common/sysdefdowngrade/joinsysdef-module.xsl
author andy simpson <andrews@symbian.org>
Wed, 20 Jan 2010 15:03:03 +0000
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add xsl for merging / downgrading system model
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<?xml version="1.0"?>
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 <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
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 	xmlns:exslt="http://exslt.org/common" exclude-result-prefixes="exslt">
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	<!-- save SF namespace as a constant to avoid the risk of typos-->
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 <xsl:variable name="defaultns">http://www.symbian.org/system-definition</xsl:variable>
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<!-- create a stand-alone sysdef from a linked set of fragments -->
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<xsl:template match="/*" mode="join">
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	<xsl:message terminate="yes">Cannot process this document</xsl:message>
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</xsl:template>
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<xsl:template match="/SystemDefinition[@schema='3.0.0' and count(*)=1]" mode="join">
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	<xsl:param name="origin" select="/.."/>
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	<xsl:param name="root"/>
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	<xsl:param name="filename"/>
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	<xsl:param name="namespaces"/>
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	<xsl:param name="data" select="/.."/>
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	<xsl:choose>
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		<xsl:when test="$origin">	<!-- this sysdef fragment was linked from a parent sysdef -->
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			<xsl:for-each select="*"> <!-- can be only one -->
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				<xsl:variable name="upid"><xsl:apply-templates select="$origin/@id" mode="my-id"/></xsl:variable>		<!-- namespaceless ID of this in parent doc -->
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				<xsl:variable name="id"><xsl:apply-templates select="@id" mode="my-id"/></xsl:variable>						<!-- namespaceless ID of this here -->
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				<xsl:variable name="upns"><xsl:apply-templates select="$origin/@id" mode="my-namespace"/></xsl:variable>	<!-- ID's namespace in parent doc -->
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				<xsl:variable name="ns"><xsl:apply-templates select="@id" mode="my-namespace"/></xsl:variable>	<!-- ID's namespace -->
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				<xsl:if test="$id!=$upid or $ns!=$upns">
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					<xsl:message terminate="yes">Linked ID "<xsl:value-of select="$id"/>" (<xsl:value-of select="$ns"/>) must match linking document "<xsl:value-of select="$upid"/>" (<xsl:value-of select="$upns"/>)</xsl:message>
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				</xsl:if>
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				<!-- copy any attributes not already defined (parent doc overrides child doc)-->
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				<xsl:for-each select="@*">
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					<xsl:variable name="n" select="name()"/>
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					<xsl:choose>
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						<xsl:when test="$n='id'"/> <!-- never copy this, always set -->
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						<xsl:when test="$origin/@*[name()=$n]"> <!-- don't copy if already set -->
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							<xsl:message>Cannot set "<xsl:value-of select="$n"/>", already set</xsl:message>
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						</xsl:when>
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						<xsl:when test="$n='before'">
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							<!-- ensure ns is correct (if any future attribtues will ever use an ID, process it here too)-->
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							<xsl:apply-templates select="." mode="join">
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								<xsl:with-param name="namespaces" select="$namespaces"/>
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							</xsl:apply-templates>
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						</xsl:when> 
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						<xsl:otherwise><xsl:copy-of select="."/></xsl:otherwise> <!-- just copy anything else -->
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					</xsl:choose>
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				</xsl:for-each>
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				<xsl:copy-of select="../namespace::*[not(.=$namespaces)]"/> <!-- set any namespaces not already set (they should all alreayd be, but some XSLT processors are quirky) -->
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			 	<xsl:apply-templates select="$data" mode="overlay-attributes">
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					<xsl:with-param name="item" select="current()"/>
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				</xsl:apply-templates>
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				<xsl:variable name="content">									
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					<xsl:apply-templates select="*|comment()" mode="join">
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						<xsl:with-param name="root" select="$root"/>
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						<xsl:with-param name="filename" select="$filename"/>
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						<xsl:with-param name="data" select="$data"/>
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						<xsl:with-param name="namespaces" select="$namespaces | ../namespace::*[not(.=$namespaces)]"/>
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					</xsl:apply-templates>
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				</xsl:variable>
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				<xsl:apply-templates select="." mode="is-content-filtered"> <!-- optionally add filtered="yes" if some content has been removed -->
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					<xsl:with-param name="content" select="$content"/>
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				</xsl:apply-templates>
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			 	<xsl:apply-templates select="$data" mode="overlay-meta">
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					<xsl:with-param name="item" select="current()"/>
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				</xsl:apply-templates>
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				<xsl:copy-of select="$content"/>
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			</xsl:for-each>
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		</xsl:when>
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		<xsl:when test="function-available('exslt:node-set')"> <!-- this is the root element of a root sysdef -->
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			<!--try to put all namespaces in root element -->
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			<xsl:variable name="nss">
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				<!-- contains node set of namespaces to add to root element.
