regarding ALTTYPE [was RE: vo-dml in votable]
Laurent MICHEL
laurent.michel at astro.unistra.fr
Tue Mar 24 18:39:22 CET 2015
Hello everybody,
Reading the last threads I do not see any formal constraint on the
modeling space enclosed into the VO-DML serialization.
I may have missed something, but I'm understanding that VO-DML is not
only intended to carry the mapping of VO models in DAL responses but
that it should support any sort of DMs,
I think that clarifying this point could help contributors (myself at
least) to both figure out what are the stakes of this open though a
little bit obscure discussion about ALTTYPEs and to have an idea about
where to put the cursor between the completeness of the VODML
specification and a short term issue of a first recommendation usable by
both client and service implementers.
For instance, it is clear that considering models as abstract entities
which are not particularly related to some specific background will lead
us to tackle with all OO facets whereas limiting the scope of the
considered DMs to some composition or derivation of already defined VO
quantities could allow significant simplification in the serialization
process.
Joining the discussion very late and being not a guru, I hope not to be
too much naive =:)
Bye
Laurent
Le 16/03/2015 15:49, Mark Taylor a écrit :
> On Mon, 16 Mar 2015, gerard.lemson at gmail wrote:
>
>>> The important point is to keep the changes in VOTABLE as minimal and
>> rare
>>> as possible. I agree that the debate between "unique Types" / "multiple
>> Types" is
>>> still open and should be arbitrated by experience with VO-DML-aware
>> clients
>>> and prototypes.
>>> In these conditions and after considering all options I finally
>> follow Mark's
>>> proposal.
>>> This will allow some kind of experimental flexibility, freeze
>> VOTABLE changes
>>> rather soon and allow changes in VO-DML detailed syntax to be tuned in the
>>> coming monthes/years.
>> I am starting to come back a bit on what I thought Mark was proposing. I do
>> not know for sure whether we can guarantee that any proposed VOTable change
>> can be frozen until we have more progress on the mapping document itself. I
>> think I can guarantee that all annotation will be confined to VODML elements
>> on some VOTable types, but the precise details of this element may still
>> have to change a bit. In particular, simply setting maxOccurs=unbounded on
>> VODML/TYPE, though a useful step, may not be the end of the discussion.
>
> If that's the case, I'm not sure I'm so keen on my proposal either.
>
> --
> 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/
>
--
---- Laurent MICHEL Tel (33 0) 3 68 85 24 37
Observatoire de Strasbourg Fax (33 0) 3 68 85 24 32
11 Rue de l'Universite Mail laurent.michel at astro.unistra.fr
67000 Strasbourg (France) Web http://astro.u-strasbg.fr/~michel
---
More information about the dal
mailing list