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Posted to dev@jena.apache.org by "Andy Seaborne (JIRA)" <ji...@apache.org> on 2019/05/10 09:04:00 UTC
[jira] [Commented] (JENA-1710) Wrong turtle serialization of
RDFList with itself inside
[ https://issues.apache.org/jira/browse/JENA-1710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16837058#comment-16837058 ]
Andy Seaborne commented on JENA-1710:
-------------------------------------
[~szz] - thanks for the report and test case.
The indirect cycle is confusing the pretty printer. Directly including a list in itself is handled but the indirect, through owl:unionOf isn't handled. Because that is potentially an arbitrary chain of properties, it is difficult to see an immediate fix.
Using {{RDFData.write}} and formats {{RDFFormat.TURTLE_BLOCKS}} or {{RDFFormat.TURTLE_FLAT}} work - they don't do any list formatting.
The other workaround, especially for OWL class definitions, is "don't do that!".
> Wrong turtle serialization of RDFList with itself inside
> --------------------------------------------------------
>
> Key: JENA-1710
> URL: https://issues.apache.org/jira/browse/JENA-1710
> Project: Apache Jena
> Issue Type: Bug
> Components: Base, Jena, RIOT
> Affects Versions: Jena 3.9.0, Jena 3.10.0, Jena 3.11.0
> Environment: jena-arq-3.11.0, java8
> Reporter: ssz
> Priority: Minor
>
> Testcase:
> {quote}Model m = ModelFactory.createDefaultModel();
> Resource b0 = m.createResource();
> Resource b1 = m.createResource();
> {color:#808080}// add 4 statements:{color}
> b0.addProperty(OWL.{color:#660e7a}unionOf{color}, b1).addProperty(RDF.{color:#660e7a}type{color}, OWL.{color:#660e7a}Class{color});
> b1.addProperty(RDF.{color:#660e7a}first{color}, b0).addProperty(RDF.{color:#660e7a}rest{color}, RDF.{color:#660e7a}nil{color});
> m.write(System.{color:#660e7a}out{color}, {color:#008000}"ttl"{color});
> m.write(System.{color:#660e7a}out{color}, {color:#008000}"nt"{color});
> {quote}
> Output:
> {quote}_:b0 <[http://www.w3.org/1999/02/22-rdf-syntax-ns#first]>
> _:b1 ;
> <[http://www.w3.org/1999/02/22-rdf-syntax-ns#rest]>
> () .
> _:B40396d1bX2D68d6X2D40b4X2DbbcdX2Dbe185973bfc1 <[http://www.w3.org/1999/02/22-rdf-syntax-ns#rest]> <[http://www.w3.org/1999/02/22-rdf-syntax-ns#nil]> .
> _:B40396d1bX2D68d6X2D40b4X2DbbcdX2Dbe185973bfc1 <[http://www.w3.org/1999/02/22-rdf-syntax-ns#first]> _:B4da6d814X2Ddb64X2D4ff1X2Da5d4X2D4f71d5718fd9 .
> _:B4da6d814X2Ddb64X2D4ff1X2Da5d4X2D4f71d5718fd9 <[http://www.w3.org/1999/02/22-rdf-syntax-ns#type]> <[http://www.w3.org/2002/07/owl#Class]> .
> _:B4da6d814X2Ddb64X2D4ff1X2Da5d4X2D4f71d5718fd9 <[http://www.w3.org/2002/07/owl#unionOf]> _:B40396d1bX2D68d6X2D40b4X2DbbcdX2Dbe185973bfc1 .
> {quote}
>
> So in turtle there are only 2 triples, while expected 4.
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