utype for STC region in SIAP query response

[Markus Demleitner]

Hi Thomas, hi List,

[utype for region withing SIAP]

On Mon, Aug 29, 2011 at 02:44:06PM +0200, Thomas Boch wrote:
> I wish this is something that could be standardized in a forecoming
> revision of the SIAP document, so that clients can easily find out
> which FIELD support the STC-S description.
Well, I'd say: the utype should reflect whatever place the region has 
within the the "Simple Image" data model.  Since there's no such
thing as far as I know, there should be no utype at all (though a UCD
might come in handy)..

However, we do have an STC data model, and there's a Note [1] on how
to embed the mapping of data in VOTables to it [disclaimer: mainly
written by yours truly].  So, what I'd suggest is to just use that.
If I may say so, it's much easier in implementation than one might
think, and it'll remain the way it is even if we decide to define a
Simple Image data model.

In the note, there's already an example for embedding a region.  I
think a future SIAP spec would profit from recommending a full STC
record, and I'll be happy to figure one out -- just not right now
since I'm on vacation.

Cheers,

      Markus

[1] http://www.ivoa.net/Documents/Notes/VOTableSTC/