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Concepts with Attribute Definitions

  • WSML allows two kinds of attribute definitions
    • Constraining definitions: An attribute definition of the form A ofType D, where A is an attribute identifier and D is a concept identifier, is a constraint on the values for attribute A; If the value for the attribute A is not known to be of type D, the constraint is violated and the attribute value is inconsistent with respect to the ontology
    • Inferring definitions: An attribute definition of the form A impliesType D, where A is an attribute identifier and D is a concept identifier, implies membership of the concept D for all values of the attribute A
  • Attributes which do not have a datatype range can be specified as being reflexive, transitive, symmetric, or being the inverse of another attribute 
  • WSML allows the specification of cardinality and range constraints (defined like integrity constraints in databases)

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