[xsl] Group by parameters tag

Hello again!

How I can apply this template that group by tags, but instead of comme  
one parameter, commes more than one?
<xsl:stylesheet version="2.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns="http://bibtexml.sf.net/";
    xmlns:b="http://bibtexml.sf.net/";>

    <xsl:strip-space elements="*"/>
    <xsl:output indent="yes" omit-xml-declaration="yes"/>

    <xsl:param name="name"/>

    <xsl:template match="*">
        <xsl:copy>
            <xsl:copy-of select="@*"/>
            <xsl:for-each-group select="node()" group-by="local-name()=$name">
                <xsl:choose>
                    <xsl:when test="current-grouping-key()">
                        <!--<xsl:element name="{$name}">-->
                        <xsl:element name="{$name}">
                            <xsl:for-each select="current-group()">
                                <xsl:apply-templates/>
                                <xsl:if test="position()!=last()">  
and <xsl:if>
                            </xsl:for-each>
                        </xsl:element>
                    </xsl:when>
                    <xsl:otherwise>
                        <xsl:apply-templates select="current-group()"/>
                    </xsl:otherwise>
                </xsl:choose>
            </xsl:for-each-group>
        </xsl:copy>
    </xsl:template>


</xsl:stylesheet>


Thank you,

Izaskun




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