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Recently, Automated Planning techniques have achieved significant advancements and numerous powerful planning engines have been developed. In order to reason about a given problem, domain-independent planners need a formal definition of the domain model (symbolic description of the environment and actions) and a formal description of the specific problem. Acquisition, validation, and verification of planning domain models are complex and usually error-prone processes, and represent a subset of the wider area of knowledge engineering in planning and scheduling. 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