Cooperation between planners is essential when solving many complicated problems in planning. In this paper, the authors discuss their knowledge sharing methodology for planning which is manifested in a framework, called KII (the Knowledge Interchange Interface). The KII is used to realize cooperation between heterogeneous planning systems. Cooperation takes place in a peer-to-peer manner through a common ontology. The KII consists of five integrated modules which are used to provide knowledge translation into and out of the defined common ontology language from the local knowledge representations and also to provide communication between the planning systems.
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