Steven Roselle shows a brief overview of the ATOM or the Animation Transfer Object Model that is new to Maya 2013. ATOM is a new XML based import and export routine for transferring attributes and animations between Maya scenes, providing flexibility in transferring base animations, animation layers, set driven keys and constraints.
Steven Roselle writes: The ATOM (Animation Transfer Object Model) file type lets you efficiently save animation from one object (or hierarchy) and reload it onto another. Exporting animation lets you build up a library of poses and animation that can be readily shared and reused by other animators, in other scenes, or on other projects. You can import and export animation for entire sequences, or simply to reuse specific poses.