src/docbkx/xsl/html.xsl

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Licensed to the Apache Software Foundation (ASF) under one
  ~ or more contributor license agreements. See the NOTICE file
  ~ distributed with this work for additional information
  ~ regarding copyright ownership. The ASF licenses this file
  ~ to you under the Apache License, Version 2.0 (the
  ~ "License"); you may not use this file except in compliance
  ~ with the License. You may obtain a copy of the License at
  ~
  ~ http://www.apache.org/licenses/LICENSE-2.0
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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 match="@*|node()" mode="copy-head">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()" mode="copy-head"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template name="user.head.content">
        <xsl:for-each select="document('../../site/site.xml')/project/body/head/*">
            <xsl:copy>
                <xsl:apply-templates select="@*|node()" mode="copy-head"/>
            </xsl:copy>
        </xsl:for-each>
    </xsl:template>
</xsl:stylesheet>