The Legal Knowledge Interchange Format (LKIF) is an XML Schema for representing theories and arguments (proofs) constructed from theories ESTRELLA Project (2008). A theory in LKIF consists of a set of axioms and defeasible inference rules. The language of individuals, predicate and function symbols used by the theory can be imported from an ontology represented in the Web Ontology Language (OWL). Importing an ontology also imports the axioms of the ontology. All symbols are represented using Universal Resource Identifiers (URIs). Other LKIF files may also be imported, enabling complex theories to modularized.
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