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Legal Knowledge Graph Foundations, Part I: URI-Addressable Abstract Works (LRMoo F1 to schema.org)

Created by
  • Haebom

Author

Hudson de Martim

Outline

This paper addresses the first step in publishing abstract legal works (F1), the foundational entities of the IFLA Library Reference Model (LRM), on the Semantic Web, based on a formal, event-driven model for the temporal evolution of legal norms. It presents a mapping of F1 works in the LRM to the widely used schema.org/Legislation vocabulary and their properties. Using the Brazilian Federal Laws portal (Normas.leg.br) as a practical case study, it demonstrates how to create interoperable and machine-readable descriptions via JSON-LD. This structured mapping, focusing on stable URN identifiers, core metadata, and normative relationships, establishes a stable, URI-addressable anchor for each legal norm, providing a verifiable "ground truth." This provides an essential interoperable foundation for building subsequent layers of the model, such as temporal versions (representations) and internal components. By bridging formal ontology and Web-native standards, this research overcomes the limitations of probabilistic models and paves the way for building deterministic and reliable Legal Knowledge Graphs (LKGs).

Takeaways, Limitations

Takeaways:
schema.org/Legislation Presentation of a method for representing the meaning of legal works on the web using vocabulary
Presenting a method for creating interoperable and machine-readable legal data using JSON-LD.
Providing a verifiable "foundation" for legal norms based on stable URN identifiers.
Overcoming the limitations of probabilistic models and suggesting the possibility of building a deterministic and reliable legal knowledge graph (LKG).
Laying the foundation for a model of the evolution of legal norms over time based on LRM
Limitations:
Only a case study of Brazilian federal law is presented; generalizability to other countries or legal systems needs to be verified.
Lack of specific implementation suggestions for the subsequent layers of the model (temporal versions, internal components)
schema.org/Legislation Insufficient response to the continuous development and change of vocabulary
Further research is needed to ensure interoperability with various legal data formats.
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