Cidoc-crm Version 4.2.4 - Reference Document / quote 18 of 18
Property quantifiers are ontological
We use the term property quantifiers for the declaration of the allowed number of instances of a certain property that an instance of its range or domain may have. These declarations are ontological, i.e. they refer to the nature of the real world described and not to our current knowledge. For example, each person has exactly one father, but collected knowledge may refer to none, one or many.