[basex-talk] Re: unexpected results in typecasting functionresult

Hi Rob, The spec allows processors to optimize code by taking advantage the supplied type information. For example, the following code… let $a as element() := <a/>[. = 'x'] return empty($a) …can (and will) be simplified to a static false() – both by BaseX and Saxon, and possibly other processors – because $a is typed to be a single element. Hope this helps, Christian