Is abstract

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

Field on: Topic type
Has roles: Topic type

Unary association used to mark topic types as abstract. That is, a topic type which has an association of this type is not meant to have direct instances, and Ontopoly will not allow instances of it to be made.

Usage:

on:is-abstract(legal-entity : on:topic-type)