput::asciiFormatter::name() const
+const char* Foam::vtk::asciiFormatter::name() const
 {
     return name_;
 }
 
 
-const char* Foam::foamVtkOutput::asciiFormatter::encoding() const
+const char* Foam::vtk::asciiFormatter::encoding() const
 {
     return name_;
 }
 
 
-void Foam::foamVtkOutput::asciiFormatter::writeSize(const uint64_t ignored)
+void Foam::vtk::asciiFormatter::writeSize(const uint64_t ignored)
 {/*nop*/}
 
 
-void Foam::foamVtkOutput::asciiFormatter::write(const uint8_t val)
+void Foam::vtk::asciiFormatter::write(const uint8_t val)
 {
     next();
     os()<< int(val);
 }
 
 
-void Foam::foamVtkOutput::asciiFormatter::write(const label val)
+void Foam::vtk::asciiFormatter::write(const label val)
 {
     next();
     os()<< val;
 }
 
 
-void Foam::foamVtkOutput::asciiFormatter::write(const float val)
+void Foam::vtk::asciiFormatter::write(const float val)
 {
     next();
     os()<< val;
 }
 
 
-void Foam::foamVtkOutput::asciiFormatter::write(const double val)
+void Foam::vtk::asciiFormatter::write(const double val)
 {
     next();
     os()<< float(val);
 }
 
 
-void Foam::foamVtkOutput::asciiFormatter::flush()
+void Foam::vtk::asciiFormatter::flush()
 {
     done();
 }
 
 
 std::size_t
-Foam::foamVtkOutput::asciiFormatter::encodedLength(std::size_t ignored) const
+Foam::vtk::asciiFormatter::encodedLength(std::size_t ignored) const
 {
     return 0;
 }
diff --git a/src/fileFormats/vtk/format/foamVtkAsciiFormatter.H b/src/fileFormats/vtk/format/foamVtkAsciiFormatter.H
index c50281779e..bbedc55e91 100644
--- a/src/fileFormats/vtk/format/foamVtkAsciiFormatter.H
+++ b/src/fileFormats/vtk/format/foamVtkAsciiFormatter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::asciiFormatter
+    Foam::vtk::asciiFormatter
 
 Description
     Inline ASCII output.
@@ -43,7 +43,7 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -125,7 +125,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/format/foamVtkBase64Formatter.C b/src/fileFormats/vtk/format/foamVtkBase64Formatter.C
index a4ebc925fe..3e8d86be95 100644
--- a/src/fileFormats/vtk/format/foamVtkBase64Formatter.C
+++ b/src/fileFormats/vtk/format/foamVtkBase64Formatter.C
@@ -28,15 +28,15 @@ License
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
-const char* Foam::foamVtkOutput::base64Formatter::name_ = "binary";
+const char* Foam::vtk::base64Formatter::name_ = "binary";
 
-const Foam::foamVtkOutput::outputOptions
-Foam::foamVtkOutput::base64Formatter::opts_(formatType::INLINE_BASE64);
+const Foam::vtk::outputOptions
+Foam::vtk::base64Formatter::opts_(formatType::INLINE_BASE64);
 
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::base64Formatter::base64Formatter(std::ostream& os)
+Foam::vtk::base64Formatter::base64Formatter(std::ostream& os)
 :
     foamVtkBase64Layer(os)
 {}
@@ -44,7 +44,7 @@ Foam::foamVtkOutput::base64Formatter::base64Formatter(std::ostream& os)
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::base64Formatter::~base64Formatter()
+Foam::vtk::base64Formatter::~base64Formatter()
 {
     if (base64Layer::close())
     {
@@ -55,20 +55,20 @@ Foam::foamVtkOutput::base64Formatter::~base64Formatter()
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-const Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::base64Formatter::opts() const
+const Foam::vtk::outputOptions&
+Foam::vtk::base64Formatter::opts() const
 {
     return opts_;
 }
 
 
-const char* Foam::foamVtkOutput::base64Formatter::name() const
+const char* Foam::vtk::base64Formatter::name() const
 {
     return name_;
 }
 
 
-void Foam::foamVtkOutput::base64Formatter::flush()
+void Foam::vtk::base64Formatter::flush()
 {
     if (base64Layer::close())
     {
diff --git a/src/fileFormats/vtk/format/foamVtkBase64Formatter.H b/src/fileFormats/vtk/format/foamVtkBase64Formatter.H
index edf64797ed..df27f23087 100644
--- a/src/fileFormats/vtk/format/foamVtkBase64Formatter.H
+++ b/src/fileFormats/vtk/format/foamVtkBase64Formatter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::base64Formatter
+    Foam::vtk::base64Formatter
 
 Description
     Inline base-64 encoded binary output.
@@ -40,7 +40,7 @@ Description
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -95,7 +95,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/format/foamVtkBase64Layer.C b/src/fileFormats/vtk/format/foamVtkBase64Layer.C
index 32d2d81642..500a8dce9c 100644
--- a/src/fileFormats/vtk/format/foamVtkBase64Layer.C
+++ b/src/fileFormats/vtk/format/foamVtkBase64Layer.C
@@ -27,12 +27,12 @@ License
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
-const char* Foam::foamVtkOutput::foamVtkBase64Layer::encoding_ = "base64";
+const char* Foam::vtk::foamVtkBase64Layer::encoding_ = "base64";
 
 
 // * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::foamVtkBase64Layer::write
+void Foam::vtk::foamVtkBase64Layer::write
 (
     const char* s,
     std::streamsize n
@@ -44,7 +44,7 @@ void Foam::foamVtkOutput::foamVtkBase64Layer::write
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::foamVtkBase64Layer::foamVtkBase64Layer(std::ostream& os)
+Foam::vtk::foamVtkBase64Layer::foamVtkBase64Layer(std::ostream& os)
 :
     formatter(os),
     base64Layer(os)
@@ -53,7 +53,7 @@ Foam::foamVtkOutput::foamVtkBase64Layer::foamVtkBase64Layer(std::ostream& os)
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::foamVtkBase64Layer::~foamVtkBase64Layer()
+Foam::vtk::foamVtkBase64Layer::~foamVtkBase64Layer()
 {
     base64Layer::close();
 }
@@ -61,39 +61,39 @@ Foam::foamVtkOutput::foamVtkBase64Layer::~foamVtkBase64Layer()
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-const char* Foam::foamVtkOutput::foamVtkBase64Layer::encoding() const
+const char* Foam::vtk::foamVtkBase64Layer::encoding() const
 {
     return encoding_;
 }
 
 
-void Foam::foamVtkOutput::foamVtkBase64Layer::writeSize(const uint64_t nBytes)
+void Foam::vtk::foamVtkBase64Layer::writeSize(const uint64_t nBytes)
 {
     write(reinterpret_cast<const char*>(&nBytes), sizeof(uint64_t));
 }
 
 
-void Foam::foamVtkOutput::foamVtkBase64Layer::write(const uint8_t val)
+void Foam::vtk::foamVtkBase64Layer::write(const uint8_t val)
 {
     base64Layer::add(val);
 }
 
 
-void Foam::foamVtkOutput::foamVtkBase64Layer::write(const label val)
+void Foam::vtk::foamVtkBase64Layer::write(const label val)
 {
     // std::cerr<<"label:" << sizeof(val) << "=" << val << '\n';
     write(reinterpret_cast<const char*>(&val), sizeof(label));
 }
 
 
-void Foam::foamVtkOutput::foamVtkBase64Layer::write(const float val)
+void Foam::vtk::foamVtkBase64Layer::write(const float val)
 {
     // std::cerr<<"float:" << sizeof(val) << "=" << val << '\n';
     write(reinterpret_cast<const char*>(&val), sizeof(float));
 }
 
 
-void Foam::foamVtkOutput::foamVtkBase64Layer::write(const double val)
+void Foam::vtk::foamVtkBase64Layer::write(const double val)
 {
     // std::cerr<<"double as float=" << val << '\n';
     float copy(val);
@@ -101,13 +101,13 @@ void Foam::foamVtkOutput::foamVtkBase64Layer::write(const double val)
 }
 
 
-void Foam::foamVtkOutput::foamVtkBase64Layer::flush()
+void Foam::vtk::foamVtkBase64Layer::flush()
 {
     base64Layer::close();
 }
 
 
-std::size_t Foam::foamVtkOutput::foamVtkBase64Layer::encodedLength
+std::size_t Foam::vtk::foamVtkBase64Layer::encodedLength
 (
     std::size_t n
 ) const
diff --git a/src/fileFormats/vtk/format/foamVtkBase64Layer.H b/src/fileFormats/vtk/format/foamVtkBase64Layer.H
index 09b978017b..6bfa3652d4 100644
--- a/src/fileFormats/vtk/format/foamVtkBase64Layer.H
+++ b/src/fileFormats/vtk/format/foamVtkBase64Layer.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::foamVtkBase64Layer
+    Foam::vtk::foamVtkBase64Layer
 
 Description
     Base-64 encoded output layer - normally only used indirectly by formatters.
@@ -39,7 +39,7 @@ Description
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -108,7 +108,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/format/foamVtkFormatter.C b/src/fileFormats/vtk/format/foamVtkFormatter.C
index 0c2ce22574..2bb49322d3 100644
--- a/src/fileFormats/vtk/format/foamVtkFormatter.C
+++ b/src/fileFormats/vtk/format/foamVtkFormatter.C
@@ -26,19 +26,19 @@ License
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::formatter::~formatter()
+Foam::vtk::formatter::~formatter()
 {}
 
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-std::size_t Foam::foamVtkOutput::formatter::encodedLength(std::size_t n) const
+std::size_t Foam::vtk::formatter::encodedLength(std::size_t n) const
 {
     return n;
 }
 
 
-void Foam::foamVtkOutput::formatter::indent()
+void Foam::vtk::formatter::indent()
 {
     label n = xmlTags_.size() * 2;
     while (n--)
@@ -48,8 +48,8 @@ void Foam::foamVtkOutput::formatter::indent()
 }
 
 
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::xmlHeader()
+Foam::vtk::formatter&
+Foam::vtk::formatter::xmlHeader()
 {
     if (inTag_)
     {
@@ -64,8 +64,8 @@ Foam::foamVtkOutput::formatter::xmlHeader()
 }
 
 
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::xmlComment(const std::string& comment)
+Foam::vtk::formatter&
+Foam::vtk::formatter::xmlComment(const std::string& comment)
 {
     if (inTag_)
     {
@@ -81,8 +81,8 @@ Foam::foamVtkOutput::formatter::xmlComment(const std::string& comment)
 }
 
 
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::openTag(const word& tagName)
+Foam::vtk::formatter&
+Foam::vtk::formatter::openTag(const word& tagName)
 {
     if (inTag_)
     {
@@ -102,8 +102,8 @@ Foam::foamVtkOutput::formatter::openTag(const word& tagName)
 }
 
 
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::closeTag(const bool isEmpty)
+Foam::vtk::formatter&
+Foam::vtk::formatter::closeTag(const bool isEmpty)
 {
     if (!inTag_)
     {
@@ -126,8 +126,8 @@ Foam::foamVtkOutput::formatter::closeTag(const bool isEmpty)
 }
 
 
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::endTag(const word& tagName)
+Foam::vtk::formatter&
+Foam::vtk::formatter::endTag(const word& tagName)
 {
     const word curr = xmlTags_.pop();
     indent();
@@ -140,11 +140,11 @@ Foam::foamVtkOutput::formatter::endTag(const word& tagName)
             << endl;
     }
 
-    // verify inTag_
+    // verify expected end tag
     if (!tagName.empty() && tagName != curr)
     {
         WarningInFunction
-            << "expected to end xml-tag '" << tagName
+            << "expecting to end xml-tag '" << tagName
             << "' but found '" << curr << "' instead"
             << endl;
     }
@@ -157,19 +157,19 @@ Foam::foamVtkOutput::formatter::endTag(const word& tagName)
 }
 
