Continuous/Not continuous frame

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Hello all, I am reading the Coordinate Frames for Mobile Platforms: https://www.ros.org/reps/rep-0105.html And I can't understand the difference between Continuous/Not continuous frame. In fact, according to the above link, the pose of a robot in the Odom frame is guaranteed to be continuous, while the map frame is not continuous. Is there someone who can explain to me the continuity of frame? also, the difference between the above frames? Thank you.