substance

Parent class and superclasses all the way to to 'Entity'

This is an ontological definition of the entity using the standard format of specifying the parent class followed by specification of characteristics that distinguish this class from others in that class

Some entities are created by combining other entities in logical relationships. This field provides the definition of an entity in those terms.

This indicates whether the entity has fuzzy boundaries e.g. adolescence. In that case users of the term must precisely specify the operationalisation of the class in each usage.