Hi,

I have realized that Xdmf does not have a concept of "extents", just
as vtkImageData does.
This is a problem for me, because I need to store separate VOI's that
make up one consistent canvas.
What's the best way to accomplish this with Xdmf? I am aware of the
HyperSlab concept, but the examples I saw so far were of the type:

<DataItem ItemType="HyperSlab"
  Dimensions="25 50 75 3"
  Type="HyperSlab">
  <DataItem
    Dimensions="3 4"
    Format="XML">
    0 0 0 0
    2 2 2 1
    25 50 75 3
    </DataItem>
    <DataItem
    Name="Points"
    Dimensions="100 200 300 3"
    Format="HDF">
    MyData.h5:/XYZ
  </DataItem>
</DataItem>

e.g. referencing subset of some full, but existing dataset. I do not
have this full dataset, I have multiple ones making up for one full.
How do others deal with this?

Best regards,
Dominik
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