[redland-dev] Does Rasqal support xsd:dataType?

[Seaborne, Andy]

-------- Original Message --------
> From: Christopher Schmidt <>
> Date: 24 April 2006 13:55
> 
> On Mon, Apr 24, 2006 at 05:14:55PM +0900, Hyunki Kim wrote:
> > Hi,
> > 
> > After inserting a RDF document to the mysql, I had a problem in
> > querying with the following SPARQL statement.
> 
> Use this instead:
> 
> 1. SPARQL Query
> prefix dc:         <http://purl.org/dc/elements/1.1/>
> PREFIX xsd:    <http://www.w3.org/2001/XMLSchema#>
> SELECT ?d
> WHERE { ?x  dc:date ?d^^<xsd:dateTime> . }#

The SPARQL idiom would be:

{ ?x  dc:date ?d . FILTER ( datatype(?d) = <xsd:dateTime> ) }

but note that the <> is an absolute URI, and not a qname related to the
XSD datatype dateTime.

The SPARQL grammar does not allow ?d^^<....>

In full:

prefix dc:         <http://purl.org/dc/elements/1.1/>
PREFIX xsd:    <http://www.w3.org/2001/XMLSchema#>
SELECT ?d
WHERE { 
    ?x  dc:date ?d . 
    FILTER ( datatype(?d) = xsd:dateTime )
}

removing the <> on the prefixed name to get
http://www.w3.org/2001/XMLSchema#dateTime

	Andy

> 
> 
> or similar ... I'm not actually sure what the format for rdf datatypes
> is with NS prefixes: you can definitely use:
> 
> WHERE { ?x  dc:date ?d^^<http://www.w3.org/2001/XMLSchema#dateTime> .
}
> 
> If the above doesn't work.
> 
> --
> Christopher Schmidt
> Web Developer