Properties and Relations

Created on March 12, 2013, 12:54 a.m. by Hevok & updated by Hevok on May 2, 2013, 5:33 p.m.

The Web Ontology Language (OWL) offers the possibility to define disjunctive Properties which means two Properties, R and S are disjunctive

So they are either related by one of these Properties, e.g. via R or via S, i.e. one of them, but they are never be related with both Properties. Then these two Properties are defined as Disjoint Properties. If these Properties are disjoint one can define one Property for example as hasParent as an ObjectProperty and one states that on the same hand that this should be disjoint with the Property hasChild via the owl:propertyDisjointWith Property. Thus propertDisjoinWith defines two disjoint Properties.

There is a shortcut to make clear that several Properties are disjoint of each other. For example, one defines Set or a Collection of Properties and one states that all of these are disjoint. For this one defines a Class that is of type owl:DisjointProperties and the members of this are part of this Collection.

  :hasParent a owl:ObjectProperty ;
      owl:propertyDisjointWith :hasChild .
  • Shortcut for several disjunctive Properties
    [] rdf:type owl:AllDisoinProperties
       owl:members ( :hasParent :hasChild :hasGrantchild ) .

One can make a Property Hierarchy where one Property is at the top and another one at the bottom, which means that one has a top property of which all other Properties are Subproperties of but which is never a Subproperty of any other Property and one might have a Bottom Property which is always Subproperty of any other Property, but never any other Property is Subproperty of this Bottom Property. Therefore on can define Top Properties and Bottom Properties. Because of the distinction that one can has Object Properties and Datatype Properties, one has four different special Properties which are the topObjectProperty that related each potential Individuals and is SuperClass of all Object Properties and one has the owl:BottomObjectProperty which connects no Individuals at all, which is the Subclass of all Object Properties. For the Datatype Properties one has the owl:topDatatypeProperty which means relates all Individual with all possible typed Literals and which is Superclass to all Datatype Properties and one has on the bottom the owl:bttomDatatypeProperty which connects no Individual and no typed Literal and it is of course Subclass of all possible Datatype Properties.


Tags: relationships, ontology, property, identity
Categories: Concept
Parent: Properties

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