resuming progress on TAP

[Guy Rixon]

On 10 Feb 2009, at 00:26, Patrick Dowler wrote:

> On Sunday 08 February 2009 19:27:19 Robert Hanisch wrote:
>> We can tweak the presentation, but it is essential, I think, to  
>> present
>> ADQL and PARAM together as alternative query languages, just as Pat  
>> has
>> very nicely described.  ADQL is required, PARAM is optional.  This  
>> was
>> agreed in Trieste.
>
> One way to approach this would be to follow the same strategy that  
> the VOQL
> group did when separating ADQL and TAP: we could specify the "DAL
> parameter-based query language" in a separate document that goes  
> through the
> standards process. It would be usable (referenced) by all DAL  
> services. The
> TAP spec would refer to the ADQL spec as a required language and  
> allow for
> use of other languages.
>
> Mechanically, the TAP service metadata would have to describe which  
> query
> languages and versions are supported, but we have to do that in any  
> case.

This was my motivation in putting the parametric query language into  
an annex in
the earlier drafts of TAP 0.31.
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