[DDI-users] InParameter/OutParameter and Binding in Questionnaires

[Wackerow, Joachim]

I'm wondering where the binding can be specified and which way is best to support reusability of QuestionItems.

This topic is documented in the Technical Documentation of DDI 3.2. There is a related diagram on page 35 (and a related example XML file InOutBindingExample). This explains that binding is done in a chain from Question 1 up to the Sequence and then down again to Question 2. This shows all possibilities of defining bindings in this case.

A simpler way would be to define the binding of directly in the Sequence (the OutParameter of Question 1 and the InParameter of Question 2). Then all other bindings are not necessary and the questions are totally reusable. This would also correspond to the actual use of these two questions in the sequence. Only then the binding is important.

Are there any disadvantages to use this option?


A more general thought: a definition of a binding is probably mostly of local use (here for questions in a sequence). Therefore it can conflict with the idea of reusability. In this sense, a better location for binding definitions would be an independent scheme. On the other hand, if the sequence should be reused like it is it makes sense to have the binding definition in the sequence.

Achim





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