Münch-Methode, for-each schachteln?

[Thomas J.S.]

...

<xsl:for-each select="buch[generate-id(.) = generate-id(key('first_letter_autor', substring(autor, 1, 1))[1])]">
      <xsl:sort select="substring(autor, 1, 1)" data-type="text" order="ascending"/>
      fo:block
       <xsl:value-of select="substring(autor, 1, 1)"/>
      </fo:block>
      <xsl:for-each select="key('first_letter_autor', substring(autor, 1, 1))">
       fo:block
        <xsl:value-of select="autor"/>
       </fo:block>
      </xsl:for-each>
     </xsl:for-each>

liefert:
         fo:blockH</fo:block>
         fo:blockHofmann Corinne</fo:block>
         fo:blockK</fo:block>
         fo:blockKing Stephen</fo:block>
         fo:blockKing Stephen</fo:block>
         fo:blockKing Stephen</fo:block>

----------------------
<xsl:for-each select="buch[generate-id(.) = generate-id(key('first_letter_autor', substring(autor, 1, 1))[1])]">
      <xsl:sort select="substring(autor, 1, 1)" data-type="text" order="ascending"/>
      fo:block
       <xsl:value-of select="substring(autor, 1, 1)"/>
      </fo:block>
      <xsl:for-each select="key('first_letter_autor', substring(autor, 1, 1))[1]">
       fo:block
        <xsl:value-of select="autor"/>
       </fo:block>
      </xsl:for-each>
     </xsl:for-each>

liefert:
        fo:blockH</fo:block>
         fo:blockHofmann Corinne</fo:block>
         fo:blockK</fo:block>
         fo:blockKing Stephen</fo:block>

Thomas