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You are close, but what should work is the following small change to how you pass an argument tag inside of an include tag:

  <arg name="Kinect" value="1"/>
  <group if="$(arg Kinect)">
    <include file="$(find openni_launch)/launch/openni.launch">
      <arg name="camera" value="openni"/>

Also, you can use true instead of 1 in the value for your Kinect arg, and it is nice when you use default instead of value, like they did in openni.launch, since it makes it easier for launch files that include your launch file to modify the arguments.