java - Traversing anonymous/blank nodes in Jena -


i using apache jena's api, graph contains anonymous/blank nodes well, due unionof , intersectionof. 1 of such example is:

<owl:class>    <owl:unionof rdf:parsetype="collection">         <rdf:description rdf:about="http://www.summyurl.com/something#entity1"/>         <rdf:description rdf:about="http://www.summyurl.com/something#entity2"/>    </owl:unionof> </owl:class>

which anonymous node/resource. when try uri, like:

"-50a5734d:15d839467d9:-1b8b"

i neither able sparql query using such uris (due exception on parsing such uris), nor able find appropriate jena method handle it.

i looking way explode such nodes , nested resources of it.

for example in below case, should return <http:/.../entity1>, <http:/.../entity2> , <http:/.../entity3>

<owl:class>    <owl:unionof rdf:parsetype="collection">         <rdf:description rdf:about="http://www.summyurl.com/something#entity1"/>         <owl:unionof rdf:parsetype="collection">             <rdf:description rdf:about="http://www.summyurl.com/something#entity2"/>             <rdf:description rdf:about="http://www.summyurl.com/something#entity3"/>         </owl:unionof>    </owl:unionof> </owl:class>

  1. is there inbuilt method of jena handle it?

  2. if not, how can efficiently?

using jena-model-api:

        string s = "<rdf:rdf\n" +             "    xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"\n" +             "    xmlns:dc=\"http://purl.org/dc/elements/1.1/\"\n" +             "    xmlns:owl=\"http://www.w3.org/2002/07/owl#\"\n" +             "    xmlns:rdfs=\"http://www.w3.org/2000/01/rdf-schema#\"\n" +             "    xmlns:xsd=\"http://www.w3.org/2001/xmlschema#\">\n" +             "  <owl:ontology/>\n" +             "  <owl:class>\n" +             "    <owl:unionof rdf:parsetype=\"collection\">\n" +             "      <owl:class rdf:about=\"http://www.summyurl.com/something#entity1\"/>\n" +             "      <owl:class>\n" +             "        <owl:unionof rdf:parsetype=\"collection\">\n" +             "          <owl:class rdf:about=\"http://www.summyurl.com/something#entity1\"/>\n" +             "          <owl:class rdf:about=\"http://www.summyurl.com/something#entity2\"/>\n" +             "        </owl:unionof>\n" +             "      </owl:class>\n" +             "    </owl:unionof>\n" +             "  </owl:class>\n" +             "</rdf:rdf>";     model m = modelfactory.createdefaultmodel();     try (inputstream in = new bytearrayinputstream(s.getbytes(standardcharsets.utf_8))) {         m.read(in, lang.rdfxml.getlabel());     }     //m.write(system.out, "ttl");     m.liststatements()             .mapwith(statement::getobject)             .filterkeep(rdfnode::isuriresource)             .mapwith(rdfnode::asresource)             .filterdrop(owl.class::equals)             .filterdrop(owl.ontology::equals)             .filterdrop(rdf.nil::equals)             .mapwith(resource::geturi)             .foreachremaining(system.out::println);

the output:

http://www.summyurl.com/something#entity1 http://www.summyurl.com/something#entity2 http://www.summyurl.com/something#entity1

this example. there lot of ways handle anything


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