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Dynamic Assertion and Retraction of Conceptual Graphs

This paper proposes an extension to conceptual graphs that captures dynamic aspects of knowledge. This extension is necessary, because some kinds of temporal notions are not effectively represented by conceptual graphs containing only concepts, relations and actors [Sowa84]. The following work is based on the belief that a fundamental extension to conceptual graphs is needed that captures the temporal idea of a process or transformation. A new conceptual graph node type called a demon is proposed. This new node was briefly introduced in a previous workshop; the current work expands on the ideas presented there [Delugach90].