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Defining a Variable

Defining an Expression

An expression is defined in a separate Questionnaire.item (or recursively, Questionnaire.item.item) which shall have:

  • Questionnaire.item.readOnly set to true

  • Questionnaire.item.type set to decimal

The expression itself is defined in the extension sdc-questionnaire-calculatedExpression.

Info

In case the expression is defined using one or more Questionnaire.item that are not guaranteed to be present in a well-formed QuestionnaireResponse, it should be defined as not required.

A Questionnaire.item is not guaranteed to be present when either:

  • it is not required

  • it depends on other answer(s) (with Questionnaire.item.enableWhen)

  • it is placed in a group nesting structure which has enableWhen itself

Releasing a Questionnaire

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