如何使用OWLAPI获取概念的注释（类IRI的注释）？

Question

In the pato.owl ontology on the website http://www.obofoundry.org/ , some concepts has more than one Annotation. For example, concept PATO_0001051 has Label "acute angle to" and the definition: "An angle which is less than 90 degrees". How can I get through owlapi this Definition? Many thanks.

    <owl:Class rdf:about="http://purl.obolibrary.org/obo/PATO_0001051">
       <rdfs:label rdf:datatype="http://www.w3.org/2001/XMLSchema#string">acute angle to</rdfs:label>
       <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/PATO_0002326"/>
       <obo:IAO_0000115 rdf:datatype="http://www.w3.org/2001/XMLSchema#string">An angle which is less than 90 degrees.</obo:IAO_0000115>
       <oboInOwl:id rdf:datatype="http://www.w3.org/2001/XMLSchema#string">PATO:0001051</oboInOwl:id>
       <oboInOwl:hasOBONamespace rdf:datatype="http://www.w3.org/2001/XMLSchema#string">quality</oboInOwl:hasOBONamespace>
       <oboInOwl:inSubset rdf:resource="http://purl.obolibrary.org/obo/pato#relational_slim"/>
       <oboInOwl:inSubset rdf:resource="http://purl.obolibrary.org/obo/pato#value_slim"/>
   </owl:Class>

Answer 1

One way to approach this, is to find the class that you are looking for and then extract all the annotations that relate to that specific class. Remember that OWLAPI is quite well written and you can extract the string form of most of the IRIs. This is the way I have written it:

        for(OWLClass owl_class : localOntology.getClassesInSignature(true)){

        if(owl_class.getIRI().getFragment().equalsIgnoreCase("PATO_0001051"))
            for(OWLAnnotationAssertionAxiom annotations:owl_class.getAnnotationAssertionAxioms(localOntology))
                System.out.println(annotations.getProperty().getIRI().getFragment()+ " "+ annotations.getValue());
    }

The result looks like:

Answer 2

Dear Artemis and Ignazio, thank you very much for your answers. Here is the answer:

    for(OWLClass owl_class : localOntology.getClassesInSignature(true)){
         for(OWLAnnotationAssertionAxiom annotations:owl_class.getAnnotationAssertionAxioms(localOntology))
             if(annotations.getProperty().getIRI().getFragment()==null) {
                            System.out.println("definition: "+annotations.getValue());
                                                                        }
                                                         }