Attached Link: http://astronomy.swin.edu.au/~pbourke/geomformats/rib/

RIB is intended as input for RenderMan renderers and contains only information relevant to rendering - no joint parameters, no keyframes, no morphs etc. Poser's RIB export allows you to render Poser scenes directly in 3Delight, PRMan, BMRT or Aqsis (without the help of D|S) but it's fairly useless as an exchange format between applications. Stefan