<xsl:function name="mf:merge" as="node()*">
        <xsl:param name="doc1" as="document-node()"/>
        <xsl:param name="doc2-uri" as="xs:string"/>
        <xsl:sequence select="transform(map {
            'stylesheet-node' : $merge-sheet,
            'source-node' : $doc1,
            'stylesheet-params' : map { xs:QName('with') : $doc2-uri }
            })?output"/>
    </xsl:function>