Fwd: SODA gripes (1): The Big One

[François Bonnarel]

Dear Pat,
dear all,
On 15/01/2016 17:48, Patrick Dowler wrote:
>
> I would like to add (remind) that the evolution plan includes a 
> {metadata} capability that we nominally said would be part of SIA-2.1 
> but since it is another capability it could be defined there or in a 
> new spec or in another spec (eg SODA-1.1). The {metadata} capability 
> is intended to allow clients to get the necessary metadata for a 
> single dataset (ID=...) so they can figure out how to call the SODA 
> service and take advantage of all the features offered.
>
You make a very good point. {metadata} will provide everything we need 
for current and future  standard SODA functionalities.
> Now, that general usage pattern (make a remote call to get metadata) 
> is nice an clean but it isn't necessarily optimal if you want to 
> process many things the same way. I can understand Markus' idea to 
> define domain metadata inline in a SODA service descriptor but it 
> looks a lot like an optimisation to me. I' not saying it isn't 
> useful/necessary to optimise, but I do not think we should try to do 
> that without having tackled the general problem.
Ye, we are in an incremental process.
>
> This also makes me now think that {metadata} is much more closely 
> related to SODA than it is to SIA
I think you make here a very good point. SODA goal could be extended to 
access to data AND metadata for an indidual dataset.

By the way we could also imagine a "short" option of {metadata} based on 
obscore serialisation for the dataset and later a "full" version based 
on Cube and Dataset DM.

The "short" version could help SODA users not driven from a DAL 
discovery service (ObsTAP, SIAV2, SSA, etc...)

Cheers
François
> and it's a good thing we thought about detailed metadata but didn't do 
> anything in SIA-2.0 when we didn't need it. So it is good to advertise 
> intentions but not do anything concrete with them until we actually 
> need them :-)
>
>
>
> -- 
> Patrick Dowler
> Canadian Astronomy Data Centre
> Victoria, BC, Canada
>
>
>
> -- 
> Patrick Dowler
> Canadian Astronomy Data Centre
> Victoria, BC, Canada

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