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CSCR-050 Make ObservationRange.negationInd and Criterion.negationInd optional

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Submitted by: Rik Smithies Revision date: 12-Feb-2006
Submitted date: 12-Feb-2006 Change request ID: CSCR-050


ObservationRange.negationInd and Criterion.negationInd are [1..1] required


  • Change ObservationRange.negationInd and Criterion.negationInd to be [0..1] optional


Terminfo guidance and thinking in NHS/UK domain, rules out the use of negationInd when act.code contains a code from a scheme that already encompasses negation (eg SnomedCT). Currently negationInd cannot be refined out in models that mandate such a coding scheme, leading to potential inconsistency.


Negation is a liabilty. If not using SNOMED you still need to say it.

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