For one there is cross-ref and for another there is no. In these cases
also it should do the grouping.
<xsl:function name="f:country" as="xs:string">
<xsl:param name="a" as="element()"/>
<xsl:choose>
<xsl:when test="$a/cross-ref">
<xsl:sequence select="key('country',
$a/cross-ref/@refid,root($a))/tokenize(.,',\s+')[last()]"/>
</xsl:when>
<xsl:otherwise>
<xsl:sequence
select="$a/following-sibling::affiliation[1]/tokenize(.,',\s+')[last()]"/>
</xsl:otherwise>
</xsl:choose>
</xsl:function>
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