The third edition of the SemanticsCalls series of telecons took place Wed, 2021-03-10 at 16:00 UTC.


  • Steps towards a vocabulary of object types
  • Pre-RFC check of Vocabularies in the VO 2
  • AOB: new VEPs in the pipeline? Anything else?


Steps towards a vocabulary of object types

Use cases:

Prior Art:

The draft new hierarchy planned for Simbad is:

This doesn't contain the links to the corresponding UAT concepts yet; some things ("blue object") didn't have good matches.

Comparison of new object types in Simbad and UAT

How would using vocabularies this look like for the user in ADQL?

MD: see gavo_vocmatch UDF on; you would use obj_type='double-star' for an exact match, 1=gavo_vocmatch('otype', 'double-star', obj_type) to match the entire branch. But of course SIMBAD could use custom ways to make common use cases more straightforward.

Then there's candidate problem: The old hierarchy had some classes that said "we're not sure yet".

The current thinking is to have a Candidate-X for every X. MD suggests that perhaps a "we're not sure about the object type yet" flag in the table might work as well? SD considers if this could perhaps work like the membership likelihood for star clusters and the like?

Action: CDS->MD: prototype hierarchy+prototype mapping to UAT. MD then tries how far he gets with forming this into an IVOA vocabulary.

Pre-RFC check of Vocabularies in the VO 2


Request: If you know people in the TCG, remind them to review the document when RFC has started (which will happen soon).

AOB is still open; ML will voice her concerns on how this might overload #progenitor on-list.

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Topic revision: r2 - 2021-03-11 - MarkusDemleitner
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