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Adapting LPGP to Plan with Deadlines

This paper describes two approaches that enable the AI Planner LPGP to reason about domains with exogenous events and goals with duration: the first investigates how such domains may be encoded using the planning domain definition language PDDL2.1 level 3, while the second involves directly modifying LPGP. Both approaches have been tested in a number of domains and conclusions are drawn about the relative merits of the two approaches.