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  1. OMG Issue

UML22 — UML's support for null values and semantics is unclear

  • Key: UML22-207
  • Legacy Issue Number: 9700
  • Status: closed  
  • Source: UK Ltd ( Pete Rivett)
  • Summary:

    UML's support for null values and semantics is unclear.
    For example if a Property is defined [1..1] then is a value of null (represented by LiteralNull) permitted? (LiteralNull is defined as "LiteralNull is intended to be used to explicitly model the lack of a value.")
    Can null values be used to create a sparse array? If not how is a fixed length sparse array to be modeled?
    Can a unique multivalued property contain multiple nulls?
    How do the StructuralFeatureActions react in the presence of null?
    [Note that the issue is NOT related to the "null token"]

  • Reported: UML 2.0 — Thu, 4 May 2006 04:00 GMT
  • Disposition: Resolved — UML 2.2
  • Disposition Summary:

    No Data Available

  • Updated: Fri, 6 Mar 2015 20:58 GMT