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					May panic if there are too many single-letter namespaces and this can't create a new one -->
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				<xsl:call-template name="needed-namespaces">
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					<xsl:with-param name="foundns">
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						<xsl:apply-templates select="//*[(self::component or self::collection or self::package or self::layer) and @href]" mode="scan-for-namespaces"/>
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					</xsl:with-param>
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				</xsl:call-template>
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			</xsl:variable>
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			<xsl:variable name="ns" select="@id-namespace | namespace::* | exslt:node-set($nss)/*"/>
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			<xsl:copy><xsl:copy-of select="@*"/>
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				<xsl:apply-templates select="self::*[not(@id-namespace)]" mode="add-id-ns"/>
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				<xsl:for-each select="exslt:node-set($nss)/*"> <!-- add namespace definitions -->
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					<xsl:attribute name="xmlns:{name()}">
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						<xsl:value-of select="."/>
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					</xsl:attribute>
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				</xsl:for-each>
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				<!-- no need to call is-content-filtered, it never will be from this element --> 
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				<xsl:apply-templates select="*|comment()" mode="join">
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					<xsl:with-param name="namespaces" select="$ns"/>
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					<xsl:with-param name="root" select="$root"/>
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					<xsl:with-param name="data" select="$data"/>
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					<xsl:with-param name="filename" select="$filename"/>
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				</xsl:apply-templates>
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			</xsl:copy>
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		</xsl:when>
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		<xsl:otherwise> <!-- can't handle node-set() so put the namespaces in the document instead of the root element-->
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			<xsl:variable name="ns" select="@id-namespace | namespace::*"/>
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			<xsl:copy><xsl:copy-of select="@*"/>
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				<!-- no need to call is-content-filtered, it never will be from this element -->
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				<xsl:apply-templates select="*|comment()" mode="join">
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					<xsl:with-param name="namespaces" select="$ns"/>
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					<xsl:with-param name="root" select="$root"/>
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					<xsl:with-param name="data" select="$data"/>
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					<xsl:with-param name="filename" select="$filename"/>
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				</xsl:apply-templates>
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			</xsl:copy>
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		</xsl:otherwise>
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	</xsl:choose>
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</xsl:template>
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<xsl:template match="*" mode="scan-for-namespaces"/> <!-- just in case of errors, consider replacing by terminate -->
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<xsl:template match="*[@href and not(self::meta)]" mode="scan-for-namespaces">
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	<!-- produce a list of namespace-prefix namespace pairs separated by newlines, in reverse order found in documents 
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		reverse order so we can try to use the first namespace prefix defined if it's available-->
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	<xsl:for-each select="document(@href,.)/*">
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		<xsl:apply-templates select="//*[(self::component or self::collection or self::package or self::layer) and @href]" mode="scan-for-namespaces"/>
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		<xsl:for-each select="//namespace::* | @id-namespace">
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			<xsl:value-of select="concat(name(),' ',.,'&#xa;')"/>
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		</xsl:for-each>
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	</xsl:for-each>			
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</xsl:template>
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<xsl:template name="needed-namespaces">
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	<xsl:param name="foundns"/>
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	<xsl:param name="usedpre"/>
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	<xsl:if test="foundns!=''">
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		<xsl:variable name="line" select="substring-before($foundns,'&#xa;')"/> <!-- always has trailing newline -->
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		<xsl:variable name="name" select="substring-after($line,' ')"/> <!-- namespace prefix -->
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		<xsl:variable name="remainder" select="substring-after($foundns,'&#xa;')"/>
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		<xsl:variable name="newprefix">
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			<xsl:if test="not(contains(concat('&#xa;',$remainder),concat('&#xa;',$line,'&#xa;'))) and
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				not(//namespace::*[.=$name] or @id-namespace[.=$name] or (not(@id-namespace) and $defaultns=$name))">
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						<xsl:apply-templates select="." mode="ns-prefix">
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							<xsl:with-param name="ns" select="$name"/>
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							<xsl:with-param name="pre" select="substring-before($line,' ')"/>
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							<xsl:with-param name="dontuse" select="$usedpre"/>
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						</xsl:apply-templates>
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			</xsl:if>
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		</xsl:variable>
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		<xsl:if test="$newprefix!=''">
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			<!-- can treat this as if it were a namespace node -->
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			<xsl:element name="{$newprefix}">
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				<xsl:value-of select="$name"/>
