re xsl:Key

Hello, 

I use for my example a typical bibliography document, ie
<biblio..>
<reference><authors><p first=".." last=".."/></authors>
     <title> (...)
</reference>

size ~(5Mo)

        
Here are parts of stylesheets that I use: 
withIndex :
key declaration
<xsl:key name="clef2" match="//reference" use="authors/p/@last">

<xsl:for-each select='key("clef2","zorro")'>
        <li><xsl:value-of select="title"/></li>
</xsl:for-each>


noIndex 
<xsl:for-each select="//reference/authors/p[(_at_)last='zorro']">
        <li><xsl:value-of select=".../../title"/></li>
</xsl:for-each>

Some of my results (execution Time)


  
                   withIndex               noIndex
Xalan2.5             8780ms                 9108ms     
Saxon6.5.2  tree     2800ms                 2900ms
 "          tinytree 3021ms                 1757ms   !!!!


Could you explain me  differences between tree and tinytree implementation. 

phil. Dubreuil
Inria Rhone Alpes
France     

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list