The following issue has been SUBMITTED. ====================================================================== http://bugs.librdf.org/mantis/view.php?id=596 ====================================================================== Reported By: arto Assigned To: ====================================================================== Project: Raptor RDF Syntax Library Issue ID: 596 Category: api Reproducibility: always Severity: major Priority: normal Status: new Syntax Name: turtle ====================================================================== Date Submitted: 2015-03-16 13:13 Last Modified: 2015-03-16 13:13 ====================================================================== Summary: No serialized output for Turtle and abbreviated RDF/XML when data contains any blank-node cycles Description: When feeding the "turtle" or "rdfxml-abbrev" serializers some data that also happens to contain triples in the following pattern, no output whatsoever is produced:
_:g1 foaf:primaryTopic _:g2 . _:g2 foaf:isPrimaryTopicOf _:g1 . It is not just that the two triples in question are omitted, but indeed no output triples whatsoever are produced, only the base and prefix declarations (for Turtle) or the containing RDF/XML element (for abbreviated RDF/XML). This affects both use through the API as well as is reproducible using the `rapper` utility, as described below. Steps to Reproduce: $ cat circular.nt _:g1 <http://xmlns.com/foaf/0.1/primaryTopic> _:g2 . _:g2 <http://xmlns.com/foaf/0.1/isPrimaryTopicOf> _:g1 . $ rapper -q -i ntriples -o turtle circular.nt @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . $ rapper -q -i ntriples -o rdfxml-abbrev circular.nt <?xml version="1.0" encoding="utf-8"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"/> $ rapper -q -i ntriples -o rdfxml circular.nt <?xml version="1.0" encoding="utf-8"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";> <rdf:Description rdf:nodeID="g1"> <ns0:primaryTopic xmlns:ns0="http://xmlns.com/foaf/0.1/"; rdf:nodeID="g2"/> </rdf:Description> <rdf:Description rdf:nodeID="g2"> <ns0:isPrimaryTopicOf xmlns:ns0="http://xmlns.com/foaf/0.1/"; rdf:nodeID="g1"/> </rdf:Description> </rdf:RDF> $ rapper -q -i ntriples -o ntriples circular.nt _:g1 <http://xmlns.com/foaf/0.1/primaryTopic> _:g2 . _:g2 <http://xmlns.com/foaf/0.1/isPrimaryTopicOf> _:g1 . Additional Information: This would seem to be a regression, as I'm pretty sure this used to work once upon a time. Data files containing such cycles are not all that rare. ====================================================================== Issue History Date Modified Username Field Change ====================================================================== 2015-03-16 13:13 arto New Issue ====================================================================== _______________________________________________ redland-dev mailing list [email protected] http://lists.librdf.org/mailman/listinfo/redland-dev
