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Class UML 2.4.1::LiteralNull

Description:

A literal null specifies the lack of a value.

Direct Superclasses: LiteralSpecification

Direct Subclasses:

Class Precedence List: LiteralNull, LiteralSpecification, ValueSpecification, TypedElement, PackageableElement, ParameterableElement, NamedElement, Element

Properties:

type : Type (0 1); -- source TypedElement
visibility : VisibilityKind (1 1); -- source PackageableElement

Indicates that packageable elements must always have a visibility, i.e., visibility is not optional.
Redefines: NamedElement.visibility
Default value: PUBLIC

owningTemplateParameter : TemplateParameter (0 1); -- source ParameterableElement
templateParameter : TemplateParameter (0 1); -- source ParameterableElement
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 Element

Constraints:

No additional constraints.

Operations:

Signature: isNull() : Boolean;
Description: The query isNull() returns true.
Expression: result = true

Signature: isComputable() : Boolean;
Description: The query isComputable() is redefined to be true.
Expression: result = true



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