[xsl] Conditional sort instruction as parameter within group && Syntacti

I can sort on putAmount by exploiting the data engine through API. But I can't 
seem to achieve the same sort effect in pure XSLT. 
Below is my XSLT module extract as part of the Stage Two implementation:

    <xsl:template match="result">
        <xsl:variable name="doc" select="document(@uri)"/>
        <xsl:element name="Trade">
            <xsl:element name="documentId"><xsl:value-of 
select="$doc/product:requestProduct/product:_metaData/product:docId"/></xsl:element><!--
 Line 55 -->
            <Justification>
                <xsl:for-each select="descendant::match">
                    <path><xsl:value-of select="@path"/></path>
                    <highlight><xsl:value-of select="highlight"/></highlight>
                </xsl:for-each>
            </Justification><!-- Line 60 --> 
<!-- Line 71:: Traverse XML and JSON --> 
            <xsl:copy-of 
select="incarnation:render-def(fn:normalize-space(@uri))"/>
        </xsl:element>
    </xsl:template>
Thus,
Question One: The conditional sort is based on the search:highlight, if it is 
decimal, sort the putAmount and then incarnate the document. Notice: The 
"Rationale" is that currency and amount must be paired. In each search:snippet, 
the currency is one search:highlight while amount another. I would imagine a 
pure XSLT conditional sort in below manner.
=====================================================     <xsl:param 
name="sortAmount">
        <xsl:for-each select="highlight">
            <xsl:sort select="if (normalize-space() castable as xs:decimal) 
then descending
                else ()"/>            
        </xsl:for-each>
    </xsl:param>
    
    <xsl:template match="result">
        <xsl:variable name="doc" select="document(@uri)"/>
        <xsl:element name="Trade">
            <xsl:for-each-group select="." group-by="@uri">
                <xsl:call-template name="sort-render">
                    <xsl:with-param name="sortAmt" select="$sortAmount"/>
           <!--         <xsl:with-param name="uri" 
select="current-grouping-key()"/> -->
                </xsl:call-template>
            </xsl:for-each-group> 
        </xsl:element>
    </xsl:template>          
    
    <xsl:template name="sort-render">
        <xsl:param name="sortAmt"/>
 <!--       <xsl:param name="uri"/> -->
        <Justification inDocument="{@uri}">
            <xsl:for-each select="descendant::match">
                <path><xsl:value-of select="@path"/></path>
                <highlight><xsl:value-of select="highlight"/></highlight>
            </xsl:for-each>
        </Justification>
    </xsl:template>
======================================================Above doesn't sort the 
decimal search:highlight. The /a.xml is still incarnated first in the Oxygen 
(without the data engine support). I don't know if there is a pure XSLT 
solution for this. Can the XSLT expert help? 
Question Two: Below produces the same result by replacing Line 55 - 60 in my 
original XSLT module. Can someone point out if below module is syntactically 
correct? (It runs fine in the Oxygen.)
        <xsl:for-each-group select="." group-by="@uri">
            <Justification inDocument="{current-grouping-key()}">
                <xsl:for-each-group select="current-group()" group-by="snippet">
                    <xsl:for-each select="descendant::match">
                        <path><xsl:value-of select="@path"/></path>
                        <highlight><xsl:value-of 
select="highlight"/></highlight>
                    </xsl:for-each>
                </xsl:for-each-group>
            </Justification>
        </xsl:for-each-group>
Thank you...
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