Defeasible Systems in Legal Reasoning: A Comparative Assessment


Giovanni Sartor  /  Andrea Omicini, Giovanni Sartor, Roberta Calegari, Francesca Lagioia, Giuseppe Contissa

Different formalisms for defeasible reasoning have been used to represent knowl- edge and reason with it. In this work, we provide an overview of the following logic-based approaches to defeasible reasoning: Defeasible Logic, Answer Set Pro- gramming, ABA+, ASPIC+ and DeLP. We compare features of these approaches under three perspectives: the logical model (knowledge representation), the method (computational mechanisms), and the technology (available software resources). On this basis, we identify and apply criteria for assessing their suitability for legal applications. We discuss the different approaches through a legal running example.

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