نبذة مختصرة : Today, every aspect of society’s activities is regulated by laws from the national and local levels. The increasing number of legal documents interwoven with each other also leads to difficulties in searching and applying in practice. In addition, later legal documents may change or invalidate previous legal documents. The construction of knowledge maps that involve one or a group of legal documents is an effective approach to represent actual knowledge domains. A legal knowledge graph constructed from laws and legal documents can enable a number of applications, such as question answering, document similarity, legal search, legal information retrieval, and legal argument claims. In this paper, we describe an ontology-based knowledge map approach for building a Vietnamese legal linked data from the source of about 325,000 legal documents. This study includes an integrated ontology to represent the legal knowledge from legal documents. This model integrates the ontology of relational knowledge and the graph of entities in the form of a concept graph. It can express the semantics of the content of a given legal document. In addition, this study also addresses potential legal applications, which can use the built linked data as a foundation resource of legal. We also highlight open challenges in the realization of knowledge graphs in a technical legal system that enables this approach at scale.
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