VODataService 1.3 PR

[Markus Demleitner]

Dear Registry community,

A month ago I have uploaded a proposed recommendation for
VODataService 1.3 to the document repository:

https://ivoa.net/documents/VODataService/20260601/

In this new version 1.3, the most relevant news are:

* column statistics (with a goal to allow plausible guesses of
  distributions); sect. 3.5
* declaring which product types (e.g., time series vs. images) are in
  a resource; sect. 3.1.1
* declaring the source of the data (experiment vs. "theory"); also
  sect. 3.1.1.

We would like to start RFC within the next few weeks.  If you have
feedback to give on this until then (see also my Interop talk
<https://wiki.ivoa.net/internal/IVOA/InterOpJune2026Registry/vods13.pdf>
and the questions at the end), I'd be very grateful.  It's always
nice if documents can stay roughly constant during RFCs...

Thanks,

         Markus