Just to follow up, with some help off-list from Geert, this gets me
what I was looking for:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="2.0"
xmlns:mods="http://www.loc.gov/mods/v3";
xmlns:db="http://docbook.org/docbook-ng";
exclude-result-prefixes="db mods">
<xsl:output method="xhtml" encoding="UTF-8" indent="yes"/>
<xsl:variable name="bibkey" select="//db:biblioref/@linkend" />
<xsl:template match="/">
<html xmlns="http://www.w3.org/1999/xhtml";>
<head>
<title>Testing</title>
</head>
<body>
<h3>Citations</h3>
<xsl:for-each select="distinct-values($bibkey)">
<ol>
<li><xsl:value-of select="." /></li>
</ol>
</xsl:for-each>
<h3>Titles</h3>
<xsl:for-each select="distinct-values($bibkey)">
<xsl:variable name="bibrecord"
select="doc(concat('bib-data/', .,
'.mods'))/mods:modsCollection/mods:mods" />
<ol>
<li><xsl:value-of
select="$bibrecord/mods:titleInfo/mods:title" /></li>
</ol>
</xsl:for-each>
</body>
</html>
</xsl:template>
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