[F&O] C.2.3 eg:value-except

The description (possibly copied from C.2.1 eg:value-union) says
 
" ...in an undefined order."

However both the xslt and xquery implementations given preserve the input
order. Either the phrase should be dropped or fn:unordered() should be
used in the implementations.

The equivalent comment in C.2.1 does not have this problem as there the
implementations use fn:distinct-values() so do return things in an 
an implementation dependent (rather than undefined) order.

David

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