[xsl] getting the child element based on attribute

[ram <ram_kurra@xxxxxxxxxxx>]

Hi,
     I am trying to read an xml in xsl,based on QMName,i need to get the
child element value.

Here is my xml file

<Config-Policy>
   <Policy
QMName="BRKQM">     
      <QMNumber>01</QMNumber>      
   </Policy>
<Policy QMName="BSKQM">     
      <QMNumber>02</QMNumber>      
   </Policy>
</Config-Policy>

     If let us suppose QMName is BRKQM i need to get save it
on variable
     and based on this i need to take the QMNumber and save it in
a variable
          similar case with BSKQM as well.


Here is my xsl
<xsl:template match="/">
     	<xsl:variable name="qmName"
select="dp:variable('var://context/MYMQMD/QMName')" />
	<xsl:variable
name="config"			select="document('local:///QM_Mapping.xml')" />
<xsl:variable name="configQMName"
select="$config/Config-Policy/Policy[@QMName=$qmName]" />
	<xsl:variable
name="qmNumber" select="$configQMName/QMNumber" />
</xsl:template>


    But i
am getting nothing from these variables.
         Can any one suggest how
should i proceed on this