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

[Richard C. <ri...@cy...>]

Hi,

Am 23.05.2005 um 09:21 schrieb Seaborne, Andy:
>> From: Charles Nepote <>
>> I am trying to query the label of a resource in a particular =20
>> language.
>>
>> SELECT ?z WHERE (<http://example.org/ex#id>, rdfs:label, ?z@fr) USING
>> rdfs FOR <http://www.w3.org/2000/01/rdf-schema#>
>> --> error
>>
>> SELECT ?z WHERE (<http://example.org/ex#id>, rdfs:label, ?z) AND ?=20
>> z =3D~
>> "/@fr/"
>> USING rdfs FOR <http://www.w3.org/2000/01/rdf-schema#>
>> --> "no match"
>>
>> Any ideas ?
>> See the discussion here :
>> http://ilrt.org/discovery/chatlogs/swig/2005-05-20.html#T23-24-35
>>
>> ---
>> 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"

I guess RAP doesn't support langeq.

This is the Jena implementation of langeq:

http://cvs.sourceforge.net/viewcvs.py/jena/jena2/src/com/hp/hpl/jena/=20
rdql/parser/Q_StringLangEqual.java?rev=3DHEAD&view=3Dauto

The rawEval function is the interesting part.

> In SPARQL, it is approximately (the regex could be better):
>
> FILTER regex(lang(?z), "^fr", "i")

With subtag match:

FILTER REGEX(LANG(?label), '^fr(-|$)', 'i')

See also:
http://dowhatimean.net/2005/05/the-semantic-web-and-languages-that-=20
are-not-english

Richard



> And better still
>
> FILTER ext:lang(?z, "fr") for a custom extension.
>
>     Andy
>
>
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