Building an artificial reasoner that can causally reason on legal cases in a valid way should be based in the first place on jurisprudential accounts. These accounts presume that a common-sense causal description is available and almost self-evident. However, formal theories in philosophy and computational ones in Al make this assumption at least questionable, if not problematic. At least, we need to enhance these jurisprudential views with some (formal) conceptualization of common sense notions on causality. To enable a merging of the legal theoretical views with Al oriented views on common sense causality an ontology is constructed, consisting of a specification of the concept of event, which is generally considered as the basic building-block of causal reasoning. Our specification of an event is founded on a few general assumptions, that on their turn are based on a critical review of the philosophical and Al debates about causation.
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