RE: [Rdfapi-php-interest] Literal from a particular language in RDQL

[Seaborne, A. <and...@hp...>]

-------- Original Message --------
> From: Charles Nepote <>
> Date: 21 May 2005 01:00
>=20
> Hi,
>=20
> I am trying to query the label of a resource in a particular language.
>=20
> SELECT ?z WHERE (<http://example.org/ex#id>, rdfs:label, ?z@fr) USING
> rdfs FOR <http://www.w3.org/2000/01/rdf-schema#>=20
>=20
> --> error
>=20
>=20
> SELECT ?z WHERE (<http://example.org/ex#id>, rdfs:label, ?z) AND ?z =
=3D~
> "/@fr/"=20
> USING rdfs FOR <http://www.w3.org/2000/01/rdf-schema#>
>=20
> --> "no match"
>=20
> Any ideas ?
> See the discussion here :
> http://ilrt.org/discovery/chatlogs/swig/2005-05-20.html#T23-24-35
>=20
> ---
> Charles Nepote


It's "langeq" - it was added very late to RDQL and I don't know how
widely it is implemented.

AND ?z langeq "fr"

Which extracts the lang tag and does a language match:

AND  "foo"@en-gb langeq "en"=20

In SPARQL, it is approximately (the regex could be better):

FILTER regex(lang(?z), "^fr", "i")

And better still

FILTER ext:lang(?z, "fr") for a custom extension.

	Andy