SIAPv2 and datacubes

[Guy Rixon]

On 20 Mar 2009, at 11:17, Anita M. S. Richards wrote:

> This section describes the option of a 2-stage process to request and
> generate the data, but it was less clear to me that returning the data
> can also be 2-stage, i.e. the VO returns the metadata but the user
> decides when and how to get the actual data.

It is possible to have two accref-like columns in the table
returned by the initial search. One is as SIAP v1 and returns an image
synchronously. The other points to a UWS endpoint that makes the image  
on
demand. Any given service might provide either or both of these  
accrefs for
an image.

The alternative would be that the initial search is asynchronous, all  
the candidate
images are computed during the search and the accrefs are all  
synchronous. This
seems wildly too wasteful to me.

Note that UWS includes the provision for keeping the result - the  
image in this case -
on the server. VOSpace is not required.

Note further that an asynchronous accref is an application of UWS in  
its own right.
It is not CEA (a.k.a. UWS-PA), which is a separate, more-general, more  
complicated
application of UWS. What we need here can be quite light-weight.

Cheers,
Guy
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