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			</xsl:element>
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		</xsl:if>
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		<xsl:if test="$remainder!=''">
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			<xsl:call-template name="needed-namespaces">
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				<xsl:with-param name="foundns" select="$remainder"/>
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				<xsl:with-param name="usedpre" select="concat($usedpre,' ',$newprefix,' ')"/>
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			</xsl:call-template>
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		</xsl:if>
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	</xsl:if>
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</xsl:template>
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<xsl:template match="/SystemDefinition" mode="ns-prefix">
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	<!-- should be able to replace this with mechanism that uses the XSLT processor's own ability to generate namespaces -->
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	<xsl:param name="ns"/>
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	<xsl:param name="pre"/>
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	<xsl:param name="dontuse"/>
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	<xsl:param name="chars">ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz</xsl:param>
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	<xsl:variable name="name" select="substring(substring-after($ns,'http://www.'),1,1)"/>
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	<xsl:choose>
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		<xsl:when test="$pre!='' and $pre!='id-namespace' and not(//namespace::*[name()=$pre]) and not(contains($dontuse,concat(' ',$pre,' ')))">
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			<xsl:value-of select="$pre"/>
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		</xsl:when>
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		<xsl:when test="$ns='' and $chars=''">
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			<xsl:message terminate="yes">Cannot create namespace prefix for downstream default namespace</xsl:message>
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		</xsl:when>
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		<xsl:when test="$name!='' and not(contains($dontuse,concat(' ',$name,' ')))"><xsl:value-of select="$name"/></xsl:when>
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		<xsl:when test="namespace::*[name()=substring($chars,1,1)] or contains($dontuse,concat(' ',substring($chars,1,1),' '))">
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			<xsl:apply-templates mode="ns-prefix">
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				<xsl:with-param name="chars" select="substring($chars,2)"/>
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			</xsl:apply-templates>
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		</xsl:when>
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		<xsl:otherwise>
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			<xsl:value-of select="substring($chars,1,1)"/>
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		</xsl:otherwise>
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	</xsl:choose>
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</xsl:template>
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<xsl:template match="unit" mode="join">	<xsl:param name="root"/><xsl:param name="filename"/><xsl:param name="data"/>
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	 <xsl:variable name="display">
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	 	<xsl:apply-templates select="$data" mode="filter">
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			<xsl:with-param name="item" select="current()"/>
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		</xsl:apply-templates>
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	 </xsl:variable>
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	 <xsl:if test="$display != 'hide' "> <!-- if hide, remove completely from the output-->	 
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		<xsl:element name="{name()}">
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			<xsl:apply-templates select="@*" mode="join">
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				<xsl:with-param name="root" select="$root"/>
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				<xsl:with-param name="filename" select="$filename"/>
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			</xsl:apply-templates>
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		</xsl:element>
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	</xsl:if>
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</xsl:template>
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<!-- override mode="meta" to translate metadata sections. By default, include -->
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<xsl:template match="meta" priority="2"><xsl:param name="data"/>
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	 <xsl:variable name="display">
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	 	<xsl:apply-templates select="$data" mode="filter">
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			<xsl:with-param name="item" select="current()"/>
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		</xsl:apply-templates>
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	 </xsl:variable>
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	<xsl:if test="$display != 'hide' "> <!-- if hide, remove completely from the output-->	
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		<xsl:apply-templates select="." mode="meta"> 
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			<xsl:with-param name="display" select="$display"/>
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			<xsl:with-param name="data" select="$data"/>
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		</xsl:apply-templates>
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	</xsl:if>
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</xsl:template>
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<xsl:template match="*" mode="join">
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	<xsl:param name="root"/><xsl:param name="filename"/><xsl:param name="namespaces"/><xsl:param name="data"/>
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	<!-- get attribtues from overlay -->
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	<!-- test for presence, if filtered out, just return -->
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	<!-- test for children, if it has some, but they're filtered out, either return or leave as empty, dependening on filter rule
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		if had items and now has none, options:
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			still has meta: keep / delete
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			still has comments: keep / delete 
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	 -->
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	 <xsl:variable name="display">
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	 	<xsl:apply-templates select="$data" mode="filter">
