Characterising URL columns

[François Bonnarel]

Dear Mark,


Le 01/02/2018 à 16:23, Mark Taylor a écrit :
> Francois,
>
> On Thu, 1 Feb 2018, François Bonnarel wrote:
>
>> I gave talks on this topic both in ShanhaI and Santiago meetings, following
>> the ASTERICS discussion.
>>
>>      See
>> http://wiki.ivoa.net/internal/IVOA/InterOpOct2017DAL/DataLinkSolution.pdf
> Thank you, that's an interesting discussion.  I obviously wasn't
> thinking hard enough about datalink in Santiago or Shanghai to take
> it in.
>
>>      We prefer either the LINK solution exposed in the talk or if there is
>> variation of the output the ObsCore-like solution with two Fields and utypes.
> The LINK solution however, if I understand correctly, is not
> standards-based.  It appears to rely on the LINK substitution syntax
> described in VOTable Appendix A.1, annotated:
>
>      "The definitions enclosed in this appendix are *not* part of
>       VOTable 1.1, but are considered as candidates for VOTable
>       improvements."
>
> I believe this non-standard syntax is understood by Aladin, but not by
> other VOTable clients.
Yes  you are right. We need small changes in VOTABLE anyway (also 
because content-type doesn't admot the datalink value at the moment).

The templating could be pushed to the normalized section if everybody agrees

Cheers
François
> Mark
>
> --
> Mark Taylor   Astronomical Programmer   Physics, Bristol University, UK
> m.b.taylor at bris.ac.uk +44-117-9288776  http://www.star.bris.ac.uk/~mbt/