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.