/usr/share/boostbook/xsl/relative-href.xsl is in libboost1.55-tools-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
Copyright (c) 2002 Douglas Gregor <doug.gregor -at- gmail.com>
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
-->
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:import href="http://docbook.sourceforge.net/release/xsl/current/lib/lib.xsl"/>
<!-- ==================================================================== -->
<!-- Check if path is absolute
Not attempting to fully parse or validate absolute vs. relative URI.
Assumes an absolute url when $target matches the regex '^[a-zA-Z.+-]*:'
According to RFC1808, however, the colon (':') may also appear in a relative
URL. To workaround this limitation for relative links containing colons one
may use the alternatives below, instead.
For the relative URI this:that use ./this:that or this%3Athat, instead.
-->
<xsl:template name="is.absolute.uri">
<xsl:param name="uri"/>
<xsl:variable name="scheme1" select="substring-before($uri, ':')"/>
<xsl:variable name="scheme2" select="translate($scheme1, 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+-.', '')"/>
<xsl:choose>
<xsl:when test="$scheme1 and not($scheme2)">1</xsl:when>
<xsl:otherwise>0</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="href.target.relative">
<xsl:param name="target"/>
<xsl:param name="context" select="."/>
<xsl:variable name="isabsoluteuri">
<xsl:call-template name="is.absolute.uri">
<xsl:with-param name="uri" select="$target"/>
</xsl:call-template>
</xsl:variable>
<xsl:choose>
<xsl:when test="$isabsoluteuri='1'">
<xsl:value-of select="$target"/>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="href.to.uri" select="$target"/>
<xsl:variable name="href.from.uri">
<xsl:call-template name="href.target.uri">
<xsl:with-param name="object" select="$context"/>
</xsl:call-template>
</xsl:variable>
<xsl:variable name="href.to">
<xsl:call-template name="trim.common.uri.paths">
<xsl:with-param name="uriA" select="$href.to.uri"/>
<xsl:with-param name="uriB" select="$href.from.uri"/>
<xsl:with-param name="return" select="'A'"/>
</xsl:call-template>
</xsl:variable>
<xsl:variable name="href.from">
<xsl:call-template name="trim.common.uri.paths">
<xsl:with-param name="uriA" select="$href.to.uri"/>
<xsl:with-param name="uriB" select="$href.from.uri"/>
<xsl:with-param name="return" select="'B'"/>
</xsl:call-template>
</xsl:variable>
<xsl:variable name="depth">
<xsl:call-template name="count.uri.path.depth">
<xsl:with-param name="filename" select="$href.from"/>
</xsl:call-template>
</xsl:variable>
<xsl:variable name="href">
<xsl:call-template name="copy-string">
<xsl:with-param name="string" select="'../'"/>
<xsl:with-param name="count" select="$depth"/>
</xsl:call-template>
<xsl:value-of select="$href.to"/>
</xsl:variable>
<xsl:value-of select="$href"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
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