UPDM Artifact: An EnterprisePhase can be sub-divided into structural and temporal parts. TemporalPart describes the EnterprisePhase elements that have a time based nature.
MODAF/NAF: Asserts that one EnterprisePhase is a temporal part of another.
Info
This means that both EnterprisePhases have the same spatial extent, i.e., this is only a temporal structure (MODAF::EnterpriseTemporalPart).