[Paraview] Which xdmf reader?

[Carlson, Neil]

I'm using the pre-built 5.0.0 (64-bit Linux), and when I load
an XDMF file I'm presented with a choice of readers:
  Xdmf3 Reader
  Xdmf3 Reader (Top Level Partition)
  Xdmf Reader
What  is the difference between these?  I'm seeing different behaviour
from each on a silly toy grid consisting of a single quadrilateral element.

Thanks, Neil
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