| Previous | UML Classes | Table of Contents | UML Packages | Next |
An extension end is used to tie an extension to a stereotype when extending a metaclass.
•
InfrastructureLibrary::Constructs::Property
Description
ExtensionEnd is a kind of Property that is always typed by a Stereotype .An ExtensionEnd is never navigable. If it was navigable, it would be a property of the extended classifier. Since a profile
is not allowed to change the referenced metamodel, it is not possible to add properties to the extended classifier. As a consequence, an ExtensionEnd can only be owned by an Extension.The aggregation of an ExtensionEnd is always composite.The default multiplicity of an ExtensionEnd is 0..1.
Attributes
No additional attributes
Associations
Issue 8600 -replace ‘Property’ by ‘TypedElement ’ in subset constraint
• |
type: Stereotype [1] References the type of the ExtensionEnd . Note that this association restricts the possible types |
||||
| of an ExtensionEnd to only be Stereotype s. {Redefines TypedElement ::type}. | |||||
| Constraints |
[1] The multiplicity of ExtensionEnd is 0..1 or 1.
(self->lowerBound() = 0 or self->lowerBound() = 1) and self->upperBound() = 1
[2] The aggregation of an ExtensionEnd is composite.
self.aggregation = #composite
Additional Operations
Issue 8600 -clarify lower bound rule
[1] The query lowerBound() returns the lower bound of the multiplicity as an Integer. This is a redefinition of the default
lower bound, which, if empty, normally evaluates to 1 for MulticplicityElements.
Issue 8081 -Remove erroneous set of square brackets.
ExtensionEnd ::lowerBound() : Integer;lowerBound = if lowerValue->isEmpty() then 0 else lowerValue->IntegerValue() endif
Semantics
No additional semantics
Notation
No additional notation
Examples
See
Class (from Profiles ) on page 683.
Changes from previous UML
ExtensionEnd did not exist as a metaclass in UML 1.4. See Class (from Profiles ) on page 683 for further details.