THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Restricting IVC/OVC in Unordered Sequences
TBD: implementation of unordered sequences is raising issues here. Just restricting this usage may be the right choices.
Elements having IVC are not allowed as the root of a choice branch. For the same reasons IVC elements should not be allowed as children of an unordered sequence, or a sequence with floating elements.
Unparsing and Choice Groups, Especially Hidden Choice Groups
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