src/docbkx/xsl/html.xsl

<?xml version="1.0" encoding="utf-8"?>
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  ~ "License"); you may not use this file except in compliance
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                version="1.0">
    <xsl:import href="urn:docbkx:stylesheet"/>

    <xsl:template name="user.head.content">
        <xsl:value-of select="document('../../site/site.xml')/project/body/head/text()" disable-output-escaping="yes"/>
    </xsl:template>
</xsl:stylesheet>