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.sdf and .world file (correct usage)


I have been using Gazebo for about a year now and I am still very confused about .sdf and .world files. Are they the same thing? Some of the tutorials use .world file to make a world ( and some use an .sdf file ( and its even called my_world.sdf, very confusing.

Am I correct in saying that the old deprecated usage would we to use a .urdf to model a robot and a .world file to model the word. And now we should just be able to use a single .sdf file?

Either way it would be nice if the tutorials were consistent with the usage of these file formats, or at least explained the proper usage.