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Re: named graphs

From: Chris Bizer <chris@bizer.de>
Date: Fri, 30 Apr 2004 13:43:06 +0200
Message-ID: <005d01c42ea8$4e006a50$0f8d2da0@wrz03295>
To: "Phil Dawes" <pdawes@users.sf.net>, <www-rdf-interest@w3.org>

Hi Phil,

>
> I'm getting to the point where I need to start including provenance
> information in response to queries. I was wondering where the whole
> standardisation process is wrt named graphs.
>
> - Does the trix proposal represent current thinking in this field?
>

The current status quo of the trix work is described in
http://lists.w3.org/Archives/Public/www-archive/2004Apr/att-0081/PID-FAFPGYHS-1081860211.pdf

Beside of TriX, there is also a N3-like syntax for Named Graphs called TriG,
see:
http://www.wiwiss.fu-berlin.de/suhl/bizer/TriG/

>    - e.g. is the standardised model likely to be radically different
>    to its multiple closed-graphs approach?
>
> - Are there any triple stores that support the notion of named
> graphs internally? (i.e through the api)
>

There are no implementations yet, but it is planned to implement Named
Graphs as an extension to Jena 2 (Jeremy is to one to ask about details
here).

>
> - Has there been any work on query languages supporting querying
> across graphs?
>
> e.g.
> select ?foo, ?bah
> from <grapha>, <graphb>, <graphc>
> where (...)
>

There are two query languages for Named Graphs RDFQ and TriQL
http://www.wiwiss.fu-berlin.de/suhl/bizer/TriQL/  (Both not implemented yet)

I guess Jeremy, Pat and Patrick might also answer later ...

Chris

>
>
Received on Friday, 30 April 2004 07:38:59 GMT

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