[NeXus-tech] Proposed NXpoise class

[yayahjb]

Dear Colleagues,

   At present, in the CIF-NeXus functional mapping, we are placing
all axes into pose:NXcollection groups.  As previously discussed,
I propose introducing a new poise/NXpoise base class for this
purpose.  I recognize that it is a non-trivial task to provide
attribute-based validation of axis fields, so I suggest that we
introduce NXpoise initially under than same non-validation approach
as NXcollection.  When attribute-based validation of axis fields
is working then we can apply it to the fields in NXpoise without
disturbing the non-validation of NXcollection.

The description would be:

extends NXobject

Use NXpoise to gather together fields defining axes relevant to the
enclosing group, where an axis is a field that has at least the attributes
vector and offset.

If this is acceptable, I will work with Tobias to provide an xml
description.

   Regards,
     Herbert