Timesys note review

[François Bonnarel]

Hi Mark,


Le 06/12/2018 à 10:50, Mark Taylor a écrit :
> On Thu, 6 Dec 2018, François Bonnarel wrote:
>
>> The main issue there is not (to my eyes) that ref can come in several contexts
>> but that there is one single ref allowed on each element, which is coming from
>> xml itself and not from VOTable properly.
> No, it is a VOTable constraint.  VOTable could have been written so
> that you could make multiple references from a single element,
> e.g. by giving the ref attribute the type xs:IDREFS rather than
> xs:IDREF.
Thank you. I didn't know that, and forgot about xs:IDREFS
> But it's not.  In principle it would be possible to
> change that without invalidating any existing VOTable instances,
> since anything which fits IDREF also fits IDREFS.  But I'm not
> proposing that we do that.
Can you say why ? It looks like  that could avoid using too much GROUPs 
in some cases. But maybe there are other drawbacks I don't see.

Cheers
François


>
> --
> 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/