Data Property Axioms
Data properties link individuals to data values.
A set of instances connected to the property is called a property extension.
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SubDataPropertyOf axiom
This axiom says that a property 'p1' is a subproperty 'sp1' of another property 'p2'. It also means that the instances of the subproperty are subsets to the property extension of the second property.
Equivalent data properties axiom
Equivalent property axioms exist when two properties have the same property extension.
Disjoint data properties axiom
Two properties are disjoint when they don't have individuals in common.
Functional data property axiom
A functional property is a property which can only have one value.
For an individual 'x', there can be only one definite individual 'y' such that 'x' is connected by the data property expression 'DPE' to 'y'.
Example: FunctionalDataProperty( a:hasAge ) Each object can have at most one age. DataPropertyAssertion( a:hasAge a:John "21"^^xsd:integer ) John is twenty-one years old.
Data property domain axiom
The domain links a property to a class description.
There can be more than one domain for a property.
Data Property range axiom
The range links the property to either a class description or a data range.
There can be more than one range for a property.
