This paper highlights that structuring legal norms in a machine-readable manner is essential for building advanced AI and information retrieval systems, such as Legal Knowledge Graphs (LKGs). Based on the FRBR model, we propose a basic framework for mapping legal operations (embodied as Norm nodes) to the schema.org/Legislation vocabulary. Using the Normas.leg.br portal as a case study, we demonstrate how to describe operation entities using JSON-LD, taking into account stable URN identifiers, inter-norm relationships, and lifecycle properties. This structured and formal approach provides a first step toward building deterministic and verifiable knowledge graphs, which can overcome the limitations of purely probabilistic models and serve as a formalized "ground truth" for legal AI applications.