<!--Select by node and group by child node-->
            <xsl:when test="$from='node-childnode'">
                <xsl:for-each-group select="$compose//*[name()=$sel]" group-by="child::*[name()=$group]">
                    <xsl:sort select="current-grouping-key()" />
                    <element key="{current-grouping-key()}">
                        <xsl:if test="number(current-group()[1])=number(current-group()[1])">
                            <xsl:attribute name="max" select="max(current-group())"/>
                            <xsl:attribute name="sum" select="sum(current-group())"/>
                        </xsl:if>
                        <xsl:copy-of select="current-group()[1]"/>
                    </element>
                </xsl:for-each-group>
            </xsl:when>

<xsl:variable name="oSel">
        <xsl:choose>
            <xsl:when test="starts-with($from,'oclass-')">
                <xsl:value-of select="$compose//*[contains(@outputclass,$sel)]"/>
            </xsl:when>
            <xsl:when test="starts-with($from,'node-')">
                <xsl:value-of select="$compose//*[name()=$sel]"/>
            </xsl:when>
            <xsl:otherwise/>
        </xsl:choose>
    </xsl:variable>

    <xsl:variable name="oGroup">
        <xsl:choose>
            <xsl:when test="ends-with($from,'-attribute')">
                <xsl:value-of select="*/@*[local-name()=$group]"/>
            </xsl:when>
            <xsl:when test="ends-with($from,'-childnode')">
                <xsl:value-of select="*/*[name()=$group]"/>
            </xsl:when>
            <xsl:when test="ends-with($from,'-parentnode')">
                <xsl:value-of select="parent::*[name()=$group]"/>
            </xsl:when>
            <xsl:when test="ends-with($from,'-followingnode')">
                <xsl:value-of select="following-sibling::*[name()=$group][1]"/>
            </xsl:when>
            <xsl:when test="ends-with($from,'-precedingnode')">
                <xsl:value-of select="preceding-sibling::*[name()=$group][1]"/>
            </xsl:when>
            <xsl:otherwise/>
        </xsl:choose>
    </xsl:variable>

    <xsl:variable name="test">
        <!--<xsl:for-each-group select="saxon:evaluate($oSel)" group-by="saxon:evaluate($oGroup)">-->
            <xsl:for-each-group select="saxon:evaluate($oSel)" group-by="saxon:evaluate($oGroup)">
            <element key="{current-grouping-key()}">
                <xsl:if test="number(current-group()[1])=number(current-group()[1])">
                    <xsl:attribute name="max" select="max(current-group())"/>
                    <xsl:attribute name="sum" select="sum(current-group())"/>
                </xsl:if>
                <xsl:copy-of select="current-group()[1]"/>
            </element>
        </xsl:for-each-group>
    </xsl:variable>