virtuoso-opensource
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Virtuoso 7.1.0 does not return correct datatype for language-specified strings
Using http://affymetrix.bio2rdf.org/sparql
SELECT ?datatype
WHERE {
?s a http://bio2rdf.org/affymetrix_vocabulary:Probeset .
?s http://purl.org/dc/terms/title ?o .
FILTER isLiteral(?o)
BIND(DATATYPE(?o) AS ?datatype) .
}
limit 1
returns an empty value, but is expected to return rdf:langString
as per http://www.w3.org/TR/sparql11-query/#func-datatype
LANG(?o)
does return the language string.