[NeXus-committee] attribute 'ref' instead of 'value' in a few <dim> elements

[Joachim Wuttke]

Could somebody please enlighten me why in
   base_classes/NXdetector_group.nxdl.xml
   base_classes/NXmonitor.nxdl.xml
   base_classes/NXsensor.nxdl.xml
the element <dim> is used a few times with
attribute 'ref' instead of 'value'?

- Joachim

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