First, you need to learn how to use Templates. A Template is similar to a 
function, but it is applied using either a match expression or a name. 
Templates are generally better to use than for-each elements, in the same 
way that functions are generally better to use than looping statements. To 
sort, you can use a Template or a for-each element.

I would start by getting rid of the nested for-each elements in your markup:

<xsl:tamplate match="/">
    <xsl:apply-templates select="root/my_node/my_node_parallel >
        <xsl:sort  select="format-number($totale_finale,'#.##')" />
    </xsl:apply-templates>
</xsl:template>

<xsl:template match="my_node_parallel">
    <!-- This template is already sorted. Add whatever you need here -->
</xsl:template>

-- 
HTH,

Kevin Spencer
Microsoft MVP
Computer Control Freak
http://unclechutney.blogspot.com

A man, a plan, a canal, a palindrome that has.. oh, never mind.

"Ghena" <lastminutesud@g...> wrote in message 
news:1160388071.826240.290980@k......
>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.
>