protege

I want to query all subclass of Nicotine (product). the result must be (Nasal form nicotine, Oropharyngeal from ni ..(4 items).. see in the picture) i try to query by rdfs:subClassOf+ and owl:equivalentClass+ but didn't work try from this example the code same here. PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> SELECT * WHERE { ?s owl:equivalentClass+ ?o . # and try ?s rdfs:subClassOf ?o filter(?s=<http://snomed.info/id/323283001>) } this image from protege Thank. The first query hard

I need to infer that one individual is the brother of other one if they have the same father. So, if I have this: Bart hasFather Homer. Lisa hasFather Homer. Because Bart and Lisa have the same father, I would like to infer: Lisa hasBrother Bart. Is there any method to do that using any property characteristics? Joshua Taylor 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,

I need to implement an OWL-ontology in Protégé, which contains a two classes: s1 and s2 , both are the instances of System class. These two classes are connected by the connection class s1_s2 , which contains property omega . This property has to take a value according to the following law: omega = 1 * s1.complete How can I implement it in Protégé, such way I could use it in SWRL-rule in the future? In general, you'd start by defining the classes and the properties that you need: At this point you could add some axioms that govern how the systems have to interact, how the properties work, etc.