Class UML 2.3::InformationItem
Description:
An information item is an abstraction of all kinds of information that
can be exchanged between objects. It is a kind of classifier intended for
representing information in a very abstract way, one which cannot be instantiated.
Direct Superclasses: ClassifierDirect Subclasses: Class Precedence List: InformationItem,
Classifier,
TemplateableElement,
Type,
PackageableElement,
ParameterableElement,
Namespace,
RedefinableElement,
NamedElement,
ElementProperties:
represented :
Classifier (0 *); -- source
InformationItem attribute :
Property (0 *); -- source
Classifier collaborationUse :
CollaborationUse (0 *); -- source
Classifier feature :
Feature (0 *); -- source
Classifier general :
Classifier (0 *); -- source
Classifier generalization :
Generalization (0 *); -- source
Classifier inheritedMember :
NamedElement (0 *); -- source
Classifier isAbstract : Boolean (1 1); -- source
Classifier isFinalSpecialization : Boolean (1 1); -- source
Classifier ownedTemplateSignature :
RedefinableTemplateSignature (0 1); -- source
Classifier ownedUseCase :
UseCase (0 *); -- source
Classifier powertypeExtent :
GeneralizationSet (0 *); -- source
Classifier redefinedClassifier :
Classifier (0 *); -- source
Classifier representation :
CollaborationUse (0 1); -- source
Classifier substitution :
Substitution (0 *); -- source
Classifier templateParameter :
ClassifierTemplateParameter (0 1); -- source
Classifier useCase :
UseCase (0 *); -- source
Classifier templateBinding :
TemplateBinding (0 *); -- source
TemplateableElement package :
Package (0 1); -- source
Type visibility :
VisibilityKind (1 1); -- source
PackageableElement owningTemplateParameter :
TemplateParameter (0 1); -- source
ParameterableElement elementImport :
ElementImport (0 *); -- source
Namespace importedMember :
PackageableElement (0 *); -- source
Namespace member :
NamedElement (0 *); -- source
Namespace ownedMember :
NamedElement (0 *); -- source
Namespace ownedRule :
Constraint (0 *); -- source
Namespace Specifies a set of Constraints owned by this Namespace.
{
composite}
Subsets: Namespace.ownedMember
Opposite: Constraint.context
packageImport :
PackageImport (0 *); -- source
Namespace isLeaf : Boolean (1 1); -- source
RedefinableElement redefinedElement :
RedefinableElement (0 *); -- source
RedefinableElement redefinitionContext :
Classifier (0 *); -- source
RedefinableElement clientDependency :
Dependency (0 *); -- source
NamedElement name : String (0 1); -- source
NamedElement nameExpression :
StringExpression (0 1); -- source
NamedElement namespace :
Namespace (0 1); -- source
NamedElement qualifiedName : String (0 1); -- source
NamedElement ownedComment :
Comment (0 *); -- source
Element ownedElement :
Element (0 *); -- source
Element owner :
Element (0 1); -- source
ElementConstraints:
Signature: sources_and_targets() : Boolean;
Description: The sources and targets of an information item (its related information
flows) must designate subsets of the sources and targets of the representation
information item, if any.The Classifiers that can realize an information
item can only be of the following kind: Class, Interface, InformationItem,
Signal, Component.
The OCL used here is not normative.Editor's notes: No property informationFlow.
Expression: true
Original: (self.represented->select(p | p->oclIsKindOf(InformationItem))->forAll(p |
p.informationFlow.source->forAll(q | self.informationFlow.source->include(q)) and
p.informationFlow.target->forAll(q | self.informationFlow.target->include(q)))) and
(self.represented->forAll(p | p->oclIsKindOf(Class) or oclIsKindOf(Interface) or
oclIsKindOf(InformationItem) or oclIsKindOf(Signal) or oclIsKindOf(Component)))
Signature: not_instantiable() : Boolean;
Description: It is not instantiable.
The OCL used here is not normative.Editor's notes: I think that this constraint confuses cmof:Classifier.isAbstract with uml:Classifier.isAbstract.
The former is used in the UML metamodel to specify that populations governed by the metamodel shall
not contain members of the type that are not specialized to a concrete type. The latter is used
by UML modelers in *their* domain of discourse for the same purpose. No OCL is needed, rather
InformationItem should be cmof:Classifier.isAbstract=true, if that is desired.
Expression: true
Original: isAbstract
Signature: has_no() : Boolean;
Description: An informationItem has no feature, no generalization, and no associations.
Expression: self.generalization->isEmpty() and self.feature->isEmpty()
Operations:
No additional operations.
Send questions or comments to
[email protected].