A literal null specifies the lack of a value.
Description
A literal null is used to represent null, i.e., the absence of a value.
Attributes
No additional attributes.
Associations
No additional associations.
Constraints
No additional constraints.
Additional Operation
The query isComputable() is redefined to be true.
LiteralBoolean::isComputable(): Boolean; isComputable = true
The query isNull() returns true. LiteralNull::isNull() : Boolean; isNull = true
Semantics
LiteralNull is intended to be used to explicitly model the lack of a value.
Notation
Notation for LiteralNull varies depending on where it is used. It often appears as the word ‘null’. Other notations are described for specific uses.