Answer an iterator that ranges over the datatype property resources in this model, i.e. the resources with rdf:type DatatypeProperty
or equivalent. An datatype property is a property that is defined in the ontology language semantics as a one whose range comprises datatyped literals (rather than individuals).
Specifically, the resources in this iterator will those whose type corresponds to the value given in the ontology vocabulary associated with this model: see {@link Profile#DATATYPE_PROPERTY}.
@return An iterator over datatype property resources.
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