 
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::beginVTKFile
+Foam::vtk::formatter&
+Foam::vtk::formatter::beginVTKFile
 (
     const word& contentType,
     const word& contentVersion,
     const bool leaveOpen
 )
 {
-    openTag(vtkFileTag::VTK_FILE);
+    openTag(vtk::fileTag::VTK_FILE);
     xmlAttr("type",        contentType);
     xmlAttr("version",     contentVersion);
-    xmlAttr("byte_order",  foamVtkPTraits<Foam::endian>::typeName);
-    xmlAttr("header_type", foamVtkPTraits<headerType>::typeName);
+    xmlAttr("byte_order",  vtkPTraits<Foam::endian>::typeName);
+    xmlAttr("header_type", vtkPTraits<headerType>::typeName);
     closeTag();
 
     openTag(contentType);
@@ -182,8 +182,15 @@ Foam::foamVtkOutput::formatter::beginVTKFile
 }
 
 
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::beginAppendedData()
+Foam::vtk::formatter&
+Foam::vtk::formatter::endVTKFile()
+{
+    return endTag(vtk::fileTag::VTK_FILE);
+}
+
+
+Foam::vtk::formatter&
+Foam::vtk::formatter::beginAppendedData()
 {
     openTag("AppendedData");
     xmlAttr("encoding", encoding());
@@ -194,8 +201,17 @@ Foam::foamVtkOutput::formatter::beginAppendedData()
 }
 
 
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::xmlAttr
+Foam::vtk::formatter&
+Foam::vtk::formatter::endAppendedData()
+{
+    flush();     // flush any pending encoded content
+    os_ << nl;   // ensure clear separation from content.
+    return endTag("AppendedData");
+}
+
+
+Foam::vtk::formatter&
+Foam::vtk::formatter::xmlAttr
 (
     const word& k,
     const std::string& v,
diff --git a/src/fileFormats/vtk/format/foamVtkFormatter.H b/src/fileFormats/vtk/format/foamVtkFormatter.H
index 40c7ed98d5..abe6e2972d 100644
--- a/src/fileFormats/vtk/format/foamVtkFormatter.H
+++ b/src/fileFormats/vtk/format/foamVtkFormatter.H
@@ -22,12 +22,12 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::formatter
+    Foam::vtk::formatter
 
 Description
     Abstract class for a VTK output stream formatter.
 
-    Includes very simple support for writing XML tags.
+    Includes very simple support for writing XML elements.
 
 SourceFiles
     foamVtkFormatter.C
@@ -44,9 +44,8 @@ SourceFiles
 #include "word.H"
 #include "UList.H"
 #include "LIFOStack.H"
-#include "foamVtkFileEnums.H"
+#include "foamVtkCore.H"
 #include "foamVtkPTraits.H"
-#include "foamVtkOutputTypes.H"
 
 #include <iostream>
 
@@ -54,7 +53,7 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 class outputOptions;
@@ -77,13 +76,15 @@ class formatter
         mutable bool inTag_;
 
 
-        //- Write XML attribute
+    // Private Member Functions
+
+        //- Write XML attribute key/value pair
         template<class Type>
-        formatter& xmlAttribute
+        formatter& writeAttribute
         (
             const word& k,
             const Type& v,
-            const char quote
+            const char quote = '\''
         );
 
 
@@ -161,7 +162,7 @@ public:
 
         //- Open XML tag
         //  \return formatter for chaining
-        inline formatter& openTag(const vtkFileTag& tagEnum);
+        inline formatter& openTag(const vtk::fileTag& tagEnum);
 
         //- Close XML tag, optional as an empty container.
         //  Always adds a trailing newline.
@@ -176,7 +177,7 @@ public:
         //- End XML tag with sanity check
         //  Always adds a trailing newline.
         //  \return formatter for chaining
-        inline formatter& endTag(const vtkFileTag& tagEnum);
+        inline formatter& endTag(const vtk::fileTag& tagEnum);
 
         //- Write XML tag without any attributes. Combines openTag/closeTag.
         //  \return formatter for chaining
@@ -184,7 +185,7 @@ public:
 
         //- Write XML tag without any attributes. Combines openTag/closeTag.
         //  \return formatter for chaining
-        inline formatter& tag(const vtkFileTag& tagEnum);
+        inline formatter& tag(const vtk::fileTag& tagEnum);
 
         //- Add a "VTKFile" XML tag for contentType, followed by a tag for
         //  the contentType itself. Optionally leave the contentType tag
@@ -203,7 +204,7 @@ public:
         //  \return formatter for chaining
         inline formatter& beginVTKFile
         (
-            const vtkFileTag& contentType,
+            const vtk::fileTag& contentType,
             const word& contentVersion,
             const bool leaveOpen = false
         );
@@ -222,7 +223,7 @@ public:
         //- Open "DataArray" XML tag
         //  \return formatter for chaining
         template<class Type, int nComp=0>
-        formatter& openDataArray(const vtkFileTag& tagEnum);
+        formatter& openDataArray(const vtk::dataArrayAttr& attrEnum);
 
 
         //- Insert a single "PDataArray" XML entry tag.
@@ -238,11 +239,11 @@ public:
 
         //- End "AppendedData" XML tag
         //  \return formatter for chaining
-        inline formatter& endAppendedData();
+        formatter& endAppendedData();
 
         //- End "VTKFile" XML tag
         //  \return formatter for chaining
-        inline formatter& endVTKFile();
+        formatter& endVTKFile();
 
 
         //- Write XML attribute
@@ -290,35 +291,39 @@ public:
             const char quote = '\''
         );
 
-
-    // Member Operators
+        //- Write XML attribute
+        //  \return formatter for chaining
+        inline formatter& xmlAttr
+        (
+            const vtk::fileAttr& attrEnum,
+            const int32_t v,
+            const char quote = '\''
+        );
 
         //- Write XML attribute
         //  \return formatter for chaining
-        inline formatter& operator()(const word& k, const std::string& v);
+        inline formatter& xmlAttr
+        (
+            const vtk::fileAttr& attrEnum,
+            const int64_t v,
+            const char quote = '\''
+        );
 
         //- Write XML attribute
         //  \return formatter for chaining
-        inline formatter& operator()(const word& k, const int32_t v);
-
-        //- Write XML attribute
-        //  \return formatter for chaining
-        inline formatter& operator()(const word& k, const int64_t v);
-
-        //- Write XML attribute
-        //  \return formatter for chaining
-        inline formatter& operator()(const word& k, const uint64_t v);
-
-        //- Write XML attribute
-        //  \return formatter for chaining
-        inline formatter& operator()(const word& k, const scalar v);
+        inline formatter& xmlAttr
+        (
+            const vtk::fileAttr& attrEnum,
+            const uint64_t v,
+            const char quote = '\''
+        );
 
 };
 
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/format/foamVtkFormatterI.H b/src/fileFormats/vtk/format/foamVtkFormatterI.H
index 39e1e5a013..58e050bf54 100644
--- a/src/fileFormats/vtk/format/foamVtkFormatterI.H
+++ b/src/fileFormats/vtk/format/foamVtkFormatterI.H
@@ -25,7 +25,7 @@ License
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-inline Foam::foamVtkOutput::formatter::formatter(std::ostream& os)
+inline Foam::vtk::formatter::formatter(std::ostream& os)
 :
     os_(os),
     xmlTags_(),
@@ -35,28 +35,28 @@ inline Foam::foamVtkOutput::formatter::formatter(std::ostream& os)
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-inline std::ostream& Foam::foamVtkOutput::formatter::os()
+inline std::ostream& Foam::vtk::formatter::os()
 {
     return os_;
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::openTag(const vtkFileTag& tagEnum)
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::openTag(const vtk::fileTag& tagEnum)
 {
-    return openTag(vtkFileTagNames[tagEnum]);
+    return openTag(vtk::fileTagNames[tagEnum]);
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::endTag(const vtkFileTag& tagEnum)
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::endTag(const vtk::fileTag& tagEnum)
 {
-    return endTag(vtkFileTagNames[tagEnum]);
+    return endTag(vtk::fileTagNames[tagEnum]);
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::tag(const word& tagName)
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::tag(const word& tagName)
 {
     openTag(tagName);
     closeTag();
@@ -65,135 +65,118 @@ Foam::foamVtkOutput::formatter::tag(const word& tagName)
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::tag(const vtkFileTag& tagEnum)
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::tag(const vtk::fileTag& tagEnum)
 {
-    return tag(vtkFileTagNames[tagEnum]);
+    return tag(vtk::fileTagNames[tagEnum]);
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::beginVTKFile
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::beginVTKFile
 (
-    const vtkFileTag& contentType,
+    const vtk::fileTag& contentType,
     const word& contentVersion,
     const bool leaveOpen
 )
 {
     return beginVTKFile
     (
-        vtkFileTagNames[contentType],
+        vtk::fileTagNames[contentType],
         contentVersion,
         leaveOpen
     );
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::endDataArray()
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::endDataArray()
 {
     return endTag("DataArray");
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::endAppendedData()
-{
-    flush();     // flush any pending encoded content
-    os_ << '\n'; // clear separation from content.
-    return endTag("AppendedData");
-}
-
-
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::endVTKFile()
-{
-    return endTag(vtkFileTag::VTK_FILE);
-}
-
-
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::xmlAttr
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::xmlAttr
 (
     const word& k,
     const int32_t v,
     const char quote
 )
 {
-    return xmlAttribute(k, v, quote);
+    return writeAttribute(k, v, quote);
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::xmlAttr
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::xmlAttr
 (
     const word& k,
     const int64_t v,
     const char quote
 )
 {
-    return xmlAttribute(k, v, quote);
+    return writeAttribute(k, v, quote);
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::xmlAttr
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::xmlAttr
 (
     const word& k,
     const uint64_t v,
     const char quote
 )
 {
-    return xmlAttribute(k, v, quote);
+    return writeAttribute(k, v, quote);
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::xmlAttr
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::xmlAttr
 (
     const word& k,
     const scalar v,
     const char quote
 )
 {
-    return xmlAttribute(k, v, quote);
+    return writeAttribute(k, v, quote);
 }
 
 
-// * * * * * * * * * * * * * * Member Operators * * * * * * * * * * * * * * //
-
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::operator()(const word& k, const std::string& v)
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::xmlAttr
+(
+    const vtk::fileAttr& attrEnum,
+    const int32_t v,
+    const char quote
+)
 {
-    return xmlAttr(k, v);
+    return xmlAttr(vtk::fileAttrNames[attrEnum], v, quote);
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::operator()(const word& k, const int32_t v)
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::xmlAttr
+(
+    const vtk::fileAttr& attrEnum,
+    const int64_t v,
+    const char quote
+)
 {
-    return xmlAttr(k, v);
+    return xmlAttr(vtk::fileAttrNames[attrEnum], v, quote);
 }
 
 
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::operator()(const word& k, const int64_t v)
+inline Foam::vtk::formatter&
+Foam::vtk::formatter::xmlAttr
+(
+    const vtk::fileAttr& attrEnum,
+    const uint64_t v,
+    const char quote
+)
 {
-    return xmlAttr(k, v);
-}
-
-
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::operator()(const word& k, const uint64_t v)
-{
-    return xmlAttr(k, v);
-}
-
-
-inline Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::operator()(const word& k, const scalar v)
-{
-    return xmlAttr(k, v);
+    return xmlAttr(vtk::fileAttrNames[attrEnum], v, quote);
 }
 
 
diff --git a/src/fileFormats/vtk/format/foamVtkFormatterTemplates.C b/src/fileFormats/vtk/format/foamVtkFormatterTemplates.C
index 79e3b7a239..87f4f9131b 100644
--- a/src/fileFormats/vtk/format/foamVtkFormatterTemplates.C
+++ b/src/fileFormats/vtk/format/foamVtkFormatterTemplates.C
@@ -27,8 +27,8 @@ License
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 template<class Type>
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::xmlAttribute
+Foam::vtk::formatter&
+Foam::vtk::formatter::writeAttribute
 (
     const word& k,
     const Type& v,
@@ -49,18 +49,18 @@ Foam::foamVtkOutput::formatter::xmlAttribute
 
 
 template<class Type, int nComp>
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::openDataArray
+Foam::vtk::formatter&
+Foam::vtk::formatter::openDataArray
 (
     const word& dataName
 )
 {
     openTag("DataArray");
-    xmlAttr("type", foamVtkPTraits<Type>::typeName);
+    xmlAttr("type", vtkPTraits<Type>::typeName);
     xmlAttr("Name", dataName);
     if (nComp > 1)
     {
-        xmlAttr("NumberOfComponents", nComp);
+        xmlAttr(fileAttr::NUMBER_OF_COMPONENTS, nComp);
     }
     xmlAttr("format", name());
 
