Topic type

Publisher:	Ontopia AS
PSI:	http://psi.ontopia.net/ontology/topic-type
Status:	Stable
PSI set:	Ontopoly meta-ontology
Type:	Topic type

Has fields: Field order; Forms hierarchy for; Has field; Has large instance set; Is abstract; Is hidden; Is read-only
Role in: Forms hierarchy for; Has cardinality; Has field; Has large instance set; Is abstract

Instances of this topic type are themselves topic types.

Some topic types can also be used as role types; if so, they are also instances of Role type, in addition to being instances of topic-type.

Also used as a role type in some association types.