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]