The contents of the PARC AOP page have moved.
If you're looking for information on Aspect-Oriented Programming (AOP) or Aspect Oriented Software Development (AOSD) please visit:
http://aosd.net - The aosd.net site is intended to be a comprehensive source of information of information for Aspect-Oriented Software Development, and supports mailing lists related to AOSD.
If you're looking for Xerox PARC's research on AOP please visit:
http://aspectj.org - AspectJ is a seamless aspect-oriented extension to Java that enables the modular implementation of a wide range of crosscutting concerns.
or
http://www.parc.xerox.com/csl/groups/sda - The goal of the Software Design Area at Xerox PARC is simple and long-standing: to make it possible to cleanly capture complex design structures in software implementations.