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Now, what, exactly, is a subject reifier? At the level of an international standard, we must explain things at a high level of abstraction, in implementation-neutral terms.
Abstractly speaking, then, a reifier is a set of property instances. Each property instance consists of a name and a value. The classes of which each of the properties are instances are defined by one or more Topic Map Application disclosures. Each Topic Map Application disclosure is, in fact, an ontology that meets the disclosure requirements for Topic Maps Applications. The values of the instances of each property class are constrained by the definitions of their classes.