Recursive teplate (sort)

I have just this situation :


<xsl:template match="/">
<xsl:for-each select="/root" >
<xsl:for-each select="my_node" >
<xsl:for-each select="my_node_parallel" >

<!--I Create Variable and calculate value for totale_finale--> 
<--!I need to order using totale_finale value -->

<xsl:value-of select="format-number($totale_finale,'#.##')" />

</xsl:for-each>
</xsl:for-each>
</xsl:for-each>

</xsl:template>


How can I do node-set able to sorting this kind of template ?

Thanks in advance.
Regards.