@@ -69,32 +69,32 @@ Foam::foamVtkOutput::formatter::openDataArray
 
 
 template<class Type, int nComp>
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::openDataArray
+Foam::vtk::formatter&
+Foam::vtk::formatter::openDataArray
 (
-    const vtkFileTag& tagEnum
+    const vtk::dataArrayAttr& attrEnum
 )
 {
-    return openDataArray<Type, nComp>(vtkFileTagNames[tagEnum]);
+    return openDataArray<Type, nComp>(vtk::dataArrayAttrNames[attrEnum]);
 }
 
 
 template<class Type, int nComp>
-Foam::foamVtkOutput::formatter&
-Foam::foamVtkOutput::formatter::PDataArray
+Foam::vtk::formatter&
+Foam::vtk::formatter::PDataArray
 (
     const word& dataName
 )
 {
     openTag("PDataArray");
-    xmlAttr("type", foamVtkPTraits<Type>::typeName);
+    xmlAttr("type", vtkPTraits<Type>::typeName);
     if (dataName.size())
     {
         xmlAttr("Name", dataName);
     }
     if (nComp > 1)
     {
-        xmlAttr("NumberOfComponents", nComp);
+        xmlAttr(fileAttr::NUMBER_OF_COMPONENTS, nComp);
     }
 
     closeTag(true);
diff --git a/src/fileFormats/vtk/format/foamVtkLegacyAsciiFormatter.C b/src/fileFormats/vtk/format/foamVtkLegacyAsciiFormatter.C
index 4e31fc46af..fe8728854c 100644
--- a/src/fileFormats/vtk/format/foamVtkLegacyAsciiFormatter.C
+++ b/src/fileFormats/vtk/format/foamVtkLegacyAsciiFormatter.C
@@ -28,15 +28,15 @@ License
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
-const char* Foam::foamVtkOutput::legacyAsciiFormatter::legacyName_ = "ASCII";
+const char* Foam::vtk::legacyAsciiFormatter::legacyName_ = "ASCII";
 
-const Foam::foamVtkOutput::outputOptions
-Foam::foamVtkOutput::legacyAsciiFormatter::opts_(formatType::LEGACY_ASCII);
+const Foam::vtk::outputOptions
+Foam::vtk::legacyAsciiFormatter::opts_(formatType::LEGACY_ASCII);
 
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::legacyAsciiFormatter::legacyAsciiFormatter
+Foam::vtk::legacyAsciiFormatter::legacyAsciiFormatter
 (
     std::ostream& os
 )
@@ -45,7 +45,7 @@ Foam::foamVtkOutput::legacyAsciiFormatter::legacyAsciiFormatter
 {}
 
 
-Foam::foamVtkOutput::legacyAsciiFormatter::legacyAsciiFormatter
+Foam::vtk::legacyAsciiFormatter::legacyAsciiFormatter
 (
     std::ostream& os,
     unsigned precision
@@ -57,26 +57,26 @@ Foam::foamVtkOutput::legacyAsciiFormatter::legacyAsciiFormatter
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::legacyAsciiFormatter::~legacyAsciiFormatter()
+Foam::vtk::legacyAsciiFormatter::~legacyAsciiFormatter()
 {}
 
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-const Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::legacyAsciiFormatter::opts() const
+const Foam::vtk::outputOptions&
+Foam::vtk::legacyAsciiFormatter::opts() const
 {
     return opts_;
 }
 
 
-const char* Foam::foamVtkOutput::legacyAsciiFormatter::name() const
+const char* Foam::vtk::legacyAsciiFormatter::name() const
 {
     return legacyName_;
 }
 
 
-const char* Foam::foamVtkOutput::legacyAsciiFormatter::encoding() const
+const char* Foam::vtk::legacyAsciiFormatter::encoding() const
 {
     return legacyName_;
 }
diff --git a/src/fileFormats/vtk/format/foamVtkLegacyAsciiFormatter.H b/src/fileFormats/vtk/format/foamVtkLegacyAsciiFormatter.H
index cb764b2992..7301ef9854 100644
--- a/src/fileFormats/vtk/format/foamVtkLegacyAsciiFormatter.H
+++ b/src/fileFormats/vtk/format/foamVtkLegacyAsciiFormatter.H
@@ -22,10 +22,10 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::legacyAsciiFormatter
+    Foam::vtk::legacyAsciiFormatter
 
 Description
-    Formatting as per Foam::foamVtkOutput::asciiFormatter, but with
+    Formatting as per Foam::vtk::asciiFormatter, but with
     naming for legacy output.
 
 SourceFiles
@@ -42,7 +42,7 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -99,7 +99,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/format/foamVtkLegacyRawFormatter.C b/src/fileFormats/vtk/format/foamVtkLegacyRawFormatter.C
index b533d0c56e..28b042c195 100644
--- a/src/fileFormats/vtk/format/foamVtkLegacyRawFormatter.C
+++ b/src/fileFormats/vtk/format/foamVtkLegacyRawFormatter.C
@@ -29,15 +29,15 @@ License
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
-const char* Foam::foamVtkOutput::legacyRawFormatter::legacyName_ = "BINARY";
+const char* Foam::vtk::legacyRawFormatter::legacyName_ = "BINARY";
 
-const Foam::foamVtkOutput::outputOptions
-Foam::foamVtkOutput::legacyRawFormatter::opts_(formatType::LEGACY_BINARY);
+const Foam::vtk::outputOptions
+Foam::vtk::legacyRawFormatter::opts_(formatType::LEGACY_BINARY);
 
 
 // * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::legacyRawFormatter::write
+void Foam::vtk::legacyRawFormatter::write
 (
     const char* s,
     std::streamsize n
@@ -49,7 +49,7 @@ void Foam::foamVtkOutput::legacyRawFormatter::write
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::legacyRawFormatter::legacyRawFormatter
+Foam::vtk::legacyRawFormatter::legacyRawFormatter
 (
     std::ostream& os
 )
@@ -60,39 +60,39 @@ Foam::foamVtkOutput::legacyRawFormatter::legacyRawFormatter
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::legacyRawFormatter::~legacyRawFormatter()
+Foam::vtk::legacyRawFormatter::~legacyRawFormatter()
 {}
 
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-const Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::legacyRawFormatter::opts() const
+const Foam::vtk::outputOptions&
+Foam::vtk::legacyRawFormatter::opts() const
 {
     return opts_;
 }
 
 
-const char* Foam::foamVtkOutput::legacyRawFormatter::name() const
+const char* Foam::vtk::legacyRawFormatter::name() const
 {
     return legacyName_;
 }
 
 
-const char* Foam::foamVtkOutput::legacyRawFormatter::encoding() const
+const char* Foam::vtk::legacyRawFormatter::encoding() const
 {
     return legacyName_;
 }
 
 
-void Foam::foamVtkOutput::legacyRawFormatter::writeSize
+void Foam::vtk::legacyRawFormatter::writeSize
 (
     const uint64_t ignored
 )
 {/*nop*/}
 
 
-void Foam::foamVtkOutput::legacyRawFormatter::write
+void Foam::vtk::legacyRawFormatter::write
 (
     const uint8_t val
 )
@@ -104,7 +104,7 @@ void Foam::foamVtkOutput::legacyRawFormatter::write
 }
 
 
-void Foam::foamVtkOutput::legacyRawFormatter::write
+void Foam::vtk::legacyRawFormatter::write
 (
     const label val
 )
@@ -127,7 +127,7 @@ void Foam::foamVtkOutput::legacyRawFormatter::write
 }
 
 
-void Foam::foamVtkOutput::legacyRawFormatter::write
+void Foam::vtk::legacyRawFormatter::write
 (
     const float val
 )
@@ -148,7 +148,7 @@ void Foam::foamVtkOutput::legacyRawFormatter::write
 }
 
 
-void Foam::foamVtkOutput::legacyRawFormatter::write
+void Foam::vtk::legacyRawFormatter::write
 (
     const double val
 )
@@ -160,7 +160,7 @@ void Foam::foamVtkOutput::legacyRawFormatter::write
 }
 
 
-void Foam::foamVtkOutput::legacyRawFormatter::flush()
+void Foam::vtk::legacyRawFormatter::flush()
 {
     os()<< '\n';
 }
diff --git a/src/fileFormats/vtk/format/foamVtkLegacyRawFormatter.H b/src/fileFormats/vtk/format/foamVtkLegacyRawFormatter.H
index 2b558fc977..3f24f05cb0 100644
--- a/src/fileFormats/vtk/format/foamVtkLegacyRawFormatter.H
+++ b/src/fileFormats/vtk/format/foamVtkLegacyRawFormatter.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::legacyRawFormatter
+    Foam::vtk::legacyRawFormatter
 
 Description
     Binary output for the VTK legacy format, always written as big-endian
@@ -44,7 +44,7 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -118,7 +118,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/output/foamVtkOutput.C b/src/fileFormats/vtk/output/foamVtkOutput.C
index 1f8dfdf503..7e18f72314 100644
--- a/src/fileFormats/vtk/output/foamVtkOutput.C
+++ b/src/fileFormats/vtk/output/foamVtkOutput.C
@@ -36,58 +36,58 @@ License
 
 // * * * * * * * * * * * * * * * Static Data * * * * * * * * * * * * * * * * //
 
-const Foam::Enum<Foam::vtkFileTag>
-Foam::foamVtkOutput::legacy::contentNames
+const Foam::Enum<Foam::vtk::fileTag>
+Foam::vtk::legacy::contentNames
 {
-    { vtkFileTag::POLY_DATA,         "POLYDATA" },
-    { vtkFileTag::UNSTRUCTURED_GRID, "UNSTRUCTURED_GRID" },
+    { vtk::fileTag::POLY_DATA,         "POLYDATA" },
+    { vtk::fileTag::UNSTRUCTURED_GRID, "UNSTRUCTURED_GRID" },
 };
 
 
-const Foam::Enum<Foam::vtkFileTag>
-Foam::foamVtkOutput::legacy::dataTypeNames
+const Foam::Enum<Foam::vtk::fileTag>
+Foam::vtk::legacy::dataTypeNames
 {
-    { vtkFileTag::CELL_DATA,  "CELL_DATA" },
-    { vtkFileTag::POINT_DATA, "POINT_DATA" }
+    { vtk::fileTag::CELL_DATA,  "CELL_DATA" },
+    { vtk::fileTag::POINT_DATA, "POINT_DATA" }
 };
 
