* Renato Golin <rengolin@stripped> [2007-04-19 22:19+0100]
> On 19/04/07, Eric Prud'hommeaux <eric@stripped> wrote:
> >I'm fuzzy on the criteria for a semantic database, but SPASQL is a
> >project aimed at providing RDF access to conventional relational data.
> >There's a project page [SP], a talk I gave at XTech [SX] and a cvs
> >repository [SC].
>
> Thanks, very enlighting pages!
>
> Also read some others after googling for sparql & mysql. But I didn't
> noticed that sparql wouldn't allow us to query on a semantic data
> structure as well. Sesame (openrdf.org) uses on called SeRQL which is
> a bit different but not far from SQL as well.
If I recall, SeRQL has a few points of expressivity that don't exist
in SPARQL: existentials, set difference, transitive closures (and
builtin predicates to avoid transitive closures).
When you say "query on a semantic data structure", do you mean to
query the relational structure, much like "SHOW COLUMNS FROM"?
virtuoso may do that out of the box. You could add that to
SPASQL/MySQL. I'd look to d2rq for a good graph convention for
expressing structre schema
> >At some point, I'd like to add a triple store for stuff that doesn't
> >fit in the relational schema. This is prototyped in FeDeRate (Algae2
> >test case [TC]). Also want to port the query federation stuff to the
> >MySQL implementation (use case [FD]).
>
> I saw some perl modules on your page but didn't downloaded them, will
> take a closer look.
The perl stuff is a query re-writer, and probably not too interesting
to a MySQL hacker up to their elbows in C++. I'd be happy to happy to
geek about it, though.
>
> >Steve Harris, of garlik.com, has implemented a triple store, but not
> >within MySQL. He might be interested in this work.
>
> There is also Sesame but I didn't go that deep yet to study the tool.
> One colleague of mine said it is the standard today for storing RDFs
> but it won't have all the other "added benefits" MySQL have.
The standardisation work at W3C is focused around SPARQL.
http://www.w3.org/TR/rdf-sparql-query/
I don't know of any RDF query language standardization work in other
standards bodies. (It's such a beautiful irony that "standardisation"
can be spelled two ways?)
> Anyway, I'm still probing as I don't need it straight away but using
> MySQL will always be on top of my list, if available. Also, if there
> is a trend on that already I'd be very glad to be part of it.
>
> cheers,
> --renato
>
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