New helper query interface method

[Guy Rixon]

If we have the query that just returns the list of identifiers, and we have
the query that returns the document for one identifier, then we wouldn't need
a paging arrangement; the client could do the paging by calling down the
documents one by one by identifier. This would be a lot simpler.

On Thu, 14 Apr 2005, Paul Harrison wrote:

> KevinBenson wrote:
> >>From what I could tell from Yuji e-mail the main thing is about not
> > returning so much data all at once to the client.  Somebody a long time ago
> > mentioned a resumptionToken or pagingID concept on the query/search.  I
> > think this is something that would be good and needed.  So you could page
> > through your query results.  That way you might not return thousands at a
> > time, but a certain amount and let the client page through all the results
> > with the registry web service.  A user may send a global query; not even
> > sure if we could handle returning 11,000 resources at once, so this is
> > something we should look into.  The idea would be is to return a pagingID
> > then a client who wants to see more would send it back again to the registry
> > web service to get the next set of Resources.
>
> This is a good idea that is worth considering..
> >
> > Cheers,
> > Kevin
> >
> > FYI, I will say Astrogrid does use a maxcount kind of property, so that is
> > the maximum number of resources that is returned from the registry.  But
> > having a paging system would be nicer in case a user wants to see more
> > results.
>
> A max return count that is set on the server is a bad idea - we have
> spend time tearing our hair out in the past wondering why a resource was
> not returned, when it had been cut off silently by such a mechanism..
>
> >
> > -----Original Message-----
> > From: owner-registry at eso.org [mailto:owner-registry at eso.org]On Behalf Of
> > Tony Linde
> > Sent: 14 April 2005 08:27
> > To: 'Registry List'
> > Subject: RE: New helper query interface method
> >
> >
> >
> >>I also think that Yuji Shirasaki's idea of having a search
> >>that returns a list of identifiers for a query is a
> >>potentially good one, and possibly even a function that
> >>returns the number of matches for a query.
> >>- This could of course be done with a single query interface
> >>function but with a slightly extended RQL
> >
> >
> > Perhaps a flag indicating whether to return 'documents', 'identifiers' or
> > 'count' on the query?
> >
> > T.
> >
> >
> >>-----Original Message-----
> >>From: owner-registry at eso.org [mailto:owner-registry at eso.org]
> >>On Behalf Of Paul Harrison
> >>Sent: 14 April 2005 08:15
> >>To: Ray Plante
> >>Cc: Registry List
> >>Subject: Re: New helper query interface method
> >>
> >>Ray Plante wrote:
> >>
> >>>Hi,
> >>>
> >>>
> >>>
> >>>>GetResource
> >>>
> >>>
> >>>I think it would be good to have an explicit identifier resolver
> >>>function, even though this is possible directly with the
> >>
> >>constraint-based search.
> >>
> >>>(In fact, we should define it as being equivalient to a search with
> >>>the constraint "identifier='{ivo-id}'".)  An immediate use for this
> >>>would be to check that an authority ID is not already registered;
> >>>however, I can imagine other applications using this.
> >>>
> >>>On Wed, 13 Apr 2005, Matthew J. Graham wrote:
> >>>
> >>>
> >>>>But this is exactly the same as the OAI GetRecord method?
> >>>
> >>>
> >>>The proposal is to make it specifically part of the Search
> >>
> >>interface
> >>
> >>>(which should be independent of the Harvesting interface).
> >>>
> >>>cheers,
> >>>Ray
> >>>
> >>
> >>It would please me! -the majority of the queries that I want
> >>to make are of this form, and it would save having to create
> >>adql for the purpose....
> >>
> >>I also think that Yuji Shirasaki's idea of having a search
> >>that returns a list of identifiers for a query is a
> >>potentially good one, and possibly even a function that
> >>returns the number of matches for a query.
> >>- This could of course be done with a single query interface
> >>function but with a slightly extended RQL
> >>
> >>Regards,
> >>	Paul.
> >>
> >>--
> >>Paul Harrison
> >>ESO Garching
> >>www.eso.org
> >>
> >
> >
> >
> >
>
>
> --
> Paul Harrison
> ESO Garching
> www.eso.org
>

Guy Rixon 				        gtr at ast.cam.ac.uk
Institute of Astronomy   	                Tel: +44-1223-337542
Madingley Road, Cambridge, UK, CB3 0HA		Fax: +44-1223-337523