Alternatives for new specifications of context

Hi folks,

Okay, before I make my code changes I'd like to address Paul's two
concerns regarding duplicate element/attribute names, and two ways to
specify context.

Here is the status quo, where the first is an attribute (the others
are elements)document-wide, the second is a union, the third is
typical, the fourth needs more specific context than the third, the
fifth is document-wide and a union:

A:

Option B: - changing only the element names to avoid ambiguity:

Option C: - removing context= (necessitating xpath= when not full
document context) and keeping