On 5 Jan 2014, at 16:50, Ihe Onwuka <[email protected]> wrote:

> If x is the document element of a document in a collection, is it the sibling 
> of y that is the document element of another document in the same collection?

No.
> 
> If not why not?

"Why" questions are very difficult to answer. Do you want a historically 
accurate answer (was the question debated at a WG meeting, who argued which 
position, how did the vote go, and why did individual members vote as they 
did?) - because it's very rarely possible to give one. Or do you want a 
post-hoc justification (can you think of a sensible reason that anyone might 
have designed it this way?)

One post-hoc justification is that collections are unordered, whereas axes are 
always ordered.

Another is that documents may belong to more than one collection.

Michael Kay
Saxonica


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