Class UML 2.5::LiteralNull

Description:

A LiteralNull 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 (0 1); -- source PackageableElement
owningTemplateParameter : TemplateParameter (0 1); -- source ParameterableElement
templateParameter : TemplateParameter (0 1); -- source ParameterableElement
clientDependency : Dependency (0 *); -- source NamedElement

Indicates the Dependencies that reference this NamedElement as a client.
{derived}
Opposite: Dependency.client

name : String (0 1); -- source NamedElement
nameExpression : StringExpression (0 1); -- source NamedElement
namespace : Namespace (0 1); -- source NamedElement
qualifiedName : String (0 1); -- source NamedElement

A name that allows the NamedElement to be identified within a hierarchy of nested Namespaces. It is constructed from the names of the containing Namespaces starting at the root of the hierarchy and ending with the name of the NamedElement itself.
{readonly, derived}

ownedComment : Comment (0 *); -- source Element

The Comments owned by this Element.
{composite}
Subsets: Element.ownedElement

ownedElement : Element (0 *); -- source Element
owner : Element (0 1); -- source Element

The Element that owns this Element.
{readonly}
Derived union with sources: (namespace, owningTemplateParameter)
Opposite: Element.ownedElement

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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