[ImageDM] new Provenance items - ObsData and others

[CresitelloDittmar, Mark]

All,

This is a discussion thread starter for a topic I put on the twiki a little
while ago.
There seems to be interest in discussing it.

The image model adds new elements under the Provenance umbrella (Bandpass,
DataSource<http://wiki.ivoa.net/twiki/bin/edit/IVOA/DataSource?topicparent=IVOA.ImageDM;nowysiwyg=0>,
ObsData<http://wiki.ivoa.net/twiki/bin/edit/IVOA/ObsData?topicparent=IVOA.ImageDM;nowysiwyg=0>).
There is question regarding where/how these should be included.

Mark.
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