VO-DML mapping RFC page

[Pierre Fernique]

Sorry, sent again for Apps and DAL members.
Pierre
---

Hi DMers,

I have a question concerning the VO-DML mapping RFC document recently 
published.  At the page 24, we read this constraint (in blue) :




May be I am wrong, but the obligation of removing DM elements of the 
MODEL header if there are no relevant data in the VOTable*will imply a 
very big constraint on the data provider, notably in the framework of 
TAP*. Concretely, it implies that the provider system should be able to 
associated to each column of its DB the relevant element of the DM or 
DMs associated to and possibly to manage the dependencies with other 
columns to know if the DM elements should or should not be inserted in 
the response (the list of resulting columns depends of the user query .
For instance, how Simbad database TAP system will be able to generate 
the appropriate MODEL elements for this kind of request "/SELECT s_ra 
from basic/").
If I am right, I am afraid that the MODEL mapping will be extremely 
difficult to implement in the framework of TAP.

Cheers
Pierre


Le 11/10/2017 à 09:30, Laurent Michel a écrit :
> Dear all,
>
> The RFC page for the VO-DML mapping is open now:
>
> http://wiki.ivoa.net/twiki/bin/view/IVOA/VODML-Mapping
>
> Please read, test and comment.
>
> Regards
> DM chair & vice-chair
>

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