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  1. OMG Issue

OCL25 — Align OCL bodyExpression and UML bodyCondition

  • Key: OCL25-118
  • Legacy Issue Number: 18254
  • Status: open  
  • Source: Model Driven Solutions ( Ed Willink)
  • Summary:

    OCL 12.10 awaits alignment with the UML 2.0 metamodel.

    Consequently, the relationship between a result-valued OCL bodyExpression and a Boolean-valued UML bodyCondition is unspecified. A common pragmatic resolution has been to equate the two and ignore the Boolean-valued requirement of a UML Constraint.

    In order to accommodate prevailing practice and also support UML's multiple out/inouts, suggest:

    Reinterpret the grammar

    prePostOrBodyDeclCS ::= ‘body’ (simpleNameCS)? ‘:’ OclExpressionCS

    such that

    the simpleNameCS is the name of the return parameter with 'result' as the anonymous default

    OclExpressionCS is a result-valued bodyExpression if OclExpressionCS does not reference the simpleNameCS or its defgault.
    OclExpressionCS is a Boolean-valued bodyCondition if the return parameter is referenced.

    [Allow multiple body declarations.]

    Thus

    "body: ..." is a shortform of "body result: ..." which is a shortform for "body result: result = ..."

    and

    body: ...
    body A: ...
    body B: ...

    could be the specification of a UML operation

    f(out a : A, inout b : B, in c : C) : Z

  • Reported: OCL 2.3.1 — Fri, 9 Nov 2012 05:00 GMT
  • Updated: Thu, 8 Oct 2015 14:12 GMT