is it possible to run and quit launch files from code inside a node?

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I don't know if there's a ROS-prescribed way to run a launch file from within another ROS node. As for stopping all the nodes within a launch file, one way to do it is mark at least one of the nodes as required, e.g.,

<node pkg="rosbag" type="play" name="rosbagplay" args="test.bag" required="true"/>

If I put this in a launch file, then when rosbag exited after the bag file was done playing, all the nodes in that launch file would stop as well.

I've put my method into the answer of this similar question, though it is possibly prone to breaking if and when roslaunch internals are altered: http://answers.ros.org/question/10493...