- From: imikhailov <imikhailov@openlinksw.com>
- Date: Sun, 15 Apr 2007 22:59:51 +0700
- To: <public-rdf-dawg@w3.org>
Hello,
I've tried data-r2 with my SPARQL-to-SQL front-end translator and I see an
issue with datatype(). Did I miss anything?
Query data-r2/expr-builtin/q-datatype-2.rq
PREFIX : <http://example/>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
SELECT ?x
{ ?x :p ?v .
FILTER( datatype(?v) != <http://example/NotADataTypeIRI> )
}
Source data data-r2/expr-builtin/data-builtin-2.ttl
@prefix : <http://example/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
:x1 :p "string" .
:x2 :p "string"^^xsd:string .
:x3 :p "string"@en .
:x4 :p "lex"^^:unknownType .
:x5 :p 1234 .
:x6 :p <http://example/iri> .
:x7 :p _:bNode .
The expected result set does not contain binding for :x3 :p "string"@en .
http://www.w3.org/TR/rdf-concepts/ says that "A plain literal is a string
combined with an optional language tag."
http://www.w3.org/TR/rdf-sparql-query/ , 11.4.7, says that "datatype ...
returns the datatype IRI of typedLit; returns xsd:string if the the
parameter is a simple literal."
So I believe that "string"@en has datatype xsd:string that is not equal to
<http://example/NotADataTypeIRI> and it should be reflected in the resulting
data set.
Query data-r2/expr-builtin/q-datatype-3.rq demonstrates the issue similar to
the previous one.
Best Regards,
Ivan Mikhailov
OpenLink Software.
Received on Sunday, 15 April 2007 15:59:57 UTC