xsl help!!!

hallo,
i would like to print a value of variable in the
doctype declaration of a document, how to do it? given
below is an example

<xsl:variable name="myname"
select="concat('-//S-V//DTD A++ V',$version,'//EN')"/>
//here is version is one more vaiable.

//Now I need to print the value of myname in the
doctype declaration like this
<xt:document href="{$file}" method="xml"
doctype-public="">

what statement should be used to print the value of
vaiable myname in the doctype-public.

thanxs,
sri...


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