<div dir="ltr"><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">A more careful writing of the "this is the UCD" part could have said "this is the primary UCD" and implementers can add a modifier of they like... probably ObsCore is too rigidly specified.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Of course, with added flexibility it would mean clients and validators would have to be more careful as well.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">my 2c,<br clear="all"></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div>--<br></div><div>Patrick Dowler<br></div>Canadian Astronomy Data Centre<br></div>Victoria, BC, Canada<br></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr">On Mon, 19 Nov 2018 at 08:09, Markus Demleitner <<a href="mailto:msdemlei@ari.uni-heidelberg.de">msdemlei@ari.uni-heidelberg.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi DAL,<br>
<br>
On Fri, Nov 09, 2018 at 12:22:06PM -0800, Gregory Dubois-Felsmann wrote:<br>
> The ObsCore 1.1 standard, in Appendix C, Table 6, specifies the<br>
> UCDs to be associated with ObsCore columns. In particular, for<br>
> s_ra and s_dec, it suggests pos.eq.ra and pos.eq.dec. <br>
> <br>
> [...]<br>
> Was it considered, or would it be appropriate, for a service<br>
> returning an ObsCore-compliant table (e.g., an SIAv2 or ObsTAP<br>
> service) to be required (or strongly recommended) to include<br>
> “meta.main” in the UCDs for “s_ra” and “s_dec”?<br>
<br>
I'm not sure if it was considered, but it makes perfect sense to me.<br>
It would, at the very least, help clients that don't know obscore or<br>
don't now that a certain table is obscore make sense of the thing.<br>
<br>
The trouble is: how would we get there? Since validators check for<br>
the unmodified pos.eq.* UCDs, a service that adds a ;meta.main will<br>
become invalid. An erratum proposing the addition would hence be<br>
sort of hard to justify. For a similar reason I'm not sure even an<br>
Obscore 1.2 could introduce it -- although I doubt that at this point<br>
there's code out there that would break.<br>
<br>
So -- if someone finds a way to transition into having *;meta.main in<br>
obscore, you'd have my support. But I'm afraid I lack the<br>
creativity...<br>
<br>
-- Markus<br>
<br>
<br>
<br>
</blockquote></div>