<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="points.per.em"> <refmeta> <refentrytitle>points.per.em</refentrytitle> <refmiscinfo class="other" otherclass="datatype">number</refmiscinfo> </refmeta> <refnamediv> <refname>points.per.em</refname> <refpurpose>Specify the nominal size of an em-space in points</refpurpose> </refnamediv> <refsynopsisdiv> <src:fragment xml:id="points.per.em.frag"> <xsl:param name="points.per.em">10</xsl:param> </src:fragment> </refsynopsisdiv> <refsection><info><title>Description</title></info> <para>The fixed value used for calculations based upon the size of a character. The assumption made is that ten point font is in use. This assumption may not be valid.</para> </refsection> </refentry>