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SPARQL select optional with language

Asked 2011-10-29T06:08:11.597
21

I have some triples that look like this:

test:thing rdfs:label "Non-Language Label"
test:thing rdfs:label "English Label"@en
test:thing rdfs:label "French Label"@fr

I'd like to form a sparql query that gives me the "Non-Language Label" AND the "French Label", if any exists.

I tried this and it's not working:

PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
SELECT ?label ?preferredLabel
WHERE {
   test:thing rdfs:label ?label 
   OPTIONAL {
     test:thing rdfs:label ?preferredLabel . 
     FILTER (regex(str(?preferredLabel), '(^|\\\\W)fr', 'i'))
   }
}

Thanks in advance!

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PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
SELECT ?uri ?label ?preferredLabel
WHERE 
{
  {
   ?uri rdfs:label ?label . FILTER(LANG(?label) = "" && regex(str(?label), '(^|\\\\W)fr', 'i'))
  }
  UNION
  {
   ?uri rdfs:label ?preferredLabel . FILTER(LANG(?preferredLabel) = "fr" && regex(str(?preferredLabel), '(^|\\\\W)fr', 'i'))
  }
}
answered 2011-10-29T16:23:45.187

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