what are the differences between a low level streaming interface described in ROS-Industrial specification and the streaming interface in industrial_robot_client?

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Hi! I looked through the industrial_robot_client/generic_implementation page (here's the link http://wiki.ros.org/industrial_robot_... have confusion. There is a Note in this page: NOTE: The ROS-Industrial specification does allow for a low level streaming interface (sending individual points to the robot, different than the streaming interface below). This is not supported currently by the generic clients. I don't understand the difference between these two streaming interface. Who can give me some explanation? Thanks！