variable change in xsl:for-each

Hello,

I want the background to change in each cell. But in every cell I only get
the #FFFFFF-background. I think the variable isn't updated in the
choose-procedure. But I don't know why.  Hope you can help.

Thanks!
Markus

Sorry!!! I forget the subject in last mail. So I posted again

heres my xsl-file:

<xsl:variable name="xrowcolor" select="false()"/>
<xsl:variable name="rowcolor">#FFFFFF</xsl:variable>
<xsl:for-each select="//meldungen">
   <xsl:choose>
     <xsl:when test="$xrowcolor">
       <xsl:variable name="rowcolor">#FFFFFF</xsl:variable>
       <xsl:variable name="xrowcolor" select="false()"/>
     </xsl:when>
     <xsl:otherwise>
       <xsl:variable name="rowcolor">#FFFF11</xsl:variable>
       <xsl:variable name="xrowcolor" select="true()"/>
     </xsl:otherwise>
   </xsl:choose>
   <fo:table-cell>
      <fo:block background-color="{$rowcolor}" font-weight="bold">
        <xsl:value-of select="eingang"/>
      </fo:block>
   </fo:table-cell>
</fo:for-each>

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