1 <refentry xmlns="http://docbook.org/ns/docbook"
2 xmlns:xlink="http://www.w3.org/1999/xlink"
3 xmlns:xi="http://www.w3.org/2001/XInclude"
4 xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
5 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
6 version="5.0" xml:id="man.charmap.use.subset">
8 <refentrytitle>man.charmap.use.subset</refentrytitle>
9 <refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
12 <refname>man.charmap.use.subset</refname>
13 <refpurpose>Use subset of character map instead of full map?</refpurpose>
17 <src:fragment xml:id="man.charmap.use.subset.frag">
18 <xsl:param name="man.charmap.use.subset" select="1"/>
22 <refsection><info><title>Description</title></info>
24 <para>If the value of the
25 <parameter>man.charmap.use.subset</parameter> parameter is non-zero,
26 a subset of the roff character map is used instead of the full roff
27 character map. The profile of the subset used is determined either
29 <parameter>man.charmap.subset.profile</parameter>
30 parameter (if the source is not in English) or the
31 <parameter>man.charmap.subset.profile.english</parameter>
32 parameter (if the source is in English).</para>
35 <para>You may want to experiment with setting a non-zero value of
36 <parameter>man.charmap.use.subset</parameter>, so that the full
37 character map is used. Depending on which XSLT engine you run,
38 setting a non-zero value for
39 <parameter>man.charmap.use.subset</parameter> may significantly
40 increase the time needed to process your documents. Or it may
41 not. For example, if you set it and run it with xsltproc, it seems
42 to dramatically increase processing time; on the other hand, if you
43 set it and run it with Saxon, it does not seem to increase
44 processing time nearly as much.</para>
46 <para>If processing time is not a important concern and/or you can
47 tolerate the increase in processing time imposed by using the full
48 character map, set <parameter>man.charmap.use.subset</parameter> to
52 <refsection><info><title>Details</title></info>
54 <para>For converting certain Unicode symbols and special characters in
55 UTF-8 or UTF-16 encoded XML source to appropriate groff/roff
56 equivalents in man-page output, the DocBook XSL Stylesheets
57 distribution includes a <link xlink:href="http://docbook.sourceforge.net/snapshot/xsl/manpages/charmap.groff.xsl">roff character map</link> that is compliant with the <link xlink:href="http://www.w3.org/TR/xslt20/#character-maps">XSLT character
58 map</link> format as detailed in the XSLT 2.0 specification. The map
59 contains more than 800 character mappings and can be considered the
60 standard roff character map for the distribution.</para>
63 <para>You can use the <parameter>man.charmap.uri</parameter>
64 parameter to specify a URI for the location for an alternate roff
65 character map to use in place of the standard roff character map
66 provided in the distribution.</para>
69 <para>Because it is not terrifically efficient to use the standard
70 800-character character map in full -- and for most (or all) users,
71 never necessary to use it in full -- the DocBook XSL Stylesheets
72 support a mechanism for using, within any given character map, a
73 subset of character mappings instead of the full set. You can use the
74 <parameter>man.charmap.subset.profile</parameter> or
75 <parameter>man.charmap.subset.profile.english</parameter>
76 parameter to tune the profile of that subset to use.</para>