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A LiteralNull is intended to be used to explicitly model the lack of a value.

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UML2 ValueSpecification - metaclasses - ADVANCED REFERENCE ONLY
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Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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SEMANTIC
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LiteralNull
value
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A LiteralNull is intended to be used to explicitly model the lack of a value.
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LiteralNull: In the context of a MultiplicityElement with a multiplicity lower bound of 0, this corresponds to the empty set (i.e., a set of no values). It is equivalent to specifying no values for the Element.
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The notation for a LiteralNull varies depending on where it is used. It often appears as the word “null.” Other notations are described elsewhere for specific uses.
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