string treated as sequence

[sandrocchio_0.1]

I've got this function which is giving me some strange errors during debug.

xquery.xq
Severity: fatal
Description: A sequence of more than one item is not allowed as the first argument of string-length() ("Abonnement...", "film...", ...)
Start location: 315:0
URL: http://www.w3.org/TR/xpath20/#ERRXPTY0004

Either the parameters and return value are raw string, so why is treating them as sequence?

Code: Select all

declare function local:normalizeSourceHelper(

    $sourceString as xs:string, 

    $compareString as xs:string) 

    as xs:string* {

    let $result :=

        	let $arraySource := tokenize($sourceString, ";")

        	let $arraycompare := tokenize($compareString, ";")

        	for $source in $arraySource

        	where $source != ""

        	return 

        	  if(count( 

        	          for $compare in $arraycompare

        	          where $compare = $source return (1))=0 ) 

        	  then concat(data($source), ";")

                else

              	""

    return  

    if(string-length($result)>0) then common:removeLastSemiColumnChar($result)

    else $result

};

[adrian]

Hello,

The error complains about the argument of string-length() being a sequence. The argument is $result. Now look at the value assigned to $result:

Code: Select all

let $result :=

           let $arraySource := tokenize($sourceString, ";")

           let $arraycompare := tokenize($compareString, ";")

           for $source in $arraySource

           where $source != ""

           return

             if(count(

                     for $compare in $arraycompare

                     where $compare = $source return (1))=0 )

             then concat(data($source), ";")

                else

                 ""

It's the result of a for which creates a sequence. Ir may be a sequence of strings, but it's still a sequence, hence the problem.

Regards,
Adrian

[sandrocchio_0.1]

thanks!