 
 // * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * * //
 
-Foam::autoPtr<Foam::foamVtkOutput::formatter>
-Foam::foamVtkOutput::newFormatter
+Foam::autoPtr<Foam::vtk::formatter>
+Foam::vtk::newFormatter
 (
     std::ostream& os,
     const enum formatType fmtType,
     unsigned prec
 )
 {
-    autoPtr<foamVtkOutput::formatter> fmt;
+    autoPtr<vtk::formatter> fmt;
 
     switch (fmtType)
     {
         case formatType::INLINE_ASCII:
-            fmt.set(new foamVtkOutput::asciiFormatter(os, prec));
+            fmt.set(new vtk::asciiFormatter(os, prec));
             break;
 
         case formatType::INLINE_BASE64:
-            fmt.set(new foamVtkOutput::base64Formatter(os));
+            fmt.set(new vtk::base64Formatter(os));
             break;
 
         case formatType::APPEND_BASE64:
-            fmt.set(new foamVtkOutput::appendBase64Formatter(os));
+            fmt.set(new vtk::appendBase64Formatter(os));
             break;
 
         case formatType::APPEND_BINARY:
-            fmt.set(new foamVtkOutput::appendRawFormatter(os));
+            fmt.set(new vtk::appendRawFormatter(os));
             break;
 
         case formatType::LEGACY_ASCII:
-            fmt.set(new foamVtkOutput::legacyAsciiFormatter(os, prec));
+            fmt.set(new vtk::legacyAsciiFormatter(os, prec));
             break;
 
         case formatType::LEGACY_BINARY:
-            fmt.set(new foamVtkOutput::legacyRawFormatter(os));
+            fmt.set(new vtk::legacyRawFormatter(os));
             break;
     }
 
@@ -95,7 +95,7 @@ Foam::foamVtkOutput::newFormatter
 }
 
 
-Foam::label Foam::foamVtkOutput::writeVtmFile
+Foam::label Foam::vtk::writeVtmFile
 (
     std::ostream& os,
     const UList<fileName>& files
@@ -112,9 +112,9 @@ Foam::label Foam::foamVtkOutput::writeVtmFile
     forAll(files, i)
     {
         vtmFile
-            .openTag(vtkFileTag::DATA_SET)
-            ( "index", i )
-            ( "file", files[i] )
+            .openTag(vtk::fileTag::DATA_SET)
+            .xmlAttr("index", i)
+            .xmlAttr("file", files[i])
             .closeTag(true);
     }
 
@@ -124,9 +124,9 @@ Foam::label Foam::foamVtkOutput::writeVtmFile
 }
 
 
-std::ostream& Foam::foamVtkOutput::legacy::fileHeader
+std::ostream& Foam::vtk::legacy::fileHeader
 (
-    foamVtkOutput::formatter& fmt,
+    vtk::formatter& fmt,
     const std::string& title,
     const std::string& contentType
 )
diff --git a/src/fileFormats/vtk/output/foamVtkOutput.H b/src/fileFormats/vtk/output/foamVtkOutput.H
index f298d6ff12..4dd909219d 100644
--- a/src/fileFormats/vtk/output/foamVtkOutput.H
+++ b/src/fileFormats/vtk/output/foamVtkOutput.H
@@ -22,14 +22,14 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Namespace
-    Foam::foamVtkOutput
+    Foam::vtk
 
 Description
     Namespace for handling VTK output.
     Contains classes and functions for writing VTK file content.
 
 Namespace
-    Foam::foamVtkOutput::legacy
+    Foam::vtk::legacy
 
 Description
     Namespace for legacy VTK output constants and functions.
@@ -45,7 +45,7 @@ SourceFiles
 
 #include "autoPtr.H"
 #include "Enum.H"
-#include "foamVtkOutputTypes.H"
+#include "foamVtkCore.H"
 #include "foamVtkFormatter.H"
 #include "floatScalar.H"
 #include "IOstream.H"
@@ -54,27 +54,20 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-  // Typedefs
-
-    //- Use UInt64 for header data
-    typedef formatter::headerType headerType;
-
-
   // Constants
 
-
   // General Functions
 
     //- Return a default asciiFormatter
-    autoPtr<foamVtkOutput::formatter> newFormatter(std::ostream& os);
+    autoPtr<vtk::formatter> newFormatter(std::ostream& os);
 
     //- Return a new formatter based on the specified format type
-    autoPtr<foamVtkOutput::formatter> newFormatter
+    autoPtr<vtk::formatter> newFormatter
     (
         std::ostream& os,
         const enum formatType fmtType,
@@ -90,7 +83,7 @@ namespace foamVtkOutput
     template<class Type>
     inline void write
     (
-        foamVtkOutput::formatter& fmt,
+        vtk::formatter& fmt,
         const Type& val
     );
 
@@ -100,7 +93,7 @@ namespace foamVtkOutput
     template<class Type>
     void writeList
     (
-        foamVtkOutput::formatter& fmt,
+        vtk::formatter& fmt,
         const UList<Type>& lst
     );
 
@@ -109,7 +102,7 @@ namespace foamVtkOutput
     template<class Type, unsigned Size>
     void writeList
     (
-        foamVtkOutput::formatter& fmt,
+        vtk::formatter& fmt,
         const FixedList<Type, Size>& lst
     );
 
@@ -119,7 +112,7 @@ namespace foamVtkOutput
     template<class Type>
     void writeList
     (
-        foamVtkOutput::formatter& fmt,
+        vtk::formatter& fmt,
         const UList<Type>& lst,
         const UList<label>& addressing
     );
@@ -136,10 +129,10 @@ namespace legacy
   // Constants
 
     //- Strings corresponding to the (POLYDATA, UNSTRUCTURED_GRID) elements
-    extern const Foam::Enum<vtkFileTag> contentNames;
+    extern const Foam::Enum<vtk::fileTag> contentNames;
 
     //- Strings corresponding to the (CELL_DATA, POINT_DATA) elements
-    extern const Foam::Enum<vtkFileTag> dataTypeNames;
+    extern const Foam::Enum<vtk::fileTag> dataTypeNames;
 
 
   // Functions
@@ -158,9 +151,9 @@ namespace legacy
     //  Includes "DATASET" with the specified dataset type.
     inline void fileHeader
     (
-        foamVtkOutput::formatter& fmt,
+        vtk::formatter& fmt,
         const std::string& title,
-        const vtkFileTag& contentTypeTag
+        const vtk::fileTag& contentTypeTag
     );
 
     //- Emit header for legacy file, with "ASCII" or "BINARY" depending on
@@ -168,7 +161,7 @@ namespace legacy
     //  If the contentType is non-empty, it is used for "DATASET" line.
     std::ostream& fileHeader
     (
-        foamVtkOutput::formatter& fmt,
+        vtk::formatter& fmt,
         const std::string& title,
         const std::string& contentType
     );
@@ -189,14 +182,14 @@ namespace legacy
     );
 
 
-    //- Use the enumerations vtkFileTag::CELL_DATA, vtkFileTag::POINT_DATA,
+    //- Use the enumerations vtk::fileTag::CELL_DATA, vtk::fileTag::POINT_DATA,
     //  to emit a legacy CELL_DATA, POINT_DATA element.
     //  The nEntries corresponds similarly to the number of cells or points,
     //  respectively.
     inline void dataHeader
     (
         std::ostream& os,
-        const vtkFileTag& dataTypeTag,
+        const vtk::fileTag& dataTypeTag,
         const label nEntries,
         const label nFields
     );
@@ -219,11 +212,12 @@ namespace legacy
         const label nEntries
     );
 
-};
+} // End namespace legacy
+
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 
diff --git a/src/fileFormats/vtk/output/foamVtkOutputI.H b/src/fileFormats/vtk/output/foamVtkOutputI.H
index 192caea831..9618bae2ab 100644
--- a/src/fileFormats/vtk/output/foamVtkOutputI.H
+++ b/src/fileFormats/vtk/output/foamVtkOutputI.H
@@ -27,12 +27,12 @@ License
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 //- Template specialization for label
 template<>
-inline void write<label>(foamVtkOutput::formatter& fmt, const label& val)
+inline void write<label>(vtk::formatter& fmt, const label& val)
 {
     fmt.write(val);
 }
@@ -40,7 +40,7 @@ inline void write<label>(foamVtkOutput::formatter& fmt, const label& val)
 
 //- Template specialization for float
 template<>
-inline void write<float>(foamVtkOutput::formatter& fmt, const float& val)
+inline void write<float>(vtk::formatter& fmt, const float& val)
 {
     fmt.write(val);
 }
@@ -48,18 +48,18 @@ inline void write<float>(foamVtkOutput::formatter& fmt, const float& val)
 
 //- Template specialization for double
 template<>
-inline void write<double>(foamVtkOutput::formatter& fmt, const double& val)
+inline void write<double>(vtk::formatter& fmt, const double& val)
 {
     fmt.write(val);
 }
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 
 // * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * * //
 
-inline std::ostream& Foam::foamVtkOutput::legacy::fileHeader
+inline std::ostream& Foam::vtk::legacy::fileHeader
 (
     std::ostream& os,
     const std::string& title,
@@ -74,18 +74,18 @@ inline std::ostream& Foam::foamVtkOutput::legacy::fileHeader
 }
 
 
-inline void Foam::foamVtkOutput::legacy::fileHeader
+inline void Foam::vtk::legacy::fileHeader
 (
-    foamVtkOutput::formatter& fmt,
+    vtk::formatter& fmt,
     const std::string& title,
-    const vtkFileTag& contentTypeTag
+    const vtk::fileTag& contentTypeTag
 )
 {
     fileHeader(fmt, title, contentNames[contentTypeTag]);
 }
 
 
-inline void Foam::foamVtkOutput::legacy::beginPoints
+inline void Foam::vtk::legacy::beginPoints
 (
     std::ostream& os,
     const label nPoints
@@ -95,7 +95,7 @@ inline void Foam::foamVtkOutput::legacy::beginPoints
 }
 
 
-inline void Foam::foamVtkOutput::legacy::beginPolys
+inline void Foam::vtk::legacy::beginPolys
 (
     std::ostream& os,
     const label nPolys,
@@ -106,10 +106,10 @@ inline void Foam::foamVtkOutput::legacy::beginPolys
 }
 
 
-inline void Foam::foamVtkOutput::legacy::dataHeader
+inline void Foam::vtk::legacy::dataHeader
 (
     std::ostream& os,
-    const vtkFileTag& dataTypeTag,
+    const vtk::fileTag& dataTypeTag,
     const label nEntries,
     const label nFields
 )
@@ -119,7 +119,7 @@ inline void Foam::foamVtkOutput::legacy::dataHeader
 }
 
 
-inline void Foam::foamVtkOutput::legacy::floatField
+inline void Foam::vtk::legacy::floatField
 (
     std::ostream& os,
     const word& fieldName,
@@ -131,7 +131,7 @@ inline void Foam::foamVtkOutput::legacy::floatField
 }
 
 
-inline void Foam::foamVtkOutput::legacy::intField
+inline void Foam::vtk::legacy::intField
 (
     std::ostream& os,
     const word& fieldName,
diff --git a/src/fileFormats/vtk/output/foamVtkOutputOptions.C b/src/fileFormats/vtk/output/foamVtkOutputOptions.C
index d58cf3849b..8a8c30a060 100644
--- a/src/fileFormats/vtk/output/foamVtkOutputOptions.C
+++ b/src/fileFormats/vtk/output/foamVtkOutputOptions.C
@@ -28,8 +28,8 @@ License
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::outputOptions::ascii(bool on)
+Foam::vtk::outputOptions&
+Foam::vtk::outputOptions::ascii(bool on)
 {
     if (on)
     {
@@ -76,8 +76,8 @@ Foam::foamVtkOutput::outputOptions::ascii(bool on)
 }
 
 
-Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::outputOptions::append(bool on)
+Foam::vtk::outputOptions&
+Foam::vtk::outputOptions::append(bool on)
 {
     if (on)
     {
@@ -118,8 +118,8 @@ Foam::foamVtkOutput::outputOptions::append(bool on)
 }
 
 
-Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::outputOptions::legacy(bool on)
+Foam::vtk::outputOptions&
+Foam::vtk::outputOptions::legacy(bool on)
 {
     if (on)
     {
@@ -160,15 +160,15 @@ Foam::foamVtkOutput::outputOptions::legacy(bool on)
 }
 
 
-Foam::foamVtkOutput::outputOptions&
-Foam::foamVtkOutput::outputOptions::precision(unsigned prec)
+Foam::vtk::outputOptions&
+Foam::vtk::outputOptions::precision(unsigned prec)
 {
     precision_ = prec;
     return *this;
 }
 
