The AOP notation (%aop) is a definitive notation used to define the parser rules of the Agent Oriented Parser (AOP). The Agent Oriented Parser was first construced by Chris Brown (2001) and later developed by Anthony Harfield (first in 2003). The AOP Notation was first written in Ant Harfield's AOP by Charlie Care (2005). After initial testing, a new AOP (courtesy of Ant Harfield) and a slightly modified AOP notation were included in version 1.65 of the EDEN tools. In this and all subsequent versions, there should be a radio button labeled %aop.