Controls which section levels are marked for headers or footers.

diff --git a/xsl/params/marker.section.level.xml b/xsl/params/marker.section.level.xml
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+++ b/xsl/params/marker.section.level.xml
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+<refentry id="marker.section.level">
+<refmeta>
+<refentrytitle>marker.section.level</refentrytitle>
+<refmiscinfo role="type">integer</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>marker.section.level</refname>
+<refpurpose>Control depth of sections shown in running headers or footers</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment id='marker.section.level.frag'>
+<xsl:param name="marker.section.level" select="2"/>
+</src:fragment>
+</refsynopsisdiv>
+
+<refsect1><title>Description</title>
+
+<para>The <parameter>marker.section.level</parameter> parameter
+controls the depth of section levels that may be displayed
+in running headers and footers.  For example, if the value
+is 2 (the default), then titles from <sgmltag>sect1</sgmltag> and 
+<sgmltag>sect2</sgmltag> or equivalent <sgmltag>section</sgmltag>
+elements are candidates for use in running headers and
+footers.
+</para>
+<para>Each candidate title is marked in the FO output with a
+<sgmltag>&lt;fo:marker marker-class-name="section.head.marker"&gt;</sgmltag>
+element.
+</para>
+<para>In order for such titles to appear in headers
+or footers, the <literal>header.content</literal>
+or <literal>footer.content</literal> template
+must be customized to retrieve the marker using
+an output element such as:
+</para>
+<programlisting>
+&lt;fo:retrieve-marker retrieve-class-name="section.head.marker"
+                       retrieve-position="first-including-carryover"
+                       retrieve-boundary="page-sequence"/&gt;
+</programlisting>
+
+
+</refsect1>
+</refentry>