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).