This should do the trick I think:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <!-- 
            <m value="10">
                <i value="5">
                <m value="10">
                    <i value="2"/>
                    <i value="2"/>
                    <i value="2"/>
                </m>
            </m>

            10 * (5 + (10 * (2 + 2 + 2)))
        -->
    <xsl:template match="/">
        <xsl:apply-templates/>
    </xsl:template>

    <xsl:template match="m">
        <xsl:value-of select="@value"/>
        <xsl:if test="child::*"> * (<xsl:apply-templates 
select="*[1]"/>)</xsl:if>
    </xsl:template>

    <xsl:template match="i">
        <xsl:value-of select="@value"/>
        <xsl:if test="following-sibling::*"> + <xsl:choose>
                <xsl:when 
test="(following-sibling::*)[1]/*">(<xsl:apply-templates 
select="(following-sibling::*)[1]"/>)</xsl:when>
                <xsl:otherwise>
                    <xsl:apply-templates 
select="(following-sibling::*)[1]"/>
                </xsl:otherwise>
            </xsl:choose></xsl:if>
    </xsl:template>
</xsl:stylesheet>



"[Gizmo]" <nuno.carlos.viana@g...> wrote in message 
news:1160382062.771240.215790@c......
> Hi guys, I have been browsing your forums on a daily basis and have
> found
> many answers to many of my problems! Thanks!!!
>
> I now need your help!
>
> I have the following XML file, which represents expressions with "+"
> and "*"
> artihmentic operands:
>
> <m value="10">
>   <i value="5"/>
>   <m value="10">
>      <i value="2"/>
>      <i value="2"/>
>      <i value="2"/>
>   </m>
> </m>
>
> This represents the following expression:
> 10 * (5 + (10 * (2 + 2 + 2)))
>
> I want to compute the expression's value (for the given example, the
> result
> should be 650).
>
> Can anyone help me achieve this through a single recursive template?
>
> Many thanks to you all!
>
> Nuno
>