Modify XML and pass it to a template

Hello,
  I would like to modify the XML input and then pass it to a template. Is it 
possible? I want change a value and only after made it, pass the xml to the 
template. I suppose that my xsl will be like the following and in the part of 
????? I must insert the code to modify the content of variable 'contenuto'.

[code xsl]

<xsl:template match="/">
     <xsl:variable name="contenuto">
        <xsl:copy-of select="."/>
     </xsl:variable>

    <xsl:variable name="contenutoModificato">
        ?????
     </xsl:variable>
        
<xsl:call-template name="executeSQLoperation">
        <xsl:with-param name="param1">
        <xsl:copy-of select="$contenutoModificato"/>
        </xsl:with-param> 
</xsl:call-template>

Can someone help me? Thanks.

Kat 


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