 
-Foam::string Foam::foamVtkOutput::outputOptions::description() const
+Foam::string Foam::vtk::outputOptions::description() const
 {
     switch (fmtType_)
     {
diff --git a/src/fileFormats/vtk/output/foamVtkOutputOptions.H b/src/fileFormats/vtk/output/foamVtkOutputOptions.H
index c93dbd5f1f..00e715b15c 100644
--- a/src/fileFormats/vtk/output/foamVtkOutputOptions.H
+++ b/src/fileFormats/vtk/output/foamVtkOutputOptions.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::foamVtkOutput::outputOptions
+    Foam::vtk::outputOptions
 
 Description
     Encapsulated combinations of output format options.
@@ -47,7 +47,7 @@ SourceFiles
 
 namespace Foam
 {
-namespace foamVtkOutput
+namespace vtk
 {
 
 /*---------------------------------------------------------------------------*\
@@ -148,7 +148,7 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
diff --git a/src/fileFormats/vtk/output/foamVtkOutputOptionsI.H b/src/fileFormats/vtk/output/foamVtkOutputOptionsI.H
index 7d398ee7ea..c8802c3da8 100644
--- a/src/fileFormats/vtk/output/foamVtkOutputOptionsI.H
+++ b/src/fileFormats/vtk/output/foamVtkOutputOptionsI.H
@@ -28,14 +28,14 @@ License
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-inline Foam::foamVtkOutput::outputOptions::outputOptions()
+inline Foam::vtk::outputOptions::outputOptions()
 :
     fmtType_(formatType::INLINE_ASCII),
     precision_(IOstream::defaultPrecision())
 {}
 
 
-inline Foam::foamVtkOutput::outputOptions::outputOptions
+inline Foam::vtk::outputOptions::outputOptions
 (
     enum formatType fmtType
 )
@@ -47,23 +47,23 @@ inline Foam::foamVtkOutput::outputOptions::outputOptions
 
 // * * * * * * * * * * * * * * * * Selectors * * * * * * * * * * * * * * * * //
 
-inline Foam::autoPtr<Foam::foamVtkOutput::formatter>
-Foam::foamVtkOutput::outputOptions::newFormatter(std::ostream& os) const
+inline Foam::autoPtr<Foam::vtk::formatter>
+Foam::vtk::outputOptions::newFormatter(std::ostream& os) const
 {
-    return foamVtkOutput::newFormatter(os, fmtType_, precision_);
+    return vtk::newFormatter(os, fmtType_, precision_);
 }
 
 
 // * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * * //
 
-inline Foam::foamVtkOutput::formatType
-Foam::foamVtkOutput::outputOptions::fmt() const
+inline Foam::vtk::formatType
+Foam::vtk::outputOptions::fmt() const
 {
     return fmtType_;
 }
 
 
-inline bool Foam::foamVtkOutput::outputOptions::legacy() const
+inline bool Foam::vtk::outputOptions::legacy() const
 {
     return
     (
@@ -73,13 +73,13 @@ inline bool Foam::foamVtkOutput::outputOptions::legacy() const
 }
 
 
-inline bool Foam::foamVtkOutput::outputOptions::xml() const
+inline bool Foam::vtk::outputOptions::xml() const
 {
     return !legacy();
 }
 
 
-inline bool Foam::foamVtkOutput::outputOptions::append() const
+inline bool Foam::vtk::outputOptions::append() const
 {
     return
     (
@@ -89,19 +89,19 @@ inline bool Foam::foamVtkOutput::outputOptions::append() const
 }
 
 
-inline bool Foam::foamVtkOutput::outputOptions::insitu() const
+inline bool Foam::vtk::outputOptions::insitu() const
 {
     return !append();
 }
 
 
-inline bool Foam::foamVtkOutput::outputOptions::ascii() const
+inline bool Foam::vtk::outputOptions::ascii() const
 {
     return !(unsigned(fmtType_) & 0x0F);
 }
 
 
-inline unsigned Foam::foamVtkOutput::outputOptions::precision() const
+inline unsigned Foam::vtk::outputOptions::precision() const
 {
     return precision_;
 }
diff --git a/src/fileFormats/vtk/output/foamVtkOutputTemplates.C b/src/fileFormats/vtk/output/foamVtkOutputTemplates.C
index f565602b6c..a60d01e52e 100644
--- a/src/fileFormats/vtk/output/foamVtkOutputTemplates.C
+++ b/src/fileFormats/vtk/output/foamVtkOutputTemplates.C
@@ -26,9 +26,9 @@ License
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 template<class Type>
-inline void Foam::foamVtkOutput::write
+inline void Foam::vtk::write
 (
-    foamVtkOutput::formatter& fmt,
+    vtk::formatter& fmt,
     const Type& val
 )
 {
@@ -40,9 +40,9 @@ inline void Foam::foamVtkOutput::write
 
 
 template<class Type>
-void Foam::foamVtkOutput::writeList
+void Foam::vtk::writeList
 (
-    foamVtkOutput::formatter& fmt,
+    vtk::formatter& fmt,
     const UList<Type>& lst
 )
 {
@@ -54,9 +54,9 @@ void Foam::foamVtkOutput::writeList
 
 
 template<class Type, unsigned Size>
-void Foam::foamVtkOutput::writeList
+void Foam::vtk::writeList
 (
-    foamVtkOutput::formatter& fmt,
+    vtk::formatter& fmt,
     const FixedList<Type, Size>& lst
 )
 {
@@ -68,9 +68,9 @@ void Foam::foamVtkOutput::writeList
 
 
 template<class Type>
-void Foam::foamVtkOutput::writeList
+void Foam::vtk::writeList
 (
-    foamVtkOutput::formatter& fmt,
+    vtk::formatter& fmt,
     const UList<Type>& lst,
     const UList<label>& addressing
 )
diff --git a/src/fileFormats/vtk/read/vtkUnstructuredReader.C b/src/fileFormats/vtk/read/vtkUnstructuredReader.C
index 153c165782..f29d57995c 100644
--- a/src/fileFormats/vtk/read/vtkUnstructuredReader.C
+++ b/src/fileFormats/vtk/read/vtkUnstructuredReader.C
@@ -125,7 +125,7 @@ void Foam::vtkUnstructuredReader::extractCells
     {
         switch (cellTypes[i])
         {
-            case foamVtkCore::VTK_VERTEX:
+            case vtk::cellType::VTK_VERTEX:
             {
                 warnUnhandledType(inFile, cellTypes[i], warningGiven);
                 label nRead = cellVertData[dataIndex++];
@@ -141,7 +141,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_POLY_VERTEX:
+            case vtk::cellType::VTK_POLY_VERTEX:
             {
                 warnUnhandledType(inFile, cellTypes[i], warningGiven);
                 label nRead = cellVertData[dataIndex++];
@@ -149,7 +149,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_LINE:
+            case vtk::cellType::VTK_LINE:
             {
                 //warnUnhandledType(inFile, cellTypes[i], warningGiven);
                 label nRead = cellVertData[dataIndex++];
@@ -169,7 +169,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_POLY_LINE:
+            case vtk::cellType::VTK_POLY_LINE:
             {
                 //warnUnhandledType(inFile, cellTypes[i], warningGiven);
                 label nRead = cellVertData[dataIndex++];
@@ -183,7 +183,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_TRIANGLE:
+            case vtk::cellType::VTK_TRIANGLE:
             {
                 faceMap_[facei] = i;
                 face& f = faces_[facei++];
@@ -203,7 +203,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_QUAD:
+            case vtk::cellType::VTK_QUAD:
             {
                 faceMap_[facei] = i;
                 face& f = faces_[facei++];
@@ -224,7 +224,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_POLYGON:
+            case vtk::cellType::VTK_POLYGON:
             {
                 faceMap_[facei] = i;
                 face& f = faces_[facei++];
@@ -237,7 +237,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_TETRA:
+            case vtk::cellType::VTK_TETRA:
             {
                 label nRead = cellVertData[dataIndex++];
                 if (nRead != 4)
@@ -257,7 +257,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_PYRAMID:
+            case vtk::cellType::VTK_PYRAMID:
             {
                 label nRead = cellVertData[dataIndex++];
                 if (nRead != 5)
@@ -278,7 +278,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_WEDGE:
+            case vtk::cellType::VTK_WEDGE:
             {
                 label nRead = cellVertData[dataIndex++];
                 if (nRead != 6)
@@ -300,7 +300,7 @@ void Foam::vtkUnstructuredReader::extractCells
             }
             break;
 
-            case foamVtkCore::VTK_HEXAHEDRON:
+            case vtk::cellType::VTK_HEXAHEDRON:
             {
                 label nRead = cellVertData[dataIndex++];
                 if (nRead != 8)
diff --git a/src/fileFormats/vtk/read/vtkUnstructuredReader.H b/src/fileFormats/vtk/read/vtkUnstructuredReader.H
index 48dc38890a..bee79496c6 100644
--- a/src/fileFormats/vtk/read/vtkUnstructuredReader.H
+++ b/src/fileFormats/vtk/read/vtkUnstructuredReader.H
@@ -63,8 +63,6 @@ namespace Foam
 \*---------------------------------------------------------------------------*/
 
 class vtkUnstructuredReader
-:
-    public fileFormats::foamVtkCore
 {
 public:
 
@@ -206,7 +204,7 @@ private:
 
         void read(ISstream& inFile);
 
-        //- Dissallow assignment
+        //- Disallow assignment
         void operator=(const vtkUnstructuredReader&);
 
 
@@ -220,6 +218,7 @@ public:
         //- Construct from Istream, read all
         vtkUnstructuredReader(const objectRegistry& obr, ISstream&);
 
