mak at aifb
May 26, 2008, 3:37 AM
Post #1 of 1
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Re: Wikitech-l Digest, Vol 57, Issue 25
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On Mittwoch, 16. April 2008, Aerik Sylvan wrote:
> S Page wrote:
> > Aerik Sylvan wrote:
> > > At the risk of asking a stupid question: what is the status of
> > > category intersections?
> >
> > At the risk of making a stupid answer: you could install the Semantic
> > MediaWiki extension and make queries like
> >
> > {{#ask:
> > [[Category:Actor]]
> > [[Category:Director]]
> > }}
> >
> > SMW will query for membership of subcategories (thus it'll match members
> > of Child actors) , to a configurable depth limit. The nifty thing is
> > you can
> > display other properties and categories of matching pages.
> >
> > See demo (temporarily) at,
> > http://www.semanticweb.org/wiki/Sandbox#Category_intersections
>
> That's cool... what's the backend for that? (I looked briefly at some docs
> at http://semantic-mediawiki.org/wiki/Semantic_MediaWiki but didn't quickly
> find any architecture stuff).
Better late than never: the intersections currently are computed with
straightforward SQL calls using joins. Before that, the query that a user
enters is parsed and pre-processed (e.g. to limit the complexity of the
query). It would be nice if we could have some faster backend for category
intersections, e.g. using column-based DBs or fast RDF-stores instead of
MySQL. Changing the storage backend in SMW can be done in a very modular
fashion, since all concrete methods for accessing SQL are in one file -- the
rest of the system uses interface methods instead of direct SQL calls.
Cheers
Markus
>
> Best Regards,
> Aerik
--
Markus Krötzsch
Institut AIFB, Universität Karlsruhe (TH), 76128 Karlsruhe
phone +49 (0)721 608 7362 fax +49 (0)721 608 5998
mak [at] aifb www http://korrekt.org
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