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			<xsl:with-param name="item" select="current()"/>
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		</xsl:apply-templates>
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	 </xsl:variable>
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	 <xsl:if test="$display != 'hide' "> <!-- if hide, remove completely from the output-->
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		 <xsl:variable name="href">
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		 	<xsl:apply-templates select="." mode="link">
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				<xsl:with-param name="data" select="$data"/>
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			</xsl:apply-templates>
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		 </xsl:variable>
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		<xsl:element name="{name()}"> <!-- use this instead of <copy> so xalan doesn't add extra wrong namespaces -->
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			<xsl:apply-templates select="@*" mode="join">
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				<xsl:with-param name="namespaces" select="$namespaces"/>
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			</xsl:apply-templates>
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			<xsl:if test="$display != '' ">
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				<!-- custom attribute to indicate how this is to be represented. Blank indicates normal, hide removes from the output (see above), anything else is put in the attribute --> 
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				<xsl:attribute name="display"><xsl:value-of select="$display"/></xsl:attribute>
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			</xsl:if>
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		 	<xsl:apply-templates select="$data" mode="overlay-attributes">
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				<xsl:with-param name="item" select="current()"/>
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			</xsl:apply-templates>			
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			<xsl:choose>
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				<xsl:when test="$href !='' ">
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					<xsl:variable name="origin" select="."/>
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					<xsl:apply-templates select="document($href,.)/*" mode="join">
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						<xsl:with-param name="origin" select="$origin"/>
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						<xsl:with-param name="data" select="$data"/>
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						<xsl:with-param name="namespaces" select="$namespaces"/>
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						<xsl:with-param name="filename">
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							<xsl:call-template name="joinpath">
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								<xsl:with-param name="file" select="$filename"/>
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								<xsl:with-param name="rel" select="$href"/>
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							</xsl:call-template>					
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						</xsl:with-param>
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						<xsl:with-param name="root">
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								<xsl:value-of select="$root"/>/<xsl:call-template name="lastbefore">
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								<xsl:with-param name="string" select="$href"/>
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							</xsl:call-template>
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						</xsl:with-param>
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					</xsl:apply-templates> 
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				</xsl:when>
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				<xsl:otherwise>
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					<xsl:variable name="content">
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						<xsl:apply-templates select="*|comment()" mode="join">
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							<xsl:with-param name="root" select="$root"/>
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							<xsl:with-param name="filename" select="$filename"/>
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							<xsl:with-param name="namespaces" select="$namespaces"/>
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							<xsl:with-param name="data" select="$data"/>
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						</xsl:apply-templates>
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					</xsl:variable>
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					<xsl:apply-templates select="." mode="is-content-filtered"> <!-- add filtered="yes" if some content has been removed -->
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						<xsl:with-param name="content" select="$content"/>
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					</xsl:apply-templates>
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				 	<xsl:apply-templates select="$data" mode="overlay-meta">
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						<xsl:with-param name="item" select="current()"/>
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					</xsl:apply-templates>
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					<xsl:copy-of select="$content"/>
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				</xsl:otherwise>
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			</xsl:choose>
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		</xsl:element>
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	</xsl:if>
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</xsl:template>
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<!-- By default, do nothing. Can override template to add filtered="yes" if need to track what's a placeholder and what's been filtered 
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	implement with param name="content"
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-->
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<xsl:template mode="is-content-filtered" match="*" priority="-2"/>
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<xsl:template match="@mrp[starts-with(.,'/')] | @bldFile[starts-with(.,'/')] | @base[starts-with(.,'/')]" mode="join">
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	<xsl:copy-of select="."/>
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</xsl:template>
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<xsl:template match="@mrp|@bldFile|@base" mode="join">	<xsl:param name="root"/><xsl:param name="filename"/>
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	<xsl:attribute name="{name()}">
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		<xsl:call-template name="joinpath">
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			<xsl:with-param name="file" select="$filename"/>
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			<xsl:with-param name="rel" select="."/>
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		</xsl:call-template>	
