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257 lines
9.5 KiB
XML
257 lines
9.5 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<reference xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="utility">
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<info>
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<title>Common » Utility Template Reference</title>
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<releaseinfo role="meta">
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</releaseinfo>
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</info>
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<partintro xml:id="partintro">
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<title>Introduction</title>
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<para>This is technical reference documentation for the
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miscellaneous utility templates in the DocBook XSL
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Stylesheets.</para>
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<note>
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<para>These templates are defined in a separate file from the set
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of “common” templates because some of the common templates
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reference DocBook XSL stylesheet parameters, requiring the
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entire set of parameters to be imported/included in any
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stylesheet that imports/includes the common templates.</para>
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<para>The utility templates don’t import or include any DocBook
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XSL stylesheet parameters, so the utility templates can be used
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without importing the whole set of parameters.</para>
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</note>
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<para>This is not intended to be user documentation. It is
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provided for developers writing customization layers for the
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stylesheets.</para>
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</partintro>
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<refentry xml:id="template.log.message">
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<refnamediv>
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<refname>log.message</refname>
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<refpurpose>Logs/emits formatted notes and warnings</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis><xsl:template name="log.message">
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<xsl:param name="level"/>
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<xsl:param name="source"/>
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<xsl:param name="context-desc"/>
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<xsl:param name="context-desc-field-length">12</xsl:param>
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<xsl:param name="context-desc-padded">
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<xsl:if test="not($context-desc = '')">
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<xsl:call-template name="pad-string">
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<xsl:with-param name="leftRight">right</xsl:with-param>
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<xsl:with-param name="padVar" select="substring($context-desc, 1, $context-desc-field-length)"/>
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<xsl:with-param name="length" select="$context-desc-field-length"/>
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</xsl:call-template>
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</xsl:if>
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</xsl:param>
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<xsl:param name="message"/>
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<xsl:param name="message-field-length" select="45"/>
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<xsl:param name="message-padded">
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<xsl:variable name="spaces-for-blank-level">
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<!-- * if the level field is blank, we'll need to pad out -->
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<!-- * the message field with spaces to compensate -->
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<xsl:choose>
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<xsl:when test="$level = ''">
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<xsl:value-of select="4 + 2"/>
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<!-- * 4 = hard-coded length of comment text ("Note" or "Warn") -->
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<!-- * + 2 = length of colon-plus-space separator ": " -->
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</xsl:when>
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<xsl:otherwise>
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<xsl:value-of select="0"/>
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</xsl:otherwise>
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</xsl:choose>
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</xsl:variable>
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<xsl:variable name="spaces-for-blank-context-desc">
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<!-- * if the context-description field is blank, we'll need -->
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<!-- * to pad out the message field with spaces to compensate -->
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<xsl:choose>
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<xsl:when test="$context-desc = ''">
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<xsl:value-of select="$context-desc-field-length + 2"/>
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<!-- * + 2 = length of colon-plus-space separator ": " -->
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</xsl:when>
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<xsl:otherwise>
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<xsl:value-of select="0"/>
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</xsl:otherwise>
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</xsl:choose>
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</xsl:variable>
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<xsl:variable name="extra-spaces" select="$spaces-for-blank-level + $spaces-for-blank-context-desc"/>
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<xsl:call-template name="pad-string">
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<xsl:with-param name="leftRight">right</xsl:with-param>
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<xsl:with-param name="padVar" select="substring($message, 1, ($message-field-length + $extra-spaces))"/>
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<xsl:with-param name="length" select="$message-field-length + $extra-spaces"/>
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</xsl:call-template>
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</xsl:param>
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...
