On 5 Jan 2014, at 20:59, David Lee <[email protected]> wrote: > Given those truths ... > If you do have a sequence from fn:collection() or another function you *can* > find the position of a document in that collection and its 'sibling' > > Note: this may be a horribly inefficient thing to do so buyer beware .... > > let $c := fn:collection(), > $doc := local:pick-a-random-doc( $c ), > $prev := $c[ fn:index-of( $c , $doc ) - 1 ] (: Might be bad to do on > the first or only document :) > return $c > >
This only works if all the documents have distinct string-values. A more efficient and reliable approach would be min(for $c at $i in collection() where $c is $doc return $i) Michael Kay Saxonica _______________________________________________ [email protected] http://x-query.com/mailman/listinfo/talk