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	</xsl:attribute>	
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</xsl:template>
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<xsl:template match="@href" mode="join"/> <!--never copy this into the generated doc, that's the whole point of this module -->
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<xsl:template match="@*" mode="my-namespace"> <!-- the namespace of an ID -->
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	<xsl:choose>
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		<xsl:when test="contains(.,':')">
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			<xsl:value-of select="ancestor::*/namespace::*[name()=substring-before(current(),':')]"/>
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		</xsl:when>
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		<xsl:when test="/SystemDefinition/@id-namespace">
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			<xsl:value-of select="/SystemDefinition/@id-namespace"/>
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		</xsl:when>
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		<xsl:otherwise>
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			<xsl:value-of select="$defaultns"/>
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		</xsl:otherwise>
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	</xsl:choose>
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</xsl:template>
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<xsl:template match="@*" mode="my-id"> <!-- the ID with namespace prefix removed -->
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	<xsl:choose>
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		<xsl:when test="contains(.,':')">
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			<xsl:value-of select="substring-after(.,':')"/>
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		</xsl:when>
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		<xsl:otherwise>
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			<xsl:value-of select="."/>
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		</xsl:otherwise>
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	</xsl:choose>
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</xsl:template>
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<xsl:template match="@id|@before" mode="join">
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	<xsl:param name="namespaces"/>
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	<!-- this will change the namespace prefixes for all IDs to match the root document -->
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	<xsl:variable name="ns">
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		<xsl:apply-templates select="." mode="my-namespace"/>
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	</xsl:variable>
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	<xsl:if test="$ns=''">
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		<xsl:message terminate="yes">Could not find namespace for <xsl:value-of select="."/>
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		</xsl:message>
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	</xsl:if>
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	<xsl:variable name="prefix" select="name($namespaces[.=$ns])"/>
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	<xsl:attribute name="{name()}">
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	<xsl:choose>
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		<xsl:when test="$prefix = 'id-namespace' or  (not($namespaces[name()='id-prefix']) and $ns=$defaultns)"/> <!-- it's the default namespace, no prefix -->
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		<xsl:when test="$prefix='' and contains(.,':')">
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			<!-- complex: copy id and copy namespace (namespace should be copied already)-->
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			<xsl:value-of select="."/>
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		</xsl:when>
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		<xsl:when test="$prefix='' and $ns=$defaultns"/> <!-- no prefix and it's the default --> 
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		<xsl:when test="$prefix!=''">			<!-- just change the prefix -->
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			<xsl:value-of select="concat($prefix,':')"/>
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		</xsl:when>
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		<xsl:otherwise>
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		<xsl:message terminate="yes">Error</xsl:message>
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		</xsl:otherwise>
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	</xsl:choose>
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		<xsl:apply-templates select="." mode="my-id"/>
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	</xsl:attribute>
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</xsl:template>
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<xsl:template match="@*|comment()" mode="join"><xsl:copy-of select="."/></xsl:template>
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<!-- path handling follows -->
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 <xsl:template name="lastbefore"><xsl:param name="string"/><xsl:param name="substr" select="'/'"/>
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        <xsl:if test="contains($string,$substr)">
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                <xsl:value-of select="substring-before($string,$substr)"/>
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                <xsl:if test="contains(substring-after($string,$substr),$substr)">
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	                <xsl:value-of select="$substr"/>
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	              </xsl:if>
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        <xsl:call-template name="lastbefore">
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                <xsl:with-param name="string" select="substring-after($string,$substr)"/>
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                <xsl:with-param name="substr" select="$substr"/>
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        </xsl:call-template>
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        </xsl:if>
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</xsl:template>
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 <xsl:template name="joinpath"><xsl:param name="file"/><xsl:param name="rel"/>
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        <xsl:call-template name="reducepath">
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        <xsl:with-param name="file">
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	        <xsl:call-template name="lastbefore">
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	                <xsl:with-param name="string" select="$file"/>
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	        </xsl:call-template>
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	        <xsl:text>/</xsl:text>
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	        <xsl:value-of select="$rel"/>
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	       </xsl:with-param>
