OWL Properties

• An OWL property connects two items.
• They are datatype properties (owl:DatatypeProperty) if they are relations between instances of classes and RDF literals and XML Schema datatypes.
• object properties (owl:ObjectProperty)if they are relations between instances of two classes.

<owl:ObjectProperty rdf:ID="hasParent">
  <rdfs:domain rdf:resource="#Animal"/>
  <rdfs:range rdf:resource="#Animal"/>
</owl:ObjectProperty>

• An Animal can have a parent which must be an Animal.

<owl:ObjectProperty rdf:ID="hasFather">
  <rdfs:subPropertyOf rdf:resource="#hasParent"/>
  <rdfs:range rdf:resource="#Male"/>  
</owl:ObjectProperty>

• hasFather is a property that is a kind of hasParent property, i.e., x's father is also x's parent.