Can't disable TOC in book

I have a simple book which contains nothing but a glossary, but I can't seem to disable the TOC.  Here's the small XSL:

<?xml version='1.0'?>
  <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version='1.0'>
    <xsl:output method="html"/>
    <xsl:param name="generate.toc">
      /book nop
    </xsl:param>
    <xsl:include href="file:///c:/home/jbrancier/pkg/emacs-21.3/site-lisp/xae-1.0beta7/doctypes/docbook/styles/docbook/html/docbook.xsl"/>
  </xsl:stylesheet>

Can anyone tell me what I'm missing?  TIA (oh, and I did move the 'include' before the customization as well, with the same results)
Jeff