+
     // Member Functions
 
         //- Header
diff --git a/src/fileFormats/vtk/type/foamVtkFileEnums.C b/src/fileFormats/vtk/type/foamVtkFileEnums.C
deleted file mode 100644
index bf9d0d5cd3..0000000000
--- a/src/fileFormats/vtk/type/foamVtkFileEnums.C
+++ /dev/null
@@ -1,64 +0,0 @@
-/*---------------------------------------------------------------------------*\
-  =========                 |
-  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
-   \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
-     \\/     M anipulation  |
--------------------------------------------------------------------------------
-License
-    This file is part of OpenFOAM.
-
-    OpenFOAM is free software: you can redistribute it and/or modify it
-    under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
-    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-    for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
-
-\*---------------------------------------------------------------------------*/
-
-#include "foamVtkFileEnums.H"
-#include "Enum.H"
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-const Foam::Enum<Foam::vtkFileTag> Foam::vtkFileTagNames
-(
-    vtkFileTag::VTK_FILE,
-    {
-        "VTKFile",
-        "DataArray",
-        "Piece",
-        "DataSet",
-        "Points",
-        "Cells",
-        "Polys",
-        "Verts",
-        "CellData",
-        "PointData",
-        "PolyData",
-        "UnstructuredGrid",
-    }
-);
-
-
-const Foam::Enum<Foam::vtkFileAttr> Foam::vtkFileAttrNames
-(
-    vtkFileAttr::OFFSET,
-    {
-        "offset",
-        "NumberOfPoints",
-        "NumberOfCells",
-        "NumberOfPolys",
-        "NumberOfVerts"
-    }
-);
-
-
-// ************************************************************************* //
diff --git a/src/fileFormats/vtk/type/foamVtkFileEnums.H b/src/fileFormats/vtk/type/foamVtkFileEnums.H
deleted file mode 100644
index cb683661c0..0000000000
--- a/src/fileFormats/vtk/type/foamVtkFileEnums.H
+++ /dev/null
@@ -1,90 +0,0 @@
-/*---------------------------------------------------------------------------*\
-  =========                 |
-  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
-   \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
-     \\/     M anipulation  |
--------------------------------------------------------------------------------
-License
-    This file is part of OpenFOAM.
-
-    OpenFOAM is free software: you can redistribute it and/or modify it
-    under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
-    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-    for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
-
-InNamespace
-    Foam::foam
-
-Description
-    Enumerations for commonly used VTK file items.
-
-SourceFiles
-    foamVtkFileEnums.C
-
-\*---------------------------------------------------------------------------*/
-
-#ifndef foamVtkFileEnums_H
-#define foamVtkFileEnums_H
-
-#include "Enum.H"
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-namespace Foam
-{
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-//- Some common XML tags for vtk files
-enum class vtkFileTag
-{
-    VTK_FILE,           //!< "VTKFile"
-    DATA_ARRAY,         //!< "DataArray"
-    PIECE,              //!< "Piece"
-    DATA_SET,           //!< "DataSet"
-    POINTS,             //!< "Points"
-    CELLS,              //!< "Cells"
-    POLYS,              //!< "Polys"
-    VERTS,              //!< "Verts"
-    CELL_DATA,          //!< "CellData"
-    POINT_DATA,         //!< "PointData"
-    POLY_DATA,          //!< "PolyData"
-    UNSTRUCTURED_GRID,  //!< "UnstructuredGrid"
-};
-
-//- Strings corresponding to the elements
-extern const Foam::Enum<vtkFileTag> vtkFileTagNames;
-
-
-//- Some common XML attributes for vtk files
-enum class vtkFileAttr
-{
-    OFFSET,             //!< "offset"
-    NUMBER_OF_POINTS,   //!< "NumberOfPoints"
-    NUMBER_OF_CELLS,    //!< "NumberOfCells"
-    NUMBER_OF_POLYS,    //!< "NumberOfPolys"
-    NUMBER_OF_VERTS,    //!< "NumberOfVerts"
-};
-
-//- Strings corresponding to the elements
-extern const Foam::Enum<vtkFileAttr> vtkFileAttrNames;
-
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-} // End namespace Foam
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-#endif
-
-// ************************************************************************* //
diff --git a/src/fileFormats/vtk/type/foamVtkOutputTypes.H b/src/fileFormats/vtk/type/foamVtkOutputTypes.H
deleted file mode 100644
index 3eab6006f8..0000000000
--- a/src/fileFormats/vtk/type/foamVtkOutputTypes.H
+++ /dev/null
@@ -1,77 +0,0 @@
-/*---------------------------------------------------------------------------*\
-  =========                 |
-  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
-   \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
-     \\/     M anipulation  |
--------------------------------------------------------------------------------
-License
-    This file is part of OpenFOAM.
-
-    OpenFOAM is free software: you can redistribute it and/or modify it
-    under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
-    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
-    for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
-
-InNamespace
-    Foam::foamVtkOutput
-
-Description
-    Enumerations and typedefs for VTK output.
-
-SourceFiles
-    foamVtkOutputTypes.H
-
-\*---------------------------------------------------------------------------*/
-
-#ifndef foamVtkOutputTypes_H
-#define foamVtkOutputTypes_H
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-namespace Foam
-{
-namespace foamVtkOutput
-{
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-  // Enumerations
-
-    //- The output format type for file contents.
-    //  Upper bits for output type, lower bits for the format itself.
-    enum class formatType
-    {
-        /** XML inline ASCII, using the asciiFormatter */
-        INLINE_ASCII  = 0,
-        /** XML inline base64, using the base64Formatter */
-        INLINE_BASE64 = 0x01,
-        /** XML append base64, using the appendBase64Formatter */
-        APPEND_BASE64 = 0x11,
-        /** XML append raw binary, using the appendRawFormatter */
-        APPEND_BINARY = 0x12,
-        /** Legacy ASCII, using the legacyAsciiFormatter */
-        LEGACY_ASCII  = 0x20,
-        /** Legacy raw binary, using the legacyRawFormatter */
-        LEGACY_BINARY = 0x22,
-    };
-
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-} // End namespace foamVtkOutput
-} // End namespace Foam
-
-// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
-
-#endif
-
-// ************************************************************************* //
diff --git a/src/functionObjects/utilities/writeVTK/writeVTK.C b/src/functionObjects/utilities/writeVTK/writeVTK.C
index 2fe616effd..ab56d294fd 100644
--- a/src/functionObjects/utilities/writeVTK/writeVTK.C
+++ b/src/functionObjects/utilities/writeVTK/writeVTK.C
@@ -115,20 +115,20 @@ bool Foam::functionObjects::writeVTK::write()
 
     Info<< "    Internal  : " << outputName << endl;
 
-    foamVtkCells foamVtkMeshCells
+    vtk::vtuCells meshCells
     (
         mesh_,
-        foamVtkCells::contentType::LEGACY,
+        vtk::vtuCells::contentType::LEGACY,
         true  // decompose
     );
 
     // Write mesh
-    foamVtkOutput::internalWriter writer
+    vtk::internalWriter writer
     (
         mesh_,
-        foamVtkMeshCells,
+        meshCells,
         outputName,
-        foamVtkOutput::formatType::LEGACY_ASCII
+        vtk::formatType::LEGACY_ASCII
     );
 
 
diff --git a/src/meshTools/output/foamVtkWriteCellSetFaces.C b/src/meshTools/output/foamVtkWriteCellSetFaces.C
index 02d3e5a11f..a84b5d5b70 100644
--- a/src/meshTools/output/foamVtkWriteCellSetFaces.C
+++ b/src/meshTools/output/foamVtkWriteCellSetFaces.C
@@ -32,12 +32,12 @@ License
 
 // * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::writeCellSetFaces
+void Foam::vtk::writeCellSetFaces
 (
     const primitiveMesh& mesh,
     const cellSet& set,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts
+    const vtk::outputOptions outOpts
 )
 {
     outputOptions opts(outOpts);
@@ -47,11 +47,11 @@ void Foam::foamVtkOutput::writeCellSetFaces
 
     std::ofstream os((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
 
-    autoPtr<foamVtkOutput::formatter> format = opts.newFormatter(os);
+    autoPtr<vtk::formatter> format = opts.newFormatter(os);
 
     if (legacy_)
     {
-        legacy::fileHeader(format(), set.name(), vtkFileTag::POLY_DATA);
+        legacy::fileHeader(format(), set.name(), vtk::fileTag::POLY_DATA);
     }
 
     //-------------------------------------------------------------------------
@@ -109,7 +109,7 @@ void Foam::foamVtkOutput::writeCellSetFaces
     // Write points and faces as polygons
     legacy::beginPoints(os, pp.nPoints());
 
-    foamVtkOutput::writeList(format(), pp.localPoints());
+    vtk::writeList(format(), pp.localPoints());
     format().flush();
 
     // connectivity count without additional storage (done internally)
@@ -129,17 +129,17 @@ void Foam::foamVtkOutput::writeCellSetFaces
         const face& f = pp.localFaces()[facei];
 
         format().write(f.size());  // The size prefix
-        foamVtkOutput::writeList(format(), f);
+        vtk::writeList(format(), f);
     }
     format().flush();
 
 
     // Write data - faceId/cellId
-    legacy::dataHeader(os, vtkFileTag::CELL_DATA, pp.size(), 1);
+    legacy::dataHeader(os, vtk::fileTag::CELL_DATA, pp.size(), 1);
 
     os << "cellID 1 " << pp.size() << " int" << nl;
 
-    foamVtkOutput::writeList(format(), faceValues);
+    vtk::writeList(format(), faceValues);
     format().flush();
 }
 
diff --git a/src/meshTools/output/foamVtkWriteCellSetFaces.H b/src/meshTools/output/foamVtkWriteCellSetFaces.H
index 047f4b16f8..765ff60807 100644
--- a/src/meshTools/output/foamVtkWriteCellSetFaces.H
+++ b/src/meshTools/output/foamVtkWriteCellSetFaces.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 InNamespace
-    Foam::foamVtkOutput
+    Foam::vtk
 
 Description
     Write faces of cellSet to vtk polydata file.
@@ -45,11 +45,11 @@ SourceFiles
 
 namespace Foam
 {
- class primitiveMesh;
+class primitiveMesh;
 class cellSet;
 class fileName;
 
-namespace foamVtkOutput
+namespace vtk
 {
 
 //- Write perimeter faces of cellset to vtk polydata file.
@@ -59,10 +59,10 @@ void writeCellSetFaces
     const primitiveMesh& mesh,
     const cellSet& set,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts
+    const vtk::outputOptions outOpts
 );
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 
diff --git a/src/meshTools/output/foamVtkWriteFaceSet.C b/src/meshTools/output/foamVtkWriteFaceSet.C
index 86d45e9ae8..59c11329d4 100644
--- a/src/meshTools/output/foamVtkWriteFaceSet.C
+++ b/src/meshTools/output/foamVtkWriteFaceSet.C
@@ -32,12 +32,12 @@ License
 
 // * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::writeFaceSet
+void Foam::vtk::writeFaceSet
 (
     const primitiveMesh& mesh,
     const faceSet& set,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts
+    const vtk::outputOptions outOpts
 )
 {
     outputOptions opts(outOpts);
@@ -47,11 +47,11 @@ void Foam::foamVtkOutput::writeFaceSet
 
     std::ofstream os((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
 
-    autoPtr<foamVtkOutput::formatter> format = opts.newFormatter(os);
+    autoPtr<vtk::formatter> format = opts.newFormatter(os);
 
     if (legacy_)
     {
-        legacy::fileHeader(format(), set.name(), vtkFileTag::POLY_DATA);
+        legacy::fileHeader(format(), set.name(), vtk::fileTag::POLY_DATA);
     }
 
     //-------------------------------------------------------------------------
@@ -70,7 +70,7 @@ void Foam::foamVtkOutput::writeFaceSet
     // Write points and faces as polygons
     legacy::beginPoints(os, pp.nPoints());
 
-    foamVtkOutput::writeList(format(), pp.localPoints());
+    vtk::writeList(format(), pp.localPoints());
     format().flush();
 
     // connectivity count without additional storage (done internally)
@@ -89,18 +89,18 @@ void Foam::foamVtkOutput::writeFaceSet
         const face& f = pp.localFaces()[facei];
 
         format().write(f.size());  // The size prefix
-        foamVtkOutput::writeList(format(), f);
+        vtk::writeList(format(), f);
     }
     format().flush();
 
 
     // Write data - faceId/cellId
 
-    legacy::dataHeader(os, vtkFileTag::CELL_DATA, pp.size(), 1);
+    legacy::dataHeader(os, vtk::fileTag::CELL_DATA, pp.size(), 1);
 
     os << "faceID 1 " << pp.size() << " int" << nl;
 
-    foamVtkOutput::writeList(format(), faceLabels);
+    vtk::writeList(format(), faceLabels);
     format().flush();
 }
 
diff --git a/src/meshTools/output/foamVtkWriteFaceSet.H b/src/meshTools/output/foamVtkWriteFaceSet.H
index d709b0a681..24ba0c3932 100644
--- a/src/meshTools/output/foamVtkWriteFaceSet.H
+++ b/src/meshTools/output/foamVtkWriteFaceSet.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 InNamespace
-    Foam::foamVtkOutput
+    Foam::vtk
 
 Description
     Write faceSet to vtk polydata file.
@@ -46,7 +46,7 @@ class primitiveMesh;
 class faceSet;
 class fileName;
 
-namespace foamVtkOutput
+namespace vtk
 {
 
 //- Write pointSet to vtk polydata file.
@@ -56,11 +56,11 @@ void writeFaceSet
     const primitiveMesh& mesh,
     const faceSet& set,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts
+    const vtk::outputOptions outOpts
 );
 
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 
diff --git a/src/meshTools/output/foamVtkWritePointSet.C b/src/meshTools/output/foamVtkWritePointSet.C
index f3a9b7e115..66cbfc8c44 100644
--- a/src/meshTools/output/foamVtkWritePointSet.C
+++ b/src/meshTools/output/foamVtkWritePointSet.C
@@ -31,12 +31,12 @@ License
 
 // * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //
 
-void Foam::foamVtkOutput::writePointSet
+void Foam::vtk::writePointSet
 (
     const primitiveMesh& mesh,
     const pointSet& set,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts
+    const vtk::outputOptions outOpts
 )
 {
     outputOptions opts(outOpts);
@@ -46,11 +46,11 @@ void Foam::foamVtkOutput::writePointSet
 
     std::ofstream os((baseName + (legacy_ ? ".vtk" : ".vtp")).c_str());
 
-    autoPtr<foamVtkOutput::formatter> format = opts.newFormatter(os);
+    autoPtr<vtk::formatter> format = opts.newFormatter(os);
 
     if (legacy_)
     {
-        legacy::fileHeader(format(), set.name(), vtkFileTag::POLY_DATA);
+        legacy::fileHeader(format(), set.name(), vtk::fileTag::POLY_DATA);
     }
 
     //-------------------------------------------------------------------------
@@ -60,15 +60,15 @@ void Foam::foamVtkOutput::writePointSet
     // Write points
     legacy::beginPoints(os, pointLabels.size());
 
-    foamVtkOutput::writeList(format(), mesh.points(), pointLabels);
+    vtk::writeList(format(), mesh.points(), pointLabels);
     format().flush();
 
     // Write data - pointID
-    legacy::dataHeader(os, vtkFileTag::POINT_DATA, pointLabels.size(), 1);
+    legacy::dataHeader(os, vtk::fileTag::POINT_DATA, pointLabels.size(), 1);
 
     os << "pointID 1 " << pointLabels.size() << " int" << nl;
 
-    foamVtkOutput::writeList(format(), pointLabels);
+    vtk::writeList(format(), pointLabels);
     format().flush();
 }
 
diff --git a/src/meshTools/output/foamVtkWritePointSet.H b/src/meshTools/output/foamVtkWritePointSet.H
index 3ceda2914e..830dfd304a 100644
--- a/src/meshTools/output/foamVtkWritePointSet.H
+++ b/src/meshTools/output/foamVtkWritePointSet.H
@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 InNamespace
-    Foam::foamVtkOutput
+    Foam::vtk
 
 Description
     Write pointSet to vtk polydata file.
@@ -46,7 +46,7 @@ class primitiveMesh;
 class pointSet;
 class fileName;
 
-namespace foamVtkOutput
+namespace vtk
 {
 
 //- Write pointSet to vtk polydata file.
@@ -56,11 +56,11 @@ void writePointSet
     const primitiveMesh& mesh,
     const pointSet& set,
     const fileName& baseName,
-    const foamVtkOutput::outputOptions outOpts
+    const vtk::outputOptions outOpts
 );
 
 
-} // End namespace foamVtkOutput
+} // End namespace vtk
 } // End namespace Foam
 
 
diff --git a/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormat.C b/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormat.C
index 98fed44463..b7141105d6 100644
--- a/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormat.C
+++ b/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormat.C
@@ -37,9 +37,9 @@ License
 // TODO: make this run-time selectable (ASCII | BINARY)
 // - Legacy mode only
 
-static const Foam::foamVtkOutput::formatType fmtType =
-    Foam::foamVtkOutput::formatType::LEGACY_ASCII;
-    // Foam::foamVtkOutput::formatType::LEGACY_BASE64;
+static const Foam::vtk::formatType fmtType =
+    Foam::vtk::formatType::LEGACY_ASCII;
+    // Foam::vtk::formatType::LEGACY_BINARY;
 
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
@@ -47,7 +47,7 @@ static const Foam::foamVtkOutput::formatType fmtType =
 template<class Face>
 void Foam::fileFormats::VTKsurfaceFormat<Face>::writePolys
 (
-    foamVtkOutput::formatter& format,
+    vtk::formatter& format,
     const UList<Face>& faces
 )
 {
@@ -58,7 +58,7 @@ void Foam::fileFormats::VTKsurfaceFormat<Face>::writePolys
         nConnectivity += f.size();
     }
 
-    foamVtkOutput::legacy::beginPolys
+    vtk::legacy::beginPolys
     (
         format.os(),
         faces.size(),
@@ -72,7 +72,7 @@ void Foam::fileFormats::VTKsurfaceFormat<Face>::writePolys
     for (const Face& f : faces)
     {
         format.write(f.size());  // The size prefix
-        foamVtkOutput::writeList(format, f);
+        vtk::writeList(format, f);
     }
 
     format.flush();
@@ -276,8 +276,8 @@ void Foam::fileFormats::VTKsurfaceFormat<Face>::write
 
     std::ofstream os(filename.c_str());
 
-    autoPtr<foamVtkOutput::formatter> format =
-        foamVtkOutput::newFormatter(os, fmtType);
+    autoPtr<vtk::formatter> format =
+        vtk::newFormatter(os, fmtType);
 
     writeHeader(format(), pointLst);
 
@@ -290,7 +290,7 @@ void Foam::fileFormats::VTKsurfaceFormat<Face>::write
             nConnectivity += f.size();
         }
 
-        foamVtkOutput::legacy::beginPolys
+        vtk::legacy::beginPolys
         (
             format().os(),
             faceLst.size(),
@@ -305,7 +305,7 @@ void Foam::fileFormats::VTKsurfaceFormat<Face>::write
                 const Face& f = faceLst[faceMap[faceIndex++]];
 
                 format().write(f.size());  // The size prefix
-                foamVtkOutput::writeList(format(), f);
+                vtk::writeList(format(), f);
             }
         }
 
@@ -334,8 +334,8 @@ void Foam::fileFormats::VTKsurfaceFormat<Face>::write
 {
     std::ofstream os(filename.c_str());
 
-    autoPtr<foamVtkOutput::formatter> format =
-        foamVtkOutput::newFormatter(os, fmtType);
+    autoPtr<vtk::formatter> format =
+        vtk::newFormatter(os, fmtType);
 
     writeHeader(format(), surf.points());
 
diff --git a/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormat.H b/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormat.H
index cd0fb232a3..9a73aceeb5 100644
--- a/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormat.H
+++ b/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormat.H
@@ -63,7 +63,7 @@ class VTKsurfaceFormat
         //- Write polygons
         static void writePolys
         (
-            foamVtkOutput::formatter& format,
+            vtk::formatter& format,
             const UList<Face>& faces
         );
 
diff --git a/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormatCore.C b/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormatCore.C
index c251e1f621..fe58168e5b 100644
--- a/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormatCore.C
+++ b/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormatCore.C
@@ -31,27 +31,27 @@ License
 
 void Foam::fileFormats::VTKsurfaceFormatCore::writeHeader
 (
-    foamVtkOutput::formatter& format,
+    vtk::formatter& format,
     const pointField& pts
 )
 {
-    foamVtkOutput::legacy::fileHeader
+    vtk::legacy::fileHeader
     (
         format,
         ("surface written " + clock::dateTime()),
-        vtkFileTag::POLY_DATA
+        vtk::fileTag::POLY_DATA
     );
 
-    foamVtkOutput::legacy::beginPoints(format.os(), pts.size());
+    vtk::legacy::beginPoints(format.os(), pts.size());
 
-    foamVtkOutput::writeList(format, pts);
+    vtk::writeList(format, pts);
     format.flush();
 }
 
 
 void Foam::fileFormats::VTKsurfaceFormatCore::writeCellData
 (
-    foamVtkOutput::formatter& format,
+    vtk::formatter& format,
     const UList<surfZone>& zones
 )
 {
@@ -64,15 +64,15 @@ void Foam::fileFormats::VTKsurfaceFormatCore::writeCellData
         nFaces += z.size();
     }
 
-    foamVtkOutput::legacy::dataHeader
+    vtk::legacy::dataHeader
     (
         format.os(),
-        vtkFileTag::CELL_DATA,
+        vtk::fileTag::CELL_DATA,
         nFaces,
         1  // Only one field
     );
 
-    foamVtkOutput::legacy::intField
+    vtk::legacy::intField
     (
         format.os(),
         "region",
@@ -95,7 +95,7 @@ void Foam::fileFormats::VTKsurfaceFormatCore::writeCellData
 
 void Foam::fileFormats::VTKsurfaceFormatCore::writeCellData
 (
-    foamVtkOutput::formatter& format,
+    vtk::formatter& format,
     const labelUList& zoneIds
 )
 {
@@ -104,15 +104,15 @@ void Foam::fileFormats::VTKsurfaceFormatCore::writeCellData
     // Number of faces
     const label nFaces = zoneIds.size();
 
-    foamVtkOutput::legacy::dataHeader
+    vtk::legacy::dataHeader
     (
         format.os(),
-        vtkFileTag::CELL_DATA,
+        vtk::fileTag::CELL_DATA,
         nFaces,
         1  // Only one field
     );
 
-    foamVtkOutput::legacy::intField
+    vtk::legacy::intField
     (
         format.os(),
         "region",
@@ -120,7 +120,7 @@ void Foam::fileFormats::VTKsurfaceFormatCore::writeCellData
         nFaces
     );
 
-    foamVtkOutput::writeList(format, zoneIds);
+    vtk::writeList(format, zoneIds);
     format.flush();
 }
 
diff --git a/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormatCore.H b/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormatCore.H
index 3fdde4da2b..8b09942f87 100644
--- a/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormatCore.H
+++ b/src/surfMesh/surfaceFormats/vtk/VTKsurfaceFormatCore.H
@@ -58,21 +58,21 @@ protected:
         //- Write header information with points
         static void writeHeader
         (
-            foamVtkOutput::formatter& format,
+            vtk::formatter& format,
             const pointField& pts
         );
 
         //- Write regions (zones) information as CellData
         static void writeCellData
         (
-            foamVtkOutput::formatter& format,
+            vtk::formatter& format,
             const UList<surfZone>& zones
         );
 
         //- Write regions (zones) information as CellData
         static void writeCellData
         (
-            foamVtkOutput::formatter& format,
+            vtk::formatter& format,
             const labelUList& zoneIds
         );
 
diff --git a/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormat.C b/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormat.C
index 8a84d1b459..edab564775 100644
--- a/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormat.C
+++ b/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormat.C
@@ -35,9 +35,9 @@ License
 // - No append mode supported
 // - Legacy mode is dispatched via 'VTKsurfaceFormat' instead
 
-static const Foam::foamVtkOutput::formatType fmtType =
-    Foam::foamVtkOutput::formatType::INLINE_ASCII;
-    // Foam::foamVtkOutput::formatType::INLINE_BASE64;
+static const Foam::vtk::formatType fmtType =
+    Foam::vtk::formatType::INLINE_ASCII;
+    // Foam::vtk::formatType::INLINE_BASE64;
 
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
@@ -45,11 +45,11 @@ static const Foam::foamVtkOutput::formatType fmtType =
 template<class Face>
 void Foam::fileFormats::VTPsurfaceFormat<Face>::writePolys
 (
-    foamVtkOutput::formatter& format,
+    vtk::formatter& format,
     const UList<Face>& faces
 )
 {
-    format.tag(vtkFileTag::POLYS);
+    format.tag(vtk::fileTag::POLYS);
 
     //
     // 'connectivity'
@@ -61,14 +61,14 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::writePolys
             payLoad += f.size();
         }
 
-        format.openDataArray<label>("connectivity")
+        format.openDataArray<label>(vtk::dataArrayAttr::CONNECTIVITY)
             .closeTag();
 
         format.writeSize(payLoad * sizeof(label));
 
         for (const Face& f : faces)
         {
-            foamVtkOutput::writeList(format, f);
+            vtk::writeList(format, f);
         }
 
         format.flush();
@@ -83,7 +83,7 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::writePolys
         const uint64_t payLoad(faces.size() * sizeof(label));
 
         format
-            .openDataArray<label>("offsets")
+            .openDataArray<label>(vtk::dataArrayAttr::OFFSETS)
             .closeTag();
 
         format.writeSize(payLoad);
@@ -100,7 +100,7 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::writePolys
         format.endDataArray();
     }
 
