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An ActionServer/ActionClient communicate with each other using 5 topics with specific names: cancel, feedback, goal, result, status.

That box is removing clutter from the diagram by not explicitly listing these 5 well-known topic names.

See http://wiki.ros.org/actionlib for a poorly-written description of actionlib.

An ActionServer/ActionClient communicate with each other using 5 ros topics with specific names: cancel, feedback, goal, result, status.

That box is removing clutter from the diagram by not explicitly listing these 5 well-known topic names.

See http://wiki.ros.org/actionlib for a poorly-written description of actionlib.