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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

Building on a formal, event-driven model for the temporal evolution of legal norms based on the IFLA Library Reference Model (LRMoo), this paper addresses the first step in publishing the model's core entity, the Abstract Legal Work (F1), on the Semantic Web. We propose a detailed, attribute-specific mapping of the LRMoo F1 Work to the widely used schema.org/Legislation vocabulary. Using the Brazilian Federal Law from the Normas.leg.br portal as a practical case study, we demonstrate how to generate interoperable, machine-readable descriptions via JSON-LD, focusing on stable URN identifiers, core metadata, and normative relationships. This structured mapping establishes stable, URI-accessible anchors for each legal norm, creating a verifiable "ground truth." This provides an essential, interoperable foundation for building subsequent layers of the model, such as temporal versioning (representations) and internal components. By bridging formal ontologies with Web-native standards, this work overcomes the limitations of purely probabilistic models and paves the way for building deterministic and reliable Legal Knowledge Graphs (LKGs).

Takeaways, Limitations

Takeaways:
We present a method for publishing legal norms on the Semantic Web by mapping the LRMoo F1 Work to the schema.org/Legislation vocabulary.
Generate interoperable, machine-readable descriptions using JSON-LD.
Build a "ground truth" for legal norms by leveraging stable URN identifiers, core metadata, and normative relationships.
Provides a foundation for building deterministic and reliable legal knowledge graphs (LKGs).
Limitations:
Because we used Brazilian federal law as a case study, further research is needed to determine generalizability to other legal systems.
There is a lack of specifics about the implementation of subsequent layers, such as temporal versions (representations) and internal components.
There is a lack of comparative analysis with purely probabilistic models.
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