“This short lesson from Noesis Interactive outlines the steps to “tag a rig” in Softimage/XSI. This process teaches you how to set up your rigs so that you can re-target animations and apply motion capture data to different 3D characters. Animators and Riggers focusing on video game development will find this tutorial very useful.”
http://www.cgarena.com/freestuff/tutorials/xsi/noesis_xsi/taggingarig.html