-    format.endTag(vtkFileTag::POLYS);
+    format.endTag(vtk::fileTag::POLYS);
 }
 
 
@@ -135,14 +135,14 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::write
 
     std::ofstream os(filename.c_str(), std::ios::binary);
 
-    autoPtr<foamVtkOutput::formatter> format =
-        foamVtkOutput::newFormatter(os, fmtType);
+    autoPtr<vtk::formatter> format =
+        vtk::newFormatter(os, fmtType);
 
     writeHeader(format(), pointLst, faceLst.size());
 
     if (useFaceMap)
     {
-        format().tag(vtkFileTag::POLYS);
+        format().tag(vtk::fileTag::POLYS);
 
         //
         // 'connectivity'
@@ -154,7 +154,7 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::write
                 payLoad += f.size();
             }
 
-            format().openDataArray<label>("connectivity")
+            format().openDataArray<label>(vtk::dataArrayAttr::CONNECTIVITY)
                 .closeTag();
 
             format().writeSize(payLoad * sizeof(label));
@@ -166,7 +166,7 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::write
                 {
                     const Face& f = faceLst[faceMap[faceIndex++]];
 
-                    foamVtkOutput::writeList(format(), f);
+                    vtk::writeList(format(), f);
                 }
             }
 
@@ -182,7 +182,7 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::write
             const uint64_t payLoad(faceLst.size() * sizeof(label));
 
             format()
-                .openDataArray<label>("offsets")
+                .openDataArray<label>(vtk::dataArrayAttr::OFFSETS)
                     .closeTag();
 
             format().writeSize(payLoad);
@@ -204,7 +204,7 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::write
             format().endDataArray();
         }
 
-        format().endTag(vtkFileTag::POLYS);
+        format().endTag(vtk::fileTag::POLYS);
     }
     else
     {
@@ -231,8 +231,8 @@ void Foam::fileFormats::VTPsurfaceFormat<Face>::write
 {
     std::ofstream os(filename.c_str(), std::ios::binary);
 
-    autoPtr<foamVtkOutput::formatter> format =
-        foamVtkOutput::newFormatter(os, fmtType);
+    autoPtr<vtk::formatter> format =
+        vtk::newFormatter(os, fmtType);
 
     const List<Face>& faceLst = surf.surfFaces();
 
diff --git a/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormat.H b/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormat.H
index 1b4b4c642a..ebc35eca08 100644
--- a/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormat.H
+++ b/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormat.H
@@ -63,7 +63,7 @@ class VTPsurfaceFormat
         //- Write polygons
         static void writePolys
         (
-            foamVtkOutput::formatter& format,
+            vtk::formatter& format,
             const UList<Face>& faces
         );
 
diff --git a/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormatCore.C b/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormatCore.C
index 332b4e1b85..947b77d32f 100644
--- a/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormatCore.C
+++ b/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormatCore.C
@@ -31,7 +31,7 @@ License
 
 void Foam::fileFormats::VTPsurfaceFormatCore::writeHeader
 (
-    foamVtkOutput::formatter& format,
+    vtk::formatter& format,
     const pointField& pts,
     const label nFaces
 )
@@ -41,13 +41,13 @@ void Foam::fileFormats::VTPsurfaceFormatCore::writeHeader
     format
         .xmlHeader()
         .xmlComment("surface written " + clock::dateTime())
-        .beginVTKFile(vtkFileTag::POLY_DATA, "0.1");
+        .beginVTKFile(vtk::fileTag::POLY_DATA, "0.1");
 
     // <Piece>
     format
-        .openTag(vtkFileTag::PIECE)
-        ( "NumberOfPoints", pts.size() )
-        ( "NumberOfPolys",  nFaces )
+        .openTag(vtk::fileTag::PIECE)
+        .xmlAttr(vtk::fileAttr::NUMBER_OF_POINTS, pts.size())
+        .xmlAttr(vtk::fileAttr::NUMBER_OF_POLYS,  nFaces)
         .closeTag();
 
 
@@ -55,29 +55,29 @@ void Foam::fileFormats::VTPsurfaceFormatCore::writeHeader
 
     const uint64_t payLoad = (pts.size()*3* sizeof(float));
 
-    format.tag(vtkFileTag::POINTS)
-        .openDataArray<float, 3>(vtkFileTag::POINTS)
+    format.tag(vtk::fileTag::POINTS)
+        .openDataArray<float, 3>(vtk::dataArrayAttr::POINTS)
         .closeTag();
 
     format.writeSize(payLoad);
-    foamVtkOutput::writeList(format, pts);
+    vtk::writeList(format, pts);
     format.flush();
 
     format
         .endDataArray()
-        .endTag(vtkFileTag::POINTS);
+        .endTag(vtk::fileTag::POINTS);
 }
 
 
 void Foam::fileFormats::VTPsurfaceFormatCore::writeFooter
 (
-    foamVtkOutput::formatter& format
+    vtk::formatter& format
 )
 {
     // Slight cheat. </Piece> too
-    format.endTag(Foam::vtkFileTag::PIECE);
+    format.endTag(Foam::vtk::fileTag::PIECE);
 
-    format.endTag(vtkFileTag::POLY_DATA)
+    format.endTag(vtk::fileTag::POLY_DATA)
         .endVTKFile();
 }
 
@@ -85,7 +85,7 @@ void Foam::fileFormats::VTPsurfaceFormatCore::writeFooter
 
 void Foam::fileFormats::VTPsurfaceFormatCore::writeCellData
 (
-    foamVtkOutput::formatter& format,
+    vtk::formatter& format,
     const UList<surfZone>& zones
 )
 {
@@ -98,7 +98,7 @@ void Foam::fileFormats::VTPsurfaceFormatCore::writeCellData
         payLoad += z.size();
     }
 
-    format.tag(vtkFileTag::CELL_DATA);
+    format.tag(vtk::fileTag::CELL_DATA);
     format.openDataArray<label>("region")
         .closeTag();
 
@@ -117,31 +117,31 @@ void Foam::fileFormats::VTPsurfaceFormatCore::writeCellData
     format.flush();
     format.endDataArray();
 
-    format.endTag(vtkFileTag::CELL_DATA);
+    format.endTag(vtk::fileTag::CELL_DATA);
 }
 
 
 void Foam::fileFormats::VTPsurfaceFormatCore::writeCellData
 (
-    foamVtkOutput::formatter& format,
+    vtk::formatter& format,
     const labelUList& zoneIds
 )
 {
     // Zone ids as CellData
 
-    format.tag(vtkFileTag::CELL_DATA);
+    format.tag(vtk::fileTag::CELL_DATA);
     format.openDataArray<label>("region")
         .closeTag();
 
     const uint64_t payLoad(zoneIds.size() * sizeof(label));
 
     format.writeSize(payLoad);
-    foamVtkOutput::writeList(format, zoneIds);
+    vtk::writeList(format, zoneIds);
 
     format.flush();
     format.endDataArray();
 
-    format.endTag(vtkFileTag::CELL_DATA);
+    format.endTag(vtk::fileTag::CELL_DATA);
 
 }
 
diff --git a/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormatCore.H b/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormatCore.H
index 32e03e2107..4b4a3ad85d 100644
--- a/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormatCore.H
+++ b/src/surfMesh/surfaceFormats/vtp/VTPsurfaceFormatCore.H
@@ -58,26 +58,26 @@ protected:
         //- Write file header information with points
         static void writeHeader
         (
-            foamVtkOutput::formatter& format,
+            vtk::formatter& format,
             const pointField& pts,
             const label nFaces
         );
 
         //- Write file footer
-        static void writeFooter(foamVtkOutput::formatter& format);
+        static void writeFooter(vtk::formatter& format);
 
 
         //- Write regions (zones) information as CellData
         static void writeCellData
         (
-            foamVtkOutput::formatter& format,
+            vtk::formatter& format,
             const UList<surfZone>& zones
         );
 
         //- Write regions (zones) information as CellData
         static void writeCellData
         (
-            foamVtkOutput::formatter& format,
+            vtk::formatter& format,
             const labelUList& zoneIds
         );
 };
diff --git a/src/surfMesh/triSurface/interfaces/VTK/writeVTK.C b/src/surfMesh/triSurface/interfaces/VTK/writeVTK.C
index a9207eb219..047a5c53a7 100644
--- a/src/surfMesh/triSurface/interfaces/VTK/writeVTK.C
+++ b/src/surfMesh/triSurface/interfaces/VTK/writeVTK.C
@@ -33,9 +33,9 @@ License
 // TODO: make this run-time selectable (ASCII | BINARY)
 // - Legacy mode only
 
-static const Foam::foamVtkOutput::formatType fmtType =
-    Foam::foamVtkOutput::formatType::LEGACY_ASCII;
-    // Foam::foamVtkOutput::formatType::LEGACY_BASE64;
+static const Foam::vtk::formatType fmtType =
+    Foam::vtk::formatType::LEGACY_ASCII;
+    // Foam::vtk::formatType::LEGACY_BINARY;
 
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
@@ -46,15 +46,15 @@ void Foam::triSurface::writeVTK
     std::ostream& os
 ) const
 {
-    autoPtr<foamVtkOutput::formatter> format =
-        foamVtkOutput::newFormatter(os, fmtType);
+    autoPtr<vtk::formatter> format =
+        vtk::newFormatter(os, fmtType);
 
     // Header
-    foamVtkOutput::legacy::fileHeader
+    vtk::legacy::fileHeader
     (
         format(),
         "triSurface",
-        vtkFileTag::POLY_DATA
+        vtk::fileTag::POLY_DATA
     );
 
     const pointField& pts = this->points();
@@ -63,15 +63,15 @@ void Foam::triSurface::writeVTK
     const label nFaces = faceLst.size();
 
     // Points
-    foamVtkOutput::legacy::beginPoints(os, pts.size());
+    vtk::legacy::beginPoints(os, pts.size());
 
-    foamVtkOutput::writeList(format(), pts);
+    vtk::writeList(format(), pts);
     format().flush();
 
     // connectivity count (without additional storage)
     // is simply 3 * nFaces
 
-    foamVtkOutput::legacy::beginPolys(os, nFaces, 3*nFaces);
+    vtk::legacy::beginPolys(os, nFaces, 3*nFaces);
 
     labelList faceMap;
     surfacePatchList patches(calcPatches(faceMap));
@@ -88,7 +88,7 @@ void Foam::triSurface::writeVTK
                 const Face& f = faceLst[faceMap[faceIndex++]];
 
                 format().write(3);  // The size prefix
-                foamVtkOutput::writeList(format(), f);
+                vtk::writeList(format(), f);
             }
         }
         format().flush();
@@ -97,15 +97,15 @@ void Foam::triSurface::writeVTK
         // Write regions (zones) as CellData
         if (patches.size() > 1)
         {
-            foamVtkOutput::legacy::dataHeader
+            vtk::legacy::dataHeader
             (
                 os,
-                vtkFileTag::CELL_DATA,
+                vtk::fileTag::CELL_DATA,
                 nFaces,
                 1  // Only one field
             );
 
-            foamVtkOutput::legacy::intField
+            vtk::legacy::intField
             (
                 os,
                 "region",
@@ -132,22 +132,22 @@ void Foam::triSurface::writeVTK
         for (const Face& f : faceLst)
         {
             format().write(3);  // The size prefix
-            foamVtkOutput::writeList(format(), f);
+            vtk::writeList(format(), f);
         }
         format().flush();
 
 
         // Write regions (zones) as CellData
 
-        foamVtkOutput::legacy::dataHeader
+        vtk::legacy::dataHeader
         (
             os,
-            vtkFileTag::CELL_DATA,
+            vtk::fileTag::CELL_DATA,
             faceLst.size(),
             1  // Only one field
         );
 
-        foamVtkOutput::legacy::intField
+        vtk::legacy::intField
         (
             os,
             "region",