Add stylesheet, exclude appendix sections from TOC.
user
```xslt
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format" version="1.0">
    <xsl:param name="use.id.as.filename" select="'1'"/>
    <xsl:param name="admon.graphics" select="'1'"/>
    <xsl:param name="admon.graphics.path"/>
    <xsl:param name="html.stylesheet" select="'../docbook.css'"/>
    <xsl:template match="appendix//section" mode="toc"/>
</xsl:stylesheet>
```
assistant