The normative documents behind the protocol. The vocabularies say what a record can mean; these say how a conforming implementation writes it down, lays it out, and versions it.
Serialization Specification
The RDF/Turtle serialization format: required namespace prefixes, canonical ordering rules, literal typing, and the round-trip guarantees a conforming writer must meet.
Read the specPod Structure Specification
Directory layout, file naming, type registration, and the discovery conventions that let any implementation find the records in a Pod it did not create.
Read the spec Reference podVersioning Policy
How vocabularies are versioned MAJOR.MINOR, what backward compatibility guarantees hold within a major version, and how a draft vocabulary becomes a ratified one.
Read the policyMachine-readable sources
The ontologies and shapes themselves are the authority. Everything on this site is generated from, or checked against, the files in the specification repository.
Vocabulary reference
OWL class and property definitions for every ratified and draft vocabulary, with their SHACL shapes and JSON-LD contexts.
Browse vocabularies Schema referenceComplete reference for AI assistants
Every ontology, shape, specification, and guide concatenated into a single plain-text file, regenerated from the specification repository and gated