- From: Eric Prud'hommeaux <eric@w3.org>
- Date: Mon, 12 Dec 2005 11:15:35 -0500
- To: Bjoern Hoehrmann <derhoermi@gmx.net>
- Cc: public-rdf-dawg-comments@w3.org
- Message-ID: <20051212161535.GO17752@w3.org>
On Tue, Nov 22, 2005 at 04:19:20PM +0100, Bjoern Hoehrmann wrote: > > * Eric Prud'hommeaux wrote: > >however, consistency is always nice. I'll propose > >"In SPARQL, a language-range of "*" matches any language-tag string > >and matches """ (maybe "the empty string"?) > >to the DAWG. > > I think I'm happy either way, the current behavior makes some sense if > you care about only those things that have language information (though > language tags like "und" might complicate that) while the above would > make sense if you don't care about the language at all but hardcode the > langmatches() for simplicity (say, the query is composed through a UI > where some 'any language' select box entry translates to '*'). It would > be good to give an example for both use cases in the document. Good advice: added example to editor's draft: [[ @prefix dc: <http://purl.org/dc/elements/1.1/> . _:a dc:title "That Seventies Show"@en . _:a dc:title "Cette Série des Années Soixante-dix"@fr . _:a dc:title "Cette Série des Années Septante"@fr-BE . _:b dc:title "Il Buono, il Bruto, il Cattivo" . This query uses langMatches and lang (described in section 11.2.3.8) to find the French titles for the show known in English as "That Seventies Show": PREFIX dc: <http://purl.org/dc/elements/1.1/> SELECT ?title WHERE { ?x dc:title "That Seventies Show"@en ; dc:title ?title . FILTER langMatches( lang(?title), "FR" ) } Query result: title "Cette Série des Années Soixante-dix"@fr "Cette Série des Années Septante"@fr-BE The idiom langMatches( lang( ?v ), "*" ) will not match literals without a language tag as lang( ?v ) will return an empty string, so PREFIX dc: <http://purl.org/dc/elements/1.1/> SELECT ?title WHERE { ?x dc:title ?title . FILTER langMatches( lang(?title), * ) } will report all of the titles with a language tag: title "That Seventies Show"@en "Cette Série des Années Soixante-dix"@fr "Cette Série des Années Septante"@fr-BE ]] [CLOSED] ? -- -Eric office: +81.466.49.1170 W3C, Keio Research Institute at SFC, Shonan Fujisawa Campus, Keio University, 5322 Endo, Fujisawa, Kanagawa 252-8520 JAPAN +1.617.258.5741 NE43-344, MIT, Cambridge, MA 02144 USA cell: +81.90.6533.3882 (eric@w3.org) Feel free to forward this message to any list for any purpose other than email address distribution.
Received on Monday, 12 December 2005 16:15:51 UTC