I'm building my ontology using Protege tool and I've defined my classes and individuals. Now, I want to add relationship between classes. However, I've read that:
object property define relations between instances, but in OWL we can use restriction to define relations between classes
Can you help with some example to understand that?
My issue: I have class1
and class2
for which I need to build an "opposite Of" relation between those classes. Can you help?
Here are some steps you can follow:
(1) Create the classes Class1
and Class2
.
<owl:Class rdf:about="http://henrietteharmse.com/tutorial/DomainRangeExample#Class1"/>
<owl:Class rdf:about="http://henrietteharmse.com/tutorial/DomainRangeExample#Class2"/>
(2) Define an object property, say, related
with domain Class1
and range Class2
:
<owl:ObjectProperty rdf:about="http://henrietteharmse.com/tutorial/DomainRangeExample#related">
<rdfs:domain rdf:resource="http://henrietteharmse.com/tutorial/DomainRangeExample#Class1"/>
<rdfs:range rdf:resource="http://henrietteharmse.com/tutorial/DomainRangeExample#Class2"/>
</owl:ObjectProperty>
Explanation This states that if individual a
is related to individual b
via the object property related
then a
will be assumed to be of type Class1
and b
will be assumed to be of type Class2
.
(3) Define another object property, say inverseRelated
, that is the inverse of related
:
<owl:ObjectProperty rdf:about="http://henrietteharmse.com/tutorial/DomainRangeExample#inverseRelated">
<owl:inverseOf rdf:resource="http://henrietteharmse.com/tutorial/DomainRangeExample#related"/>
</owl:ObjectProperty>
Explanation This states that if individual a
is related to individual b
via the object property inverseRelated
then a
will be assumed to be of type Class2
and b
will be assumed to be of type Class1
.
(4) Define 2 individuals, say individual1
and individual2
with individual1
to individual2
via the inverseRelated
object property:
<owl:NamedIndividual rdf:about="http://henrietteharmse.com/tutorial/DomainRangeExample#individual1">
<DomainRangeExample:inverseRelated rdf:resource="http://henrietteharmse.com/tutorial/DomainRangeExample#individual2"/>
</owl:NamedIndividual>
<owl:NamedIndividual rdf:about="http://henrietteharmse.com/tutorial/DomainRangeExample#individual2"/>
(5) If you now run a reasoner over your ontology (ie in Protege), you will see that individual1
is inferred to be of type Class2
and individual2
is of type Class1
.
Consider classes A and B (I'm using turtle syntax)
:A rdf:type owl:Class .
:B rdf:type owl:Class .
You can define A and B to be disjoint (a relationship between classes), meaning that if an element is one of them it cannot be in another.
:A owl:disjointWith :B .
If you query for example:
not B
You obtain class A . It also works for individuals.
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