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Until ROS Bouncy, the full topic names were constructed as follow: <ROS_PREFIX>/<NAMESPACE>/<TOPIC_NAME> where:

ROS_PREFIX is one of the prefixes defined here

Some examples can be found here

The partition value is everything before the last forward slash. In you case I assume that the namespace is ros, resulting in a fully qualified topic name rt/ros/my_topic. This leads to the partition rt/ros and the topic name my_topic.

Note that as of ROS Bouncy the partitions are not used anymore so for the topic rt/ros/my_topic the partition will be an empty string and the DDS topic name will be rt/ros/my_topic