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To the best of knowledge, ROS graph isolation in ROS1 relies on namespaces. So if you've consistently used relative names, you should be able to <include/> an entire launch file hierarchy from within a <group/>, which allows you to set a namespace (see http://wiki.ros.org/roslaunch/XML/group). If you haven't, or if you rely on code that doesn't (e.g. tf2 is likely hitting /tf and /tf_static), you can explicitly <remap/> within each group (see http://wiki.ros.org/roslaunch/XML/remap). Some node in the root namespace can then target any topic using fully qualified names.