tdb will lose some information about prefix when load data from owl file,
the same owl file sample.owl, if I create OntModel from sample.owl directly , I
can get the prefix decleared in the owl file.
creating OntModel form owl file:
OntModelSpec s = new OntModelSpec( OntModelSpec.OWL_DL_MEM );
s.setDocumentManager( mgr );
OntModel model = ModelFactory.createOntologyModel(s);
InputStreamReader in;
try {
FileInputStream file = new FileInputStream(filePath);
in = new InputStreamReader(file, "UTF-8");
System.out.println("begin read");
model.read(in, null);
}
the part of OWL file:
<?xml version="1.0"?>
<!DOCTYPE rdf:RDF [
<!ENTITY foaf "http://xmlns.com/foaf/0.1/"; >
<!ENTITY owl "http://www.w3.org/2002/07/owl#"; >
<!ENTITY xsd "http://www.w3.org/2001/XMLSchema#"; >
<!ENTITY owlapi "http://www.semanticweb.org/owlapi#"; >
<!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#"; >
<!ENTITY contact "http://www.w3.org/2000/10/swap/pim/contact#"; >
<!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#"; >
<!ENTITY esesgrid "http://www.bjut.edu.cn/ontologies/2009/10/esesgrid.owl#";
>
<!ENTITY AccessControl
"http://www.bjut.edu.cn/ontologies/2009/12/AccessControl.owl#"; >
]>
<rdf:RDF xmlns="http://www.bjut.edu.cn/ontology/2011/10/esgrid.owl#";
xml:base="http://www.bjut.edu.cn/ontology/2011/10/esgrid.owl";
xmlns:contact="http://www.w3.org/2000/10/swap/pim/contact#";
xmlns:esesgrid="http://www.bjut.edu.cn/ontologies/2009/10/esesgrid.owl#";
xmlns:xsd="http://www.w3.org/2001/XMLSchema#";
xmlns:owlapi="http://www.semanticweb.org/owlapi#";
xmlns:AccessControl="http://www.bjut.edu.cn/ontologies/2009/12/AccessControl.owl#";
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#";
xmlns:foaf="http://xmlns.com/foaf/0.1/";
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
xmlns:owl="http://www.w3.org/2002/07/owl#";>
<owl:Ontology
rdf:about="http://www.bjut.edu.cn/ontology/2011/10/esgrid.owl"/>
but when I load the sample.owl into TDB, and create OntModel from TDB, some
prefixed will be lost, and only four prefixes can be get with
OntModel.getNsPrefixMapping().
Dataset ds = TDBFactory.createDataset(directory);
model = ds.getDefaultModel();
ontmodel = ModelFactory.createOntologyModel(
OntModelSpec.OWL_DL_MEM_TRANS_INF, model);
does tdb only support n-triple well, and the owl file be supported poor?
