Regarding extensibility, I think we should take the advice of MarkusDemleitner regarding DataProduct, and have the values added as IVOA-controlled and registered enumerations. If possible, both a hierarchical and yuxtapositional notation (à la UCD) should be used. Regarding obs_title , I do not think we should rely on it for discovery. We should try to push for obs_creator_did , or at least for obs_publisher_did , as the ways for PIs to refer to VO datasets in their literature. Conversely, use of bib_reference should be allowed for discovery, and substituted by a VARCHAR(19) (length of a bibcode), or bigger if DOIs where to be allowed (something like VARCHAR(2048) should cover most ground for existing DOIs.
-- JuanDeDiosSantanderVela - 07 Mar 2011
As far as I understand obs_title is a free text description. Maybe usefull but the field name is confusing I think. Nothing to do with
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