XML/XSLT NameSpace Problem

Hi, everybody !
What should I specify in <xsl:stylesheet> element of my XSLT
to retrieve data from XML Document a few tags of which (including top level
element)
containing prefixed names , for example :

<env:Envelope>
     <env:Header>
       .......
    </env:Header>
    <env:Body>
       .......
    </env:Body>
</env:Envelope>

Any help will be appreciated. Thanks.


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