A table of contents can be automatically inserted into a document to generate a list of the chapters or other important sections in the document. This feature is usually used together with cross references to add links to a table of contents. With the addition of counters, it can be complemented with the page numbers of the linked chapters.

A table of contents is created by using an XSL style sheet for the transformation of the document and a CSS style sheet to style the elements being added by the transformation.

The following sample of an XSL stylesheet generates a simple table of contents based on <h1> and <h2> tags in the document.

<xsl:template match="body">
    <xsl:copy>
        <h1><xsl:apply-templates select="//title//text()" /></h1>
        <h2>Table of Contents</h2>
        <table class="toc">
	        <xsl:for-each select=".//h1|.//h2">
                <xsl:if test="name(.)='h1'">
                    <tr>
                    <td><xsl:apply-templates/></td>
                    </tr>
                </xsl:if>
                <xsl:if test="name(.)='h2'">
                    <tr>
                    <td><xsl:apply-templates/></td>
                    </tr>
                </xsl:if>
            </xsl:for-each>
        </table>
        <xsl:apply-templates/>
        <xsl:apply-templates select="@*"/>
    </xsl:copy>
</xsl:template>

In order to generate a table of contents using PDFreactor, there are two possibilities:

If you use the command line, you can set an XSL stylesheet as follows:

java -jar pdfreactor.jar -a links bookmarks -s file:///C:/style.css 
-X file:///C:/xsl-style.xsl sample.html C:/sample.pdf

Here is an example using the PHP-API:

$pdfreactor->addXSLTStyleSheet(null, "style.xsl");

The table of contents added in the document can be styled using CSS:

table.toc {
    border: hidden;
    page-break-after: always;
}