An Property_space_as_property_definition is a Fusion that is between an Independent_property_definition and a Property_space and that indicates the Independent_property_definition is the whole membership of the Property_space viewed as a single item.
EXPRESS specification:
*) ENTITY Property_space_as_property_definition SUBTYPE OF (Fusion); class : Property_space; whole : Independent_property_definition; END_ENTITY; (*
Attribute definitions:
class : the Property_space that has a membership comprising the whole.
whole : the Independent_property_definition that can be decomposed into the members of the class.