Let me give a bit of background to the use case motivating the question. I want to find all reviews written by people that only wrote 1 review. I wrote
collection($sp:reviewsColl)/descendant::reviews[not(review[2])] but reviews has a @person attribute and that person may have 1 or more reviews in another collection - so that doesn't work. The thing that seemed most natural to fix this was to supplement the predicate to say there should be no sibling review by the same reviews/@person. On Sun, Jan 5, 2014 at 8:54 PM, Michael Kay <[email protected]> wrote: > > 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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