Greetings!
I want to list all superclasses of a class using the
listSuperClasses()-Method of OntClass. For most classes that's not a
problem, but in some special cases I just receive a null as a
superclass. For example I've got this ontology:
...
<!-- [..]#Student -->
<Class rdf:about="[..]#Student">
<rdfs:subClassOf rdf:resource="[..]#Person"/>
<rdfs:subClassOf>
<Class>
<unionOf rdf:parseType="Collection">
<rdf:Description rdf:about="[..]#Man"/>
<rdf:Description rdf:about="[..]#Woman"/>
</unionOf>
</Class>
</rdfs:subClassOf>
</Class>
...
The [..] are just to shorten the ontology reference which is definitely
correct. The Person is recognized without any problem, but whenever the
ontology contains a "<rdfs:subClassOf> ... </rdfs:subClassOf>", it won't
find the superclass and returns null instead (ontClass.hasSuperClass()
returns true though). There are not only unions but also restrictions in
this form, that can't be found.
How can I correctly read these superclasses, whenever I receive a null?
Thanks in advance!
