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  <xsl:template match="buchhandel">
    
    <xsl:apply-templates select="buchwahl">
      <xsl:sort select="@ersch-jahr" order="descending"/> <!-- ascending -->
      <xsl:sort select="buchautor[1]"/>
    </xsl:apply-templates>
    
  </xsl:template>
  
  <xsl:template match="buchwahl">
    ...
  </xsl:template>