Class UML 2.4.1::Extension
Description:
An extension is used to indicate that the properties of a metaclass are
extended through a stereotype, and gives the ability to flexibly add (and
later remove) stereotypes to classes.
Direct Superclasses: AssociationDirect Subclasses: Class Precedence List: Extension,
Association,
Classifier,
Namespace,
Type,
PackageableElement,
ParameterableElement,
RedefinableElement,
NamedElement,
TemplateableElement,
Relationship,
ElementProperties:
![](/se-interop/image/down-arrow.png)
isRequired : Boolean (1 1); -- source
Extension![](/se-interop/image/down-arrow.png)
metaclass :
Class (1 1); -- source
Extension![](/se-interop/image/down-arrow.png)
ownedEnd :
ExtensionEnd (1 1); -- source
Extension![](/se-interop/image/down-arrow.png)
endType :
Type (1 *); -- source
Association![](/se-interop/image/down-arrow.png)
isDerived : Boolean (1 1); -- source
Association![](/se-interop/image/down-arrow.png)
memberEnd :
Property (2 *); -- source
Association![](/se-interop/image/down-arrow.png)
navigableOwnedEnd :
Property (0 *); -- source
Association![](/se-interop/image/down-arrow.png)
attribute :
Property (0 *); -- source
Classifier![](/se-interop/image/right-arrow.png)
collaborationUse :
CollaborationUse (0 *); -- source
ClassifierReferences the collaboration uses owned by the classifier.
{
composite}
Subsets: Element.ownedElement
![](/se-interop/image/down-arrow.png)
feature :
Feature (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
general :
Classifier (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
generalization :
Generalization (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
inheritedMember :
NamedElement (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
isAbstract : Boolean (1 1); -- source
Classifier![](/se-interop/image/down-arrow.png)
isFinalSpecialization : Boolean (1 1); -- source
Classifier![](/se-interop/image/down-arrow.png)
ownedTemplateSignature :
RedefinableTemplateSignature (0 1); -- source
Classifier![](/se-interop/image/down-arrow.png)
ownedUseCase :
UseCase (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
powertypeExtent :
GeneralizationSet (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
redefinedClassifier :
Classifier (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
representation :
CollaborationUse (0 1); -- source
Classifier![](/se-interop/image/down-arrow.png)
substitution :
Substitution (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
templateParameter :
ClassifierTemplateParameter (0 1); -- source
Classifier![](/se-interop/image/down-arrow.png)
useCase :
UseCase (0 *); -- source
Classifier![](/se-interop/image/down-arrow.png)
elementImport :
ElementImport (0 *); -- source
Namespace![](/se-interop/image/right-arrow.png)
importedMember :
PackageableElement (0 *); -- source
NamespaceReferences the PackageableElements that are members of this Namespace as
a result of either PackageImports or ElementImports.
{
readonly,
derived}
Subsets: Namespace.member
![](/se-interop/image/down-arrow.png)
member :
NamedElement (0 *); -- source
Namespace![](/se-interop/image/down-arrow.png)
ownedMember :
NamedElement (0 *); -- source
Namespace![](/se-interop/image/down-arrow.png)
ownedRule :
Constraint (0 *); -- source
Namespace![](/se-interop/image/down-arrow.png)
packageImport :
PackageImport (0 *); -- source
Namespace![](/se-interop/image/down-arrow.png)
package :
Package (0 1); -- source
Type![](/se-interop/image/down-arrow.png)
visibility :
VisibilityKind (1 1); -- source
PackageableElement![](/se-interop/image/down-arrow.png)
owningTemplateParameter :
TemplateParameter (0 1); -- source
ParameterableElement![](/se-interop/image/down-arrow.png)
isLeaf : Boolean (1 1); -- source
RedefinableElement![](/se-interop/image/down-arrow.png)
redefinedElement :
RedefinableElement (0 *); -- source
RedefinableElement![](/se-interop/image/down-arrow.png)
redefinitionContext :
Classifier (0 *); -- source
RedefinableElement![](/se-interop/image/down-arrow.png)
clientDependency :
Dependency (0 *); -- source
NamedElement![](/se-interop/image/down-arrow.png)
name : String (0 1); -- source
NamedElement![](/se-interop/image/down-arrow.png)
nameExpression :
StringExpression (0 1); -- source
NamedElement![](/se-interop/image/down-arrow.png)
namespace :
Namespace (0 1); -- source
NamedElement![](/se-interop/image/down-arrow.png)
qualifiedName : String (0 1); -- source
NamedElement![](/se-interop/image/down-arrow.png)
templateBinding :
TemplateBinding (0 *); -- source
TemplateableElement![](/se-interop/image/down-arrow.png)
relatedElement :
Element (1 *); -- source
Relationship![](/se-interop/image/down-arrow.png)
ownedComment :
Comment (0 *); -- source
Element![](/se-interop/image/down-arrow.png)
ownedElement :
Element (0 *); -- source
Element![](/se-interop/image/down-arrow.png)
owner :
Element (0 1); -- source
ElementConstraints:
Signature: non_owned_end() : Boolean;
Description: The non-owned end of an Extension is typed by a Class.
The OCL used here is not normative.Editor's notes: metaclass, not metaclass(). Classifier, not class
Expression: metaclass->notEmpty() and metaclass.oclIsKindOf(Classifier)
Original: metaclassEnd()->notEmpty() and metaclass()->oclIsKindOf(Class)
Signature: is_binary() : Boolean;
Description: An Extension is binary, i.e., it has only two memberEnds.
Expression: memberEnd->size() = 2
Operations:
Signature: metaclassEnd() : Property;
Description: The query metaclassEnd() returns the Property that is typed by a metaclass
(as opposed to a stereotype).
The OCL used here is not normative.Editor's notes: Expression: result = (memberEnd - OrderedSet{ownedEnd}).asOrderedSet()->first()
Original: result = memberEnd->reject(ownedEnd)
Signature: metaclass.1() : Class;
Description: The query metaclass() returns the metaclass that is being extended (as
opposed to the extending stereotype).
Expression: result = metaclassEnd().type
Signature: isRequired.1() : Boolean;
Description: The query isRequired() is true if the owned end has a multiplicity with
the lower bound of 1.
Expression: result = (ownedEnd->lowerBound() = 1)
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