The spec is not clear on whether decimal, integer, and nonNegativeInteger support representation='binary' with binaryNumberRep='binary' (aka twos-complement). Since these types do not have any size limit, such a capability allows arbitrarily large twos-complement integers, or perhaps it would be an implementation defined limit.

I believe the right choice is that it should be disallowed. That is, only binaryNumberRep of 'bcd' or 'packed' should be allowed for these types. These types have always been about decimal-style representations to me.

This keeps twos-complement only for the types long, int, short, byte and their unsigned counterparts.

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Mike Beckerle | OGF DFDL WG Co-Chair 
Tel:  781-330-0412