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<Root>
 <Top>
  <Module name="ALU">
...
  <bidirection name="ctrl"/>
 </Root>
</Top>

open(IN_FILE, "<datamod.xml") or die "Cant open input file";
 open(TM1_FILE, ">tm1.xml") or die "Cant Open tm1.xml";
...
}
close TM1_FILE;
close TM2_FILE;

   <Root>
      <Top>
...
       <bidirection name="ctrl"/>
      </Top>
    </Root>

<Root>
 <Top>
...
  </Module>
</Root>
</Top>