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<?xml version="1.0"?>
<reference xml:id="charmap">
<info>
<title>Common » Character-Map Template Reference</title>
<releaseinfo role="meta">
$Id: charmap.xsl 7266 2007-08-22 11:58:42Z xmldoc $
</releaseinfo>
</info>
<partintro xml:id="partintro">
<title>Introduction</title>
<para>This is technical reference documentation for the
character-map templates in the DocBook XSL Stylesheets.</para>
<note>
<para>These templates are defined in a separate file from the set
of “common” templates because some of the common templates
reference DocBook XSL stylesheet parameters, requiring the
entire set of parameters to be imported/included in any
stylesheet that imports/includes the common templates.</para>
<para>The character-map templates don’t import or include
any DocBook XSL stylesheet parameters, so the
character-map templates can be used without importing the
whole set of parameters.</para>
</note>
<para>This is not intended to be user documentation. It is
provided for developers writing customization layers for the
stylesheets.</para>
</partintro>
<refentry xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="template.apply-character-map">
<refnamediv>
<refname>apply-character-map</refname>
<refpurpose>Applies an XSLT character map</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis><xsl:template name="apply-character-map">
<xsl:param name="content"/>
<xsl:param name="map.contents"/>
...
</xsl:template></synopsis>
</refsynopsisdiv>
<refsect1><title>Description</title>
<para>This template applies an <link xlink:href="http://www.w3.org/TR/xslt20/#character-maps">XSLT character map</link>; that is, it causes certain
individual characters to be substituted with strings of one
or more characters. It is useful mainly for replacing
multiple “special” characters or symbols in the same target
content. It uses the value of
<parameter>map.contents</parameter> to do substitution on
<parameter>content</parameter>, and then returns the
modified contents.</para>
<note>
<para>This template is a very slightly modified version of
Jeni Tennison’s <function>replace_strings</function>
template in the <link xlink:href="http://www.dpawson.co.uk/xsl/sect2/StringReplace.html#d9351e13">multiple string replacements</link> section of Dave Pawson’s
<link xlink:href="http://www.dpawson.co.uk/xsl/index.html">XSLT FAQ</link>.</para>
<para>The <function>apply-string-subst-map</function>
template is essentially the same template as the
<function>apply-character-map</function> template; the
only difference is that in the map that
<function>apply-string-subst-map</function> expects, <tag class="attribute">oldstring</tag> and <tag class="attribute">newstring</tag> attributes are used
instead of <tag class="attribute">character</tag> and <tag class="attribute">string</tag> attributes.</para>
</note>
</refsect1><refsect1><title>Parameters</title>
<variablelist>
<varlistentry><term>content</term>
<listitem>
<para>The content on which to perform the character-map
substitution.</para>
</listitem>
</varlistentry>
<varlistentry><term>map.contents</term>
<listitem>
<para>A node set of elements, with each element having
the following attributes:
<itemizedlist>
<listitem>
<simpara><tag class="attribute">character</tag>, a
character to be replaced</simpara>
</listitem>
<listitem>
<simpara><tag class="attribute">string</tag>, a
string with which to replace <tag class="attribute">character</tag></simpara>
</listitem>
</itemizedlist>
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1></refentry>
<refentry xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="template.read-character-map">
<refnamediv>
<refname>read-character-map</refname>
<refpurpose>Reads in all or part of an XSLT character map</refpurpose>
</refnamediv>
<refsynopsisdiv>
<synopsis><xsl:template name="read-character-map">
<xsl:param name="use.subset"/>
<xsl:param name="subset.profile"/>
<xsl:param name="uri"/>
...
</xsl:template></synopsis>
</refsynopsisdiv>
<refsect1><title>Description</title>
<para>The XSLT 2.0 specification describes <link xlink:href="http://www.w3.org/TR/xslt20/#character-maps">character maps</link> and explains how they may be used
to allow a specific character appearing in a text or
attribute node in a final result tree to be substituted by
a specified string of characters during serialization. The
<function>read-character-map</function> template provides a
means for reading and using character maps with XSLT
1.0-based tools.</para>
<para>This template reads the character-map contents from
<parameter>uri</parameter> (in full or in part, depending on
the value of the <parameter>use.subset</parameter>
parameter), then passes those contents to the
<function>apply-character-map</function> template, along with
<parameter>content</parameter>, the data on which to perform
the character substitution.</para>
<para>Using the character map “in part” means that it uses only
those <tag>output-character</tag> elements that match the
XPath expression given in the value of the
<parameter>subset.profile</parameter> parameter. The current
implementation of that capability here relies on the
<function>evaluate</function> extension XSLT function.</para>
</refsect1><refsect1><title>Parameters</title>
<variablelist>
<varlistentry><term>use.subset</term>
<listitem>
<para>Specifies whether to use a subset of the character
map instead of the whole map; boolean
<literal>0</literal> or <literal>1</literal></para>
</listitem>
</varlistentry>
<varlistentry><term>subset.profile</term>
<listitem>
<para>XPath expression that specifies what subset of the
character map to use</para>
</listitem>
</varlistentry>
<varlistentry><term>uri</term>
<listitem>
<para>URI for a character map</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1></refentry>
</reference>
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