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RE: Spatial datatypes and RDF/OWL

From: John Goodwin <John.Goodwin@ordnancesurvey.co.uk>
Date: Tue, 15 Apr 2008 11:26:05 +0100
Message-ID: <6A035FEF345E064E893D784097F8BC7F024A1795@OSMAIL.ordsvy.gov.uk>
To: "Michael Smith" <msmith@clarkparsia.com>
Cc: <semantic-web@w3.org>

> On Mon, 2008-04-14 at 11:12 +0100, John Goodwin wrote:
>
> > It would be nice to see spatial extension to triples stores (in an
> > analogous way to spatial extensions of relational databases) that
> > allow SPARQL queries of the form:
> 
> >             ?a hasGeometry ?g1 .
> >             ?b hasGeometry ?g2 .
> >             FILTER (touches(g1,g2))
> 
> I also find your use of FILTER operator for touches more attractive
than
> using it as a predicate in the graph pattern - it maintains the nice
> boundary between object data and spatial datatype data.
> 

Yes I agree - seems more elegant some how, and presumably an analogous
"built in" could be added to SWRL/DL Safe Rules so that I could say
something along the lines of 

hasGeom(a,g1) ^ hasGeom(b,g1) ^ swrlb:TOUCHES(g1,g2) -> adjacent(a,b)

so that people could use the predicate in the graph pattern should they
prefer. 


> DL reasoners, such as Pellet, offload datatype reasoning now, so you
> are, in one sense, *just* requesting some new datatypes and operators
be
> added and standardized for this context.  I think it is an engineering
> problem - and one for which solutions are likely to appear soon.
> 
Yes that's pretty much what I was asking for I guess. 

I look forward to see a solution to this engineering problem in OWLGRES
sometime soon ;)

Cheers

John

.


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Received on Tuesday, 15 April 2008 10:26:48 UTC

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