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A literal null specifies the lack of a value.
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LiteralSpecification (from Kernel ) on page 93
A literal null is used to represent null (i.e., the absence of a value).
No additional attributes
No additional associations
No additional constraints
[1] The query isComputable() is redefined to be true.
LiteralNull ::isComputable(): Boolean;isComputable = true
[2] The query isNull() returns true.
LiteralNull ::isNull() : Boolean;isNull = true
LiteralNull is intended to be used to explicitly model the lack of a value.
Notation for LiteralNull varies depending on where it is used. It often appears as the word ‘null.’ Other notations are described
for specific uses.