Use Property Chains and Rolification Antoine Zimmermann’s answer is a very good start to this problem, and touches on the major point that you need to solve this sort of task: From x to each of x‘s brothers, there is a path of the form hasFather o hasFather-1. Now, that’s actually not true of just … Read more
ROWLEX is actually very cool (uses SemWeb internally). It is not just a browser app but rather an SDK written in C#. If you use ROWLEX, you do not directly interact with the tripples of RDF anymore (though you can), but gives an object oriented look&feel. There are two main usage scenarios: Business class first: … Read more
Section 3.2 of the paper that you linked to says: It is indeed possible to translate this rule into OWL 2—however this involves a transformation which we call rolification: The rolification of a concept A is a (new) role RA defined by the axiom A ≡ ∃RA.Self. Armed with rolification, we can now express rule … Read more
Don’t query RDF (or OWL) with XPath There’s already an accepted answer, but I wanted to elaborate on @Michael’s comment on the question. It’s a very bad idea to try to work with RDF as XML (and hence, the RDF serialization of an OWL ontology), and the reason for that is very simple: the same … Read more