lfs-book/stylesheets/lfs-xsl/docbook-xsl-1.78.1/params/page.width.xml

<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="page.width">
<refmeta>
<refentrytitle>page.width</refentrytitle>
<refmiscinfo class="other" otherclass="datatype">length</refmiscinfo>
</refmeta>
<refnamediv>
<refname>page.width</refname>
<refpurpose>The width of the physical page</refpurpose>
</refnamediv>

<refsynopsisdiv>
<src:fragment xml:id="page.width.frag"><xsl:param name="page.width">
  <xsl:choose>
    <xsl:when test="$page.orientation = 'portrait'">
      <xsl:value-of select="$page.width.portrait"/>
    </xsl:when>
    <xsl:otherwise>
      <xsl:value-of select="$page.height.portrait"/>
    </xsl:otherwise>
  </xsl:choose>
</xsl:param></src:fragment>
</refsynopsisdiv>

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

<para>The page width is generally calculated from the
<parameter>paper.type</parameter> and 
<parameter>page.orientation</parameter> parameters.</para>

</refsection>
</refentry>