Rowlex: A property node cannot contain more than one entity description

Question

when using Rowlex OwlGrinder to generate an assembly from an OWL file the above error message is shown. The offending piece of OWL/XML is for example:

<DisjointClasses>
      <Class URI="&foaf;Document"/>
      <Class URI="&foaf;Organization"/>
</DisjointClasses>

but the same error message is also thrown in the case of multiple superclasses - e.g.:

<SubClassOf>
    <Class URI="&foaf;Image"/>
    <Class URI="&wordnet;Document"/>
</SubClassOf>

I am perfectly willing to accomodate my ontologies to a certain extend to be compatible with OwlGrinder, but the above code is happily processed by for example Protege so I assume it is valid OWL. Do you have a suggestion how to approach the - quite vital - information of disjoint-classes/multi-inheritance?

Thank you a lot, Hinnerk

Answer 1

Hmm - sorry for this. Looks like the problem actually was the file format of that Ontology being OWL/XML. When using RDF/XML things worked fine.