using variables in xsl value of select

hi,

i am loading an xml into a variable using the document as 

   <xsl:variable name="srcxml" select="document('QP_Sample.xml')" />  

i have certain conditions to check and then am getting the node whose value has to be retrived from this xml

<xsl:variable name="node">
                       <xsl:call-template name="tail">
                            <xsl:with-param name="string" select="@ref"/>
                        </xsl:call-template>                
</xsl:variable>   

this node gives me the end of the node for example if i have 
A/B/C/D then this tail template returns D into my node

I would like to get the value of this node from the above xml for which i am using

<xsl:value-of select="$srcxml//$node"/>

which is not working as maybe it checks for $node element in my srcxml. i would like to get it in a generic way. please guide me and correct my mistake

with regards,
Prasad Akella
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