[xsl] Sorting under for-each-group

Subject: [xsl] Sorting under for-each-group
From: "Mark Wilson" <drmark@xxxxxxxxxxxxxxx>
Date: Tue, 8 Aug 2006 09:52:18 -0400
The Stylesheet below does most of what I want -- It groups all of the
entries for a single Subject under a single subject heading. I would like to
subsort under each group (Subject) first by author then by title, and if
possible, when there is/are no author/authors, by title alone. The example would put the Kolar book first, then the Siegar Book, both under the single heading "Catalogs. Austria".

I have spent a lot of time on it but have not been able to solve the sort
within groupings problem. Can someone help?
stylesheet and xml input sample below


<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
<xsl:template match="/">
       <xsl:for-each-group select="/List/Entry" group-by="Subject">
           <xsl:copy-of select="Subject"/>
           <xsl:for-each select="current-group()">
               <xsl:copy-of select="*[not(self::Subject)]"/>

- <List>
   - <Entry>
         <Subject>Catalogs. Austria</Subject>
         <Author>Sieger, Hermann Walter</Author>
       - <Book>
             <Title>Zeppelinpost spezial-katalog</Title>
   -  </Entry>
   - <Entry>
     <Subject>Catalogs. Austria</Subject>
     <Author>Kolar, Hugo</Author>
   - <Book>
         <Title>Katalog znamok Rakzsko 1850-1918</Title>

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