An association defines a classification over a set of links, through a relationship between Classifiers. Each link which is an instance of the association denotes a connection between object instances of the Classifiers of the Association. The MOF restricts associations to binary, restricting each link to two participating objects. This restriction also means that the association is defined between two Classifiers (which may be the same Classifier). The name of the Association is considered directional if it
provides a clearer or more accurate representation of the association when stated with one participating class first rather than the other. For instance, Operation CanRaise Exception is correct; Exception CanRaise Operation is incorrect.

The definition of an Association requires two AssociationEnds. If the name of the association is directional, the name is understood to read in the order: first contained element; association name; second contained element. These contained elements are AssociationEnd instances, and the reading of the subject; verb; object uses either the AssociationEnd name or the AssociationEnd's class name. The onus is on the MOF user to determine whether the name is directional, and to place the AssociationEnds in proper order within the Association's contents to support the name direction. The representation of a Classifier's knowledge of its participation in an association requires the use of a Reference.

Attributes
Primitive Type boolean	isDerived	A derived association has no Links as instances. Instead, its Links are derived from other information in a meta-model. The addition, removal, or modification of a derived Association's Link causes the information upon which the Association is derived to be updated. The results of such an update are expected to appear, upon subsequent access of the derived Association's Links, to have the same effect as an equivalent operation on an Association which is not derived.

 isDerived

public Primitive Type boolean isDerived

A derived association has no Links as instances. Instead, its Links are derived from other information in a meta-model. The addition, removal, or modification of a derived Association's Link causes the information upon which the Association is
derived to be updated. The results of such an update are expected to appear, upon subsequent access of the derived Association's Links, to have the same effect as an equivalent operation on an Association which is not derived.

Properties:

Aggregation	none
Alias
Association
Association End
Class	Class Association
Collections
Datatype
Default
Default Value
Is Composite	false
Is Derived	false
Is Derived Union	false
Is Leaf	false
Is Ordered	false
Is Read Only	false
Is Static	false
Is Unique	true
Keywords
Lower	1
Lower Value
Multiplicity	1
Name	isDerived
Name Expression
Opposite
Owned Template Signature
Owner	Class Association
Owning Association
Owning Parameter
Qualified Name	model1::model1::Association::isDerived
Stereotype
Template Parameter
Type	Primitive Type boolean
Upper	1
Upper Value
Visibility	public

• An association defines a classification over a set of links, through a relationship between Classifiers. Each link which is an instance of the association denotes a connection between object instances of the Classifiers of the Association. The MOF restricts associations to binary, restricting each link to two participating objects. This restriction also means that the association is defined between two Classifiers (which may be the same Classifier). The name of the Association is considered directional if it
  provides a clearer or more accurate representation of the association when stated with one participating class first rather than the other. For instance, Operation CanRaise Exception is correct; Exception CanRaise Operation is incorrect.
  

  
  The definition of an Association requires two AssociationEnds. If the name of the association is directional, the name is understood to read in the order: first contained element; association name; second contained element. These contained elements are AssociationEnd instances, and the reading of the subject; verb; object uses either the AssociationEnd name or the AssociationEnd's class name. The onus is on the MOF user to determine whether the name is directional, and to place the AssociationEnds in proper order within the Association's contents to support the name direction. The representation of a Classifier's knowledge of its participation in an association requires the use of a Reference.