[pycsw-devel] CSW Distributed search question

[Jose Garcia]

Hi Tom

Thanks for quick response.

I'll discuss with our customer this solution and will provide feedback
about final implementation, but unless a better idea I think we'll manage
the same way as pyCSW.

Regards,
Jose García


On Thu, May 2, 2013 at 4:58 PM, Tom Kralidis <tomkralidis at hotmail.com>wrote:

> Hi Jose: comments interleaved:
>
> ________________________________
> > From: jose.garcia at geocat.net
> > Date: Thu, 2 May 2013 16:16:36 +0200
> > To: pycsw-devel at lists.osgeo.org
> > Subject: [pycsw-devel] CSW Distributed search question
> >
> > Hi all
> >
> > I'm checking to implement DistributedSearch for GeoNetwork and the OGC
> > specification seem not very complete related to how to return results.
> > I have check pyCSW as it's implementing it to see how has been managed
> > and seem like this:
> >
> > - Supposing local catalog and a federated one.
> >
> > - A GetRecords query is send with startRecord=0 and maxRecords=10:
> >
> >     - Local node matches 12 results, so should return the first 10.
> >     - The same request is send to the remote catalog, that matches 24
> > results, so returns recordsMatched=24, recordsReturned=10
> >
> >    - Local node aggregates results and returns: recordsMatched =36,
> > recordsReturned=10, nextRecord=11 and returns local and remote records
> > (20 in total)
> >
> > I understand why returned the total records (20), otherwise when
> > requested startRecord=11 and maxRecords=10, if only returned 10 in
> > first request, the other 10 will be not returned in any way.
> >
> > Did you find about this behaviour in some other spec document or you
> > just decided it was the way to go?
> >
>
> We just decided it was the way to go in the absence of clarity from the
> standard.  As well, our initial implementation of this did/does not want to
> go down the route of resolving relevance of records across nodes before
> returning to the client.
>
> Having said this, CSW 3.0 addresses this issue with returning GetRecords
> w/ DistributedSearch results grouped by federated catalogue so it will be
> easier to represent this when CSW 3.0 comes out.
>
> Let us know how GN proceeds with this, as suggestions would be valued.  It
> would be great to have this functionality consistent across CSW 2.0.2
> implementations.
>
>
>
> > Also not a big expert in python, so hope no misunderstood the the code
> > and also the problem described is clear.
> >
> > Thanks in advance and regards,
> > Jose García
>



-- 
*
GeoCat Bridge for ArcGIS allows instant publishing of data and metadata on
GeoServer and GeoNetwork. Visit http://geocat.net for details.
_________________________
Jose García
GeoCat bv
Veenderweg 13
6721 WD Bennekom
The Netherlands
http://GeoCat.net <http://geocat.net/>

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