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Foundation: atTime

This concept is a MESSAGE-relationship whose attributes are specialised as follows:

• the subject attribute is of type TimePoint
• the object attribute is of (abstract) datatype, time (denoting a point on the system history time-line)

atTime is a function (UML Association) that maps instances of TimePoint classes to 'tokens' representing points on the system time line. It is included in the MESSAGE meta-model to:

• help establish a temporal semantics similar to that often used in AI-based agent languages and theories
• allow temporal constraints to be expressed (e.g. Task A must be completed before Task B begins)
• allow explicit representation of time should this be required

See also

• TemporalRelationship
• TimePoint