Specification of time-based mapping constraints.

Item Summary
Name	Type	Multiplicity	Description
description	property string	[0,1]	Free-form textual description of the object.
referenceTime	property VariableBindingDefinitionType	[0,1]
offset	property duration	[0,1]
expression	property ExpressionType	[0,1]	Expression that is supposed to return the timestamp.

Items
- description
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  Free-form textual description of the object. It is supposed to describe the object or a construct that it is attached to.
  
  Anything that the system administrator wants may be here. The system will not interpret the information except for displaying it and allow user to edit it.
- referenceTime
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
- offset
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
- expression
  
  Flags: RAM,runtime
  
  Multiplicity: [0,1]
  
  Expression that is supposed to return the timestamp. The expression may return null. In that case the time constraint will be considered unsatisfied.