Hi Hans-Jürgen,
Thanks for the observation. A simplified version of your query is:
let $a := 'x' let $b := if($a) then (<a/>, <b/>) else error() return $b/name()
The problem has been fixed in the latest snapshot [1].
Best, Christian
[1] https://files.basex.org/releases/latest/
On Wed, Apr 9, 2025 at 8:29 PM Hans-Juergen Rennau hrennau@yahoo.de wrote:
Dear BaseX people,
I have encountered a bug (?). Please consider this code:
= = = = = = = = = begin = = =
declare namespace f="http://weatherreport.org/heavyweather";
declare function f:relatedNames($node, $relationship) as xs:string* { let $fnName := function($node) { let $_DEBUG := trace(count($node), '#node: ') return name($node)}
let $items := switch($relationship) case 'child' return $node/* default return error() return $items/$fnName(.) => distinct-values() => sort() => string-join(',') };
let $doc := <doc><a/><b/><c/></doc> return f:relatedNames($doc, 'child')
= = = = = = = = = end = = =
= = = = = = = = = output = = = #node: 3 Stopped at C:/projects/foxpath-examples/pre-balisage/problem-basex2.xq, 15/25: [XPTY0004] Item expected, sequence found: (<a/>, <b/>, <c/>). = = = = = = = = = = = = = = = =
The call $fnName(.) receives a single item, but three items arrive at the function item!
With kind regards, Hans-Jürgen
PS: The funny switch() seems to play a part in the game, when I removed it, the issue vanished. PPS: BaseX 11.8 [Standalone]