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Similarly, IVC/OVC are not allowed to be declared on simple types. This restriction is also unnecessary and makes reuse harder.

Allowing some DFDL properties to Coexist with IVC

For elements with dfdl:inputValueCalc, the element is not represented, so format properties don't make sense and should cause SDE if expressed directly on the element. However, some properties are completely compatible with dfdl:inputValueCalc. In particular dfdl:choiceBranchKey does not conflict, because it is not a format property.

This restriction in DFDL is easily worked around by wrapping a sequence around the branch element having IVC property, and putting the dfdl:choiceBranchKey on the sequence.

SDE for element in hidden group that has no default, nor dfdl:outputValueCalc

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