See the [rationale section in REP-0127](http://www.ros.org/reps/rep-0127.html#data-format). The gist is that package.xml gets parsed rather often and Python XML parsing was found to be an order of magnitude faster than YAML. --- [Visit Topic](https://discourse.ros.org/t/why-do-we-have-package-xml-instead-of-package-yaml-in-ros2/3970/2) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: