<xsl:template match="/">
       <Metadata>
               <xsl:copy-of select="namespace::node()"/>
       </Metadata>
</xsl:template>

<xsl:template match="/manifest">
  <Metadata>
     <xsl:copy-of select="namespace::*"/>
  </Metadata>
</xsl:template>

<xsl:template match="manifest">
 <xsl:variable name="x" select="." />
 <Metadata>
   <!-- create namespace declarations -->
   <xsl:for-each select="in-scope-prefixes($x)">
     <xsl:namespace name="{.}"><xsl:value-of
select="namespace-uri-for-prefix(., $x)" /></xsl:namespace>
   </xsl:for-each>

   <!-- do rest of things -->
 </Metadata>
</xsl:template>

--
Regards,
Mukul Gandhi