This abstract element references a mode in order to indicate that the corresponding TimingConstraint is only valid when the specified mode is active.<br/><br/>Semantics:<br/>The TimingConstraint does not describe what is classically referred to as a "design" constraint but has the role of a property, requirement, or a validation result. It is a requirement if this TimingConstraint refines a Requirement (by the Refine relationship). The TimingConstraint is a validation result if it realizes a VVActualOutcome, it is an intended validation result if it realizes a VVIntendedOutcome, and in other cases it denotes a property.<br/>