[xsl] What's wrong with a variable inside a xsl:when ?

Hi Folks,

i have a problem with defining a variable inside a when element.

If i write it this way, so that the variable is outside everything is  
fine with saxon.
  <xsl:function name="mt:check_the_next">
    <xsl:param name="kind"/>
    <xsl:param name="lemma"/>

    <xsl:variable name="translation_adja"  
select="mt:lexicon_adjectives('texanisch')"/>
    <xsl:choose>
      <xsl:when test="$kind = 'ADJA'">
        .       
        .
        .

  </xsl:function>

But if i write it this way,

  <xsl:function name="mt:check_the_next">
    <xsl:param name="kind"/>
    <xsl:param name="lemma"/>

    <xsl:choose>
      <xsl:when test="$kind = 'ADJA'">

         <xsl:variable name="translation_adja"  
select="mt:lexicon_adjectives('texanisch')"/>
        .       
        .
        .

  </xsl:function>


so that the variable is inside my when element saxon does nothing.
It just tells me the following:
Warning: at xsl:variable on line 22 of file:/Users/jeckyll/studium/au/ 
project/norman/norman_neu.xsl:
  SXWN9001: A variable with no following sibling instructions has no  
effect

I don't know what to o because the failure that there are no siblings  
is not correct i think because the value is choosen.
Pleas help me xsl-List members :) I need that variable inside my when  
element so i can use a different function then inside another when  
element.
What am i doing wrong ?


cheers,

norman


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