在Java中查找OWL类

Question

I'm starting to learn about OWL in Java, I've read some tuts including OWL API, Apache Jena, and Protege. I want to get the class in owl, but in OWL API it returns the inputted IRI.

Here's the process: Let's take it that I'm looking for word 'beauty', which is individual of 'Inspector', and 'Inspector' is subclass of 'Guardian'. Currently in my program the output is the IRI of beauty itself. I wanted to get the Inspector IRI and Guardian IRI.

Any help/guide will be appreciated, thanks :)

Answer 1

If you have an OWLIndividual , then you should be able to call getTypes to get a set of the types that it has, one of which would be the class that you're describing. (Note that the default toString method some of the OWL API classes might show the IRI of the thing, so simply printing an individual or class might look the same as printing its IRI as a string.) getTypes returns a set of OWLClassExpressions , and once you've got one of those, you could use asOWLClass to get the corresponding class, and then use getSuperClasses to walk up your class hierarchy. Note that, as Ignazio pointed out in the comments , you should only call asOWLClass if the class expression is not anonymous. To get a list of superclasses that is guaranteed to be complete, you'll also need to use reasoner that is complete with respect to OWL, which the reasoner built in with OWL API is not.