I'm working with input models like this one:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
xmlns="http://www.test.org/";>
<rdf:Description rdf:about="http://www.test.org/test";>
<sometext xml:lang="en" rdf:parseType="Literal">some
text</sometext>
<sometext xml:lang="fr" rdf:parseType="Literal">texte</sometext>
</rdf:Description>
</rdf:RDF>
I'm trying to load the text for a given language, using some SPARQL like
this:
SELECT ?sometext
WHERE {
?x <http://www.test.org/sometext>?sometext .
FILTER (LANG(?sometext) = 'en')
}
As you can see bellow, I'm having trouble to filter the result according
to the language (en):
$ sparql --data=data.rdf.xml --query=test.rq
------------
| sometext |
============
------------
If I comment out the filtering as
# FILTER (LANG(?sometext) = 'en')
the result is as bellow:
------------------------------------------------------------------------
| sometext |
========================================================================
| "texte"^^<http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral>|
| "some text"^^<http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral>|
------------------------------------------------------------------------
If I remove all the rdf:parseType="Literal" attributes from the model,
using the initial query, result is:
------------------
| sometext |
==================
| "some text"@en |
------------------
So, it seems that the xml:lang attribute applies to the sometext element
itself, but _not_ to the enclosed literal denoted by
rdf:parseType="Literal".
I'm quite sure it's not a bug within the Jena framework, but rather a
consequence from my ignorance: how should i write the SPARQL query to
filter the results according to the value of the xml:lang attribute,
provided I have to accommodate with the input model ?
Thanks for any advice or interesting pointer.
Regards.
