DAML+OIL for Application Developers - slide "DAML+OIL Properties"

DAML+OIL defines 2 subclasses of rdf:Property
- daml:DatatypeProperty
  - essentially a subclass of rdfs:Literal, restricting the lexical representation of the value to an XML Schema Datatype
- daml:ObjectProperty
  - used to refer to another instance using rdf:resource
daml:DatatypeProperty and daml:ObjectProperty are disjoint
- if we need to use a property as both an ObjectProperty and a DatatypeProperty, we need to define it as rdf:Property

alternative examples:


<daml:DatatypeProperty rdf:ID="author">
  <rdfs:range rdf:resource="&xsd;string"/>
</daml:DatatypeProperty>
<daml:ObjectProperty rdf:ID="author"/>
<rdf:Property rdf:ID="author">
  <rdfs:comment>could refer to either a string name or an instance</rdfs:comment>
</rdf:Property>