Thank you. I'm not wishing to sound uncharitable or rude, but I deliberately didn't ask for a solution because I wanted to focus on the original question.
Consider the use case in the context of someone who did not have access to XQuery 3.0. On Mon, Jan 6, 2014 at 11:38 AM, Michael Kay <[email protected]> wrote: > In XQuery 3.0 > > for $review in collection($sp:reviewsColl)//review > group by $review/@person > where count($review) = 1 > return f:render($review) > > Michael Kay > Saxonica > > > > > On 6 Jan 2014, at 10:58, Ihe Onwuka <[email protected]> wrote: > > Let me give a bit of background to the use case motivating the question. > > I want to find all reviews written by people that only wrote 1 review. I > wrote > > collection($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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