In this paper we present an approach for representing temporally changing information in OWL. This approach is based on a reification strategy founded on results from the philosophical discipline of Formal Ontology. These results grant ontological meaning to the reified individuals (intrinsic and relational properties) and provide an ontological semantics to the resulting specification. We also propose here some methodological guidelines for guiding the use of the proposed framework in supporting modeling decisions in OWL. By using the proposed framework, one can represent domain information regarding sources of temporal change such as the distinction between necessary versus contingent properties, or mutable versus immutable ones. Finally, we compare the proposed approach with another commonly used strategy for circumventing OWLs limitation wrt temporally changing information.