- From: Dan Connolly <connolly@w3.org>
- Date: Fri, 11 Nov 2005 12:53:11 -0600
- To: Eric Prud'hommeaux <eric@w3.org>
- Cc: public-rdf-dawg@w3.org
Turns out I was answering the wrong question.
I thought the question was: give me a URI for the class of URIs.
Turns out the quesion is: help fill in the return type
column for DATATYPE() in the operator table.
http://www.w3.org/2001/sw/DataAccess/rq23/#FuncAndOp
What DATATYPE() is an rdfs:Datatype. So use that.
The examples (in 1.531 2005/11/11 18:40:59 ) show
WHERE { ?x foaf:name ?name ; eg:shoeSize ?size .
FILTER ( datatype(?size) = xsd:integer ) }
and it's true that
xsd:integer rdf:type xsd:Datatype
so that works out.
If you want the return type of DATATYPE() to be IRI
(or more standardly: xsd:anyURI), then that's a design
change. The example would have to be:
WHERE { ?x foaf:name ?name ; eg:shoeSize ?size .
FILTER ( datatype(?size) = "http://....#integer"^^xsd:anyURI ) }
which would work out, since
"http://....#integer"^^xsd:anyURI rdf:type xsd:anyURI.
i.e. that way, DATATYPE() returns the name/identifier of the
datatype, rather than the datatype itself.
--
Dan Connolly, W3C http://www.w3.org/People/Connolly/
D3C2 887B 0F92 6005 C541 0875 0F91 96DE 6E52 C29E
Received on Friday, 11 November 2005 18:53:17 UTC