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</xsl:template></synopsis>
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</refsynopsisdiv>
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<refsect1><title>Description</title>
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<para>The <function>log.message</function> template is a utility
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template for logging/emitting formatted messages – that is,
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notes and warnings, along with a given log “level” and an
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identifier for the “source” that the message relates to.</para>
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</refsect1><refsect1><title>Parameters</title>
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<variablelist>
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<varlistentry><term>level</term>
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<listitem>
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<para>Text to log/emit in the message-level field to
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indicate the message level
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(<literal>Note</literal> or
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<literal>Warning</literal>)</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>source</term>
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<listitem>
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<para>Text to log/emit in the source field to identify the
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“source” to which the notification/warning relates.
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This can be any arbitrary string, but because the
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message lacks line and column numbers to identify the
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exact part of the source document to which it
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relates, the intention is that the value you pass
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into the <literal>source</literal> parameter should
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give the user some way to identify the portion of
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their source document on which to take potentially
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take action in response to the log message (for
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example, to edit, change, or add content).</para>
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<para>So the <literal>source</literal> value should be,
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for example, an ID, book/chapter/article title, title
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of some formal object, or even a string giving an
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XPath expression.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>context-desc</term>
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<listitem>
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<para>Text to log/emit in the context-description field to
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describe the context for the message.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>context-desc-field-length</term>
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<listitem>
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<para>Specifies length of the context-description field
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(in characters); default is 12</para>
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<para>If the text specified by the
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<literal>context-desc</literal> parameter is longer
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than the number of characters specified in
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<literal>context-desc-field-length</literal>, it is
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truncated to <literal>context-desc-field-length</literal>
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(12 characters by default).</para>
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<para>If the specified text is shorter than
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<literal>context-desc-field-length</literal>,
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it is right-padded out to
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<literal>context-desc-field-length</literal> (12 by
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default).</para>
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<para>If no value has been specified for the
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<literal>context-desc</literal> parameter, the field is
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left empty and the text of the log message begins with
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the value of the <literal>message</literal>
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parameter.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>message</term>
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<listitem>
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<para>Text to log/emit in the actual message field</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>message-field-length</term>
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<listitem>
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<para>Specifies length of the message
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field (in characters); default is 45</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1><refsect1><title>Returns</title>
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<para>Outputs a message (generally, to standard error).</para>
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</refsect1></refentry>
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<refentry xml:id="template.get.doc.title">
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<refnamediv>
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<refname>get.doc.title</refname>
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<refpurpose>Gets a title from the current document</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis><xsl:template name="get.doc.title"/></synopsis>
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</refsynopsisdiv>
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<refsect1><title>Description</title>
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<para>The <function>get.doc.title</function> template is a
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utility template for returning the first title found in the
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current document.</para>
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</refsect1><refsect1><title>Returns</title>
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<para>Returns a string containing some identifying title for the
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current document .</para>
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</refsect1></refentry>
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<refentry xml:id="template.pad-string">
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<refnamediv>
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<refname>pad-string</refname>
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<refpurpose>Right-pads or left-pads a string out to a certain length</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis><xsl:template name="pad-string">
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<xsl:param name="padChar" select="' '"/>
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<xsl:param name="leftRight">left</xsl:param>
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<xsl:param name="padVar"/>
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<xsl:param name="length"/>
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...
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</xsl:template></synopsis>
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</refsynopsisdiv>
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<refsect1><title>Description</title>
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<para>This function takes string <parameter>padVar</parameter> and
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pads it out in the direction <parameter>rightLeft</parameter> to
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the string-length <parameter>length</parameter>, using string
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<parameter>padChar</parameter> (a space character by default) as
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the padding string (note that <parameter>padChar</parameter> can
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be a string; it is not limited to just being a single
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character).</para>
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<note>
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<para>This function began as a copy of Nate Austin's
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<function>prepend-pad</function> function in the <link xlink:href="http://www.dpawson.co.uk/xsl/sect2/padding.html">Padding
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Content</link> section of Dave Pawson's <link xlink:href="http://www.dpawson.co.uk/xsl/index.html">XSLT
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FAQ</link>.</para>
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</note>
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</refsect1><refsect1><title>Returns</title>
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<para>Returns a (padded) string.</para>
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</refsect1></refentry>
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</reference>
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