Abstract-This article presents a middle-out approach to build legal domain reference ontology for a Legal Knowledge Based System (LKBS). The proposed approach is a combination of top-down and bottom-up strategies. In particular, we propose to develop legal domain reference ontology, splitted into modules or fragments, based on merging two processes: Conceptual Modeling Process, by reusing foundational ontologies (top-down strategy) and Ontology Learning Process from textual resources (bottom-up strategy).Index Terms-Conceptual modeling, domain reference ontology, legal ontology, modularization, ontology learning.

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