Issue 326: Qualify attributes

I raised this issue[1] at last call. The proposal is that we qualify all
attributes in our spec. This means making the id and ref attribute
information items qualified. This brings them into line with itemType
and arraySize ( and mustUnderstand and role ).

Discussion?

Gudge

[1] http://www.w3.org/2000/xp/Group/xmlp-lc-issues.html#x326