$ xsltproc -o toc.html ncx2html.xsl toc.ncx
$ perl -Cio -pi -e 's/([^\x00-\x7f])/sprintf("&#%d;", ord($1))/ge;' toc.html
<?xml version="1.0" encoding="ISO-8859-1"?>
<!-- ncx2html: An (incomplete) XML stylesheet to transform NCX to HTML. -->
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:ncx="http://www.daisy.org/z3986/2005/ncx/">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="/ncx:ncx">
<html>
<body>
<h1><xsl:value-of select="ncx:docTitle/ncx:text"/>: Contents</h1>
<p>
<xsl:if test="ncx:navMap/ncx:navPoint">
<ul>
<xsl:apply-templates select="ncx:navMap/ncx:navPoint"/>
</ul>
</xsl:if>
</p>
</body>
</html>
</xsl:template>
<xsl:template match="ncx:navPoint">
<li>
<a href="{ncx:content/@src}">
<xsl:value-of select="ncx:navLabel"/>
</a>
<br/>
<xsl:if test="ncx:navPoint">
<ul>
<xsl:apply-templates select="ncx:navPoint"/>
</ul>
</xsl:if>
</li>
</xsl:template>
</xsl:stylesheet>