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POOWL 2 reasoning with SWRL rules
 

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  1. POOWL 2 reasoning with SWRL rules
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    <p>I'm trying to use the <a href="http://www.hermit-reasoner.com/" rel="nofollow noreferrer">HermiT reasoner</a> to compute inferences for an ontology which contains a set of OWL axioms and a SWRL rule:</p> <pre><code>Ontology( ClassAssertion( :Student :Bob ) ClassAssertion( :Professor :DrBoffin ) ClassAssertion( :University :UF ) ObjectPropertyAssertion( :supervises :DrBoffin :Bob ) ObjectPropertyAssertion( :worksAt :DrBoffin :UF ) EquivalentClasses( :Student ObjectHasSelf( :r1 )) EquivalentClasses( ObjectHasSelf( :r2 ) ObjectSomeValuesFrom( :worksAt :University )) SubObjectPropertyOf( ObjectPropertyChain( :r2 :supervises :r1 ) :professorOf ) DLSafeRule(Body(ObjectPropertyAtom( :professorOf Variable( ?x ) Variable( ?y ))) Head(ObjectPropertyAtom( :instructorOf Variable( ?x ) Variable( ?y )))) ) </code></pre> <p>Basically, the OWL part is trying to express such a rule:</p> <pre><code>worksAt(x, y), University(y), supervises(x, z), Student(z) -&gt; professorOf(x, z) </code></pre> <p>using property chain and <a href="https://stackoverflow.com/questions/16989042/owl-2-rolification">rolification</a> techniques:</p> <p><img src="https://i.stack.imgur.com/Qljrk.png" alt="rule"></p> <p>The SWRL part is:</p> <pre><code>professorOf(x, y) -&gt; instructorOf(x, y) </code></pre> <p>The expected output should contain both <code>ObjectPropertyAssertion( :professorOf :DrBoffin :Bob )</code> and <code>ObjectPropertyAssertion( :instructorOf :DrBoffin :Bob )</code>. However, the actual output is (showing only object properties)</p> <pre><code>ObjectPropertyAssertion( :r1 :Bob :Bob ) ObjectPropertyAssertion( :professorOf :DrBoffin :Bob ) ObjectPropertyAssertion( :r2 :DrBoffin :DrBoffin ) ObjectPropertyAssertion( :supervises :DrBoffin :Bob ) ObjectPropertyAssertion( :worksAt :DrBoffin :UF) </code></pre> <p>Why isn't the expected SWRL result showing up? Any suggestions?</p>
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    1. USYang
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    1. COI don't know whether this is the problem or not, but the HermiT homepage (which you linked to) does say , “Note that reasoning with DL Safe rules is incomplete if the ontology contains property chains or transitivity axioms and complex properties are used in the rule bodies.” There are object property chains here, so that might lead to a problem.
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      1. USJoshua Taylor
    2. COIn your ontology, you have `SubObjectPropertyOf( ObjectPropertyChain( :r2 :supervises :r3 ) :professorOf )`. However, `:r3` does not appear to be used anywhere else. Is something missing?
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      1. USJoshua Taylor
    3. CO@JoshuaTaylor I'm sorry, it should be `:r1`. I've updated my post.
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