- From: Patrick Stickler <patrick.stickler@nokia.com>
- Date: Mon, 3 May 2004 12:51:01 +0300
- To: "ext Chris Bizer" <chris@bizer.de>
- Cc: "Phil Dawes" <pdawes@users.sourceforge.net>, <www-rdf-interest@w3.org>
On Apr 30, 2004, at 14:43, ext Chris Bizer wrote: > > > 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). RDF Gateway by Intellidimension (http://www.intellidimension.com) has native support for "contexts" which could be easily used to implement named graphs (since a named graph is just as easily modeled as a context). The query language then provides native support for context-specific statements, as well as context-specific security/access control. > >> >> - Has there been any work on query languages supporting querying >> across graphs? >> >> e.g. >> select ?foo, ?bah >> from <grapha>, <graphb>, <graphc> >> where (...) >> Again, the query language provided with RDF Gateway provides for exactly this kind of multi-graph queries. What would be nice to see (and necessary in the long run IMO) would be a means to specify the target graphs by a sub-query. I.e. select ?foo, ?bah from ?graph where (?graph rdf:type my:TrustedGraph) and (...) etc. > > 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 ... RDFQ has been a useful "thought experiment" that I would like to have seen reach a higher stage of maturity in the implementation, but further development is at the moment, and probably for the summer, "on ice". Cheers, Patrick > > Chris > >> >> > > > -- Patrick Stickler Nokia, Finland patrick.stickler@nokia.com
Received on Monday, 3 May 2004 05:51:50 UTC