Hi all, I found a bug in the JSON sparql serializer. When a query contains an OPTIONAL not matching all bindings in the result, the serializer adds an unnecessary "," to the end of the list of bound variables. The eval method in the javascript implementation of Opera had problems with this, firefox handled it somehow. Anyway, I think the test case explains it better (see attached file).
I'm also not sure if the selected variables are reported correctly. In the test case "x", "name" and "friend" are selected, but in the head only "x" and "name" are listed. If the optional wouldnt find any of the variables listed in the optional then this is correct, I think... but now when the "friend" variable is bound, should it also be listed in head? Cheers, Mikael
from rdflib import ConjunctiveGraph, plugin from rdflib.store import Store from StringIO import StringIO import unittest test_data = """ @prefix foaf: <http://xmlns.com/foaf/0.1/> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . <http://example.org/alice> foaf:name "Alice" . <http://example.org/alice> foaf:knows <http://example.org/bob> . <http://example.org/bob> foaf:name "Bob" . """ test_query = """ PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?name ?x ?friend WHERE { ?x foaf:name ?name . OPTIONAL { ?x foaf:knows ?friend . } } """ correct = """"name" : {"type": "literal", "xml:lang" : "None", "value" : "Bob"},\n "x" : {"type": "uri", "value" : "http://example.org/bob"}\n }""" class JSONTest(unittest.TestCase): def testOPTIONALSimple(self): graph = ConjunctiveGraph(plugin.get('IOMemory',Store)()) graph.parse(StringIO(test_data), format="n3") results = graph.query(test_query) result_json = results.serialize(format='json') self.failUnless(result_json.find(correct) > 0) if __name__ == "__main__": unittest.main()
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