<?xml version="1.0"?> <model> <name>Double pendulum with base</name> <version>1.0</version> <sdf version="1.3">model-1_3.sdf</sdf> <sdf version="1.4">model-1_4.sdf</sdf> <sdf version="1.5">model.sdf</sdf> <author> <name>Steve Peters</name> <email>scpeters@osrfoundation.org</email> </author> <description> A double pendulum with cylindrical shapes and rotation on the x axis. The pendulum is attached to a heavy base that rests on the ground. </description> </model>