From Affogato

Introduction

Affogato supports export of particles and data like color & opacity automatically

Note: Particle data can't be read at sub-frames times in XSI at all, Affogato extrapolates positional data using velocities for subframes. Particle sizes hence can't be motion-blurred currently as there is no delta available from XSI for that data. A workaround would be possible, but it involves a little bit of work. If you need particles, better use Houdini.