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	      </xsl:call-template>
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 </xsl:template>
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<xsl:template name="reducepath"><xsl:param name="file"/>
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	<xsl:call-template name="reducedotdotpath">
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    	<xsl:with-param name="file">
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			<xsl:call-template name="reducedotpath">
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		    	<xsl:with-param name="file" select="$file"/>
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		    </xsl:call-template>
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		</xsl:with-param>
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	</xsl:call-template>
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</xsl:template>
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<xsl:template name="reducedotdotpath"><xsl:param name="file"/>
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	<xsl:choose>
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		<xsl:when test="starts-with($file,'../')">
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			<xsl:text>../</xsl:text>
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			<xsl:call-template name="reducedotdotpath">
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        		<xsl:with-param name="file" select="substring($file,4)"/>
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			</xsl:call-template>
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		</xsl:when>
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		<xsl:when test="contains($file,'/../')">							
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			<xsl:call-template name="reducepath">
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        		<xsl:with-param name="file">
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			        <xsl:call-template name="lastbefore">
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			                <xsl:with-param name="string" select="substring-before($file,'/../')"/>
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			        </xsl:call-template>
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			        <xsl:text>/</xsl:text>
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					<xsl:value-of select="substring-after($file,'/../')"/>
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				</xsl:with-param>
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			</xsl:call-template>
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		</xsl:when>
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		<xsl:otherwise><xsl:value-of select="$file"/></xsl:otherwise>
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	</xsl:choose>
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 </xsl:template>
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<xsl:template name="reducedotpath"><xsl:param name="file"/>
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	<xsl:choose>	
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		<xsl:when test="starts-with($file,'./')">
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			<xsl:call-template name="reducedotpath">
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        		<xsl:with-param name="file" select="substring($file,3)"/>
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			</xsl:call-template>
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		</xsl:when>
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		<xsl:when test="contains($file,'/./')">
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			<xsl:call-template name="reducepath">
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        		<xsl:with-param name="file">
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	                <xsl:value-of select="substring-before($file,'/./')"/>
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			        <xsl:text>/</xsl:text>
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					<xsl:value-of select="substring-after($file,'/./')"/>
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				</xsl:with-param>
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			</xsl:call-template>
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		</xsl:when>
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		<xsl:otherwise><xsl:value-of select="$file"/></xsl:otherwise>
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	</xsl:choose>
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 </xsl:template>
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<!-- overridable templates follow -->
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<xsl:template match="*" mode="filter" priority="-9"/> <!-- by default show --> 
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<xsl:template match="*" mode="overlay-attributes" priority="-9"/> <!-- by default do nothing --> 
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<xsl:template match="*" mode="overlay-meta" priority="-9"/> <!-- by default do nothing --> 
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<xsl:template match="/SystemDefinition" mode="add-id-ns" priority="-9"/> <!-- some tools may have an easier job if this were always present, but, by default, assume it can just stay implied -->
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<xsl:template match="*" mode="link" priority="-1"> <!-- can be overriden to allow custom changes to href values --> 
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<xsl:value-of select="@href"/>
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</xsl:template>
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<xsl:template match="*" mode="meta" priority="-9"><xsl:param name="data"/><xsl:param name="display"/>
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	<xsl:element name="{name()}">
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		<xsl:copy-of select="@*[name()!='href']"/> <!-- copy all attributes as is, always drop href -->
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		<xsl:choose>
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			<xsl:when test="$display='local' and @href and contains(@href,':') and not(starts-with(@href,'file:'))">
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				<!-- non-local URL: only want local URLs, so keep href as is-->
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				<xsl:copy-of select="@href"/> 
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			</xsl:when>
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			<xsl:when test="@href">
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				<xsl:copy-of select="document(@href,.)/*"/> 
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			</xsl:when>
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   482
			<xsl:otherwise>
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				<xsl:copy-of select="*|comment()"/>
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			</xsl:otherwise>
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		</xsl:choose>
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	</xsl:element>
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</xsl:template>
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</xsl:stylesheet>