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  1. OMG Issue

UML14 — UML's use of the word "unique" for multiplicity is ambiguous

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  • Key: UML14-133
  • Legacy Issue Number: 5976
  • Status: closed  
  • Source: Google ( Don Baisley)
  • Summary:

    UML's use of the word "unique" for multiplicity is ambiguous. It means
    "distinct", but it could be mistaken to mean "unique across all instances".
    For example, if someone says that the employee-number attribute of employee
    is unique, it would likely be understood to mean that each employee has an
    employee-number that is different from every other employee. But that's not
    what UML defines "unique" to mean. I recommend that the FTF change
    "

    {unique}

    " to "

    {distinct}

    " or "

    {set}

    ".
  • Reported: UML 1.5 — Thu, 19 Jun 2003 04:00 GMT
  • Disposition: Resolved — UML 1.4.2
  • Disposition Summary:

    No Data Available
  • Updated: Fri, 6 Mar 2015 20:58 GMT