XDMF3 RectilinearGrid with HyperSlabbed coordinate arrays are not working.

Files like this:

  <Topology Type="2DRectMesh" NumberOfElements="5 5"/>

  <Geometry Type="VXVY">

    <DataItem ItemType="HyperSlab" Dimensions="5" Type="HyperSlab" ><DataItem Dimensions="3 2" NumberType="Int" Format="XML">0 0 1 1 1 5</DataItem>

      <DataItem Format="HDF" Dimensions="4 5" Name="x" NumberType="Float" Precision="8">

        test.hdf5:/Locations/x</DataItem>

      </DataItem>

    <DataItem ItemType="HyperSlab" Dimensions="5" Type="HyperSlab" ><DataItem Dimensions="3 2" NumberType="Int" Format="XML">0 0 1 1 1 5</DataItem>

      <DataItem Format="HDF" Dimensions="4 5" Name="y" NumberType="Float" Precision="8">

        test.hdf5:/Locations/y</DataItem>

      </DataItem>

  </Geometry>

  </Grid>

Are were found to work in Xdmf2, but not in Xdmf3 such that the X and Y coordinate arrays are nonsensical when read. It should work in either generation of the reader.