6.3 Use of Meta-Classes

Objects of meta-classes other than standard-class may be made available to KnowledgeWorks by including the KnowledgeWorks mixin standard-kb-object . This requires

• The existence of a validate-superclass method allowing standard-kb-object (meta-class standard-class ) to be a superclass of the class being defined with a different meta-class
• That the meta-class in question does not implement any particularly strange behaviour on slot access, for example, if querying a slot value results in setting it.

6.3.0.4 Example