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I am referring to the following tutorial . http://wiki.ros.org/ROS/Tutorials/UsingRqtconsoleRoslaunch

Here is the following xml file as given in the tutorial.

<launch>

  <group ns="turtlesim1">
    <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
  </group>

  <group ns="turtlesim2">
    <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
  </group>

 <node pkg="turtlesim" name="mimic" type="mimic">
   <remap from="input" to="turtlesim1/turtle1"/>
   <remap from="output" to="turtlesim2/turtle1"/>
 </node>

</launch>