Replacing tabs characters in DITA codeblocks with spaces for PDF (FOP support)

ReplaceTabs.xslt

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:fo="http://www.w3.org/1999/XSL/Format"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"
	version="2.0"
	exclude-result-prefixes="xs">
	<xsl:template match="*[contains(@class,' pr-d/codeblock ')]">
		<xsl:call-template name="generateAttrLabel"/>
		<fo:block xsl:use-attribute-sets="codeblock">
			<xsl:call-template name="commonattributes"/>
			<xsl:call-template name="setFrame"/>
			<xsl:call-template name="setScale"/>
			<xsl:variable name="codeblock.line-number" as="xs:boolean">
				<xsl:apply-templates select="." mode="codeblock.generate-line-number"/>
			</xsl:variable>
			<xsl:choose>
				<xsl:when test="$codeblock.wrap or $codeblock.line-number">
					<xsl:variable name="content" as="node()*">
						<xsl:call-template name="codetext"/>
					</xsl:variable>
					<xsl:choose>
						<xsl:when test="$codeblock.line-number">
							<xsl:variable name="buf" as="document-node()">
								<xsl:document>
									<xsl:processing-instruction name="line-number"/>
									<xsl:apply-templates select="$content" mode="codeblock.line-number"/>
								</xsl:document>
							</xsl:variable>
							<xsl:variable name="line-count" select="count($buf/descendant::processing-instruction('line-number'))"/>
							<xsl:apply-templates select="$buf" mode="codeblock">
								<xsl:with-param name="line-count" select="$line-count" tunnel="yes"/>
							</xsl:apply-templates>    
						</xsl:when>
						<xsl:otherwise>
							<xsl:message>Otherwise...</xsl:message>
							<xsl:apply-templates select="$content" mode="codeblock"/>
						</xsl:otherwise>
					</xsl:choose>                
				</xsl:when>
				<xsl:otherwise>
					<xsl:call-template name="codetext"/>
				</xsl:otherwise>
			</xsl:choose>
		</fo:block>
	</xsl:template>
	
	<xsl:template match="*[contains(@class,' pr-d/codeblock ')]/text()" name="codetext">
		<xsl:value-of select="replace(.,'&#009;','       ')"/>
	</xsl:template>
</xsl:stylesheet>