Architecting and designing : UML 2.5 : Model Elements : Constraints
  
Constraints
According to the UML specification, a Constraint is an assertion that indicates a restriction that must be satisfied by any valid realization of the model containing the Constraint. A Constraint is attached to a set of constrainedElements, and it represents additional semantic information about those Elements.
There are several types of Constraints:
(Ordinary) Constraint
DurationConstraint
InteractionConstraint
IntervalConstraint
TimeConstraint
How to specify a Constraint
For instructions on how to specify a constraint on a Model Element, see How to create a Constraint and associate it with a Model Element.
See also
Association Node
CollaborationUse
Component
ConnectorNode
Connector Node (Invisible)
Structured Classifiers
Classifiers
TemplateSignature
Comment
Connector Node
Data Types
Dependency Nodes
InformationFlow Node
Instances
Ports
Property
Structured Classifiers
Part
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