Hi ! It seems that there is a bug with the rdflib 2.4.0 sparql query, here an code example inspired from http://www.w3.org/TR/rdf-sparql-query/#func-bound :
from rdflib import Literal, ConjunctiveGraph, Namespace, BNode, URIRef DC = Namespace(u"http://purl.org/dc/elements/1.1/";) FOAF = Namespace(u"http://xmlns.com/foaf/0.1/";) graph = ConjunctiveGraph() s = BNode() graph.add((s, FOAF['givenName'], Literal('Alice'))) b = BNode() graph.add((b, FOAF['givenName'], Literal('Bob'))) graph.add((b, DC['date'], Literal("2005-04-04T04:04:04Z"))) print graph.query("""PREFIX foaf: <http://xmlns.com/foaf/0.1/> PREFIX dc: <http://purl.org/dc/elements/1.1/> PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> SELECT ?name WHERE { ?x foaf:givenName ?name . OPTIONAL { ?x dc:date ?date } . FILTER ( bound(?date) ) }""").serialize('python') I think the expected result is [Literal('Bob')], but the result I have is []. Thanks for your really great job, -- Romain Chantereau <[EMAIL PROTECTED]> _______________________________________________ Dev mailing list Dev@rdflib.net http://rdflib.net/mailman/listinfo/dev
