<refentry xmlns="http://docbook.org/ns/docbook"
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
          xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
          version="5.0" xml:id="region.inner.extent">
<refmeta>
<refentrytitle>region.inner.extent</refentrytitle>
<refmiscinfo class="other" otherclass="datatype">length</refmiscinfo>
</refmeta>
<refnamediv>
<refname>region.inner.extent</refname>
<refpurpose>Specifies the width of the inner side region</refpurpose>
</refnamediv>

<refsynopsisdiv>
<src:fragment xml:id="region.inner.extent.frag">
<xsl:param name="region.inner.extent">0in</xsl:param>
</src:fragment>
</refsynopsisdiv>

<refsection><info><title>Description</title></info>

<para>The region inner extent is the width of the optional
text area next to the inner side (binding side) of the
body region.  </para>

<para>For double-sided output, this side region 
is <literal>fo:region-start</literal> on a odd-numbered page,
and <literal>fo:region-end</literal> on an even-numbered page.</para>

<para>For single-sided output, this side region
is <literal>fo:region-start</literal> for all pages.</para>

<para>This correspondence applies to all languages,
both left-to-right and right-to-left writing modes.</para>

<para>The default value of this parameter is zero.  If you enlarge this extent,
be sure to also enlarge the <parameter>body.margin.inner</parameter>
parameter to make room for its content, otherwise any text in
the side region may overlap with the body text.</para>

<para>See also
<parameter>region.outer.extent</parameter>,
<parameter>body.margin.inner</parameter>,
<parameter>body.margin.outer</parameter>,
<parameter>side.region.precedence</parameter>.
</para>

</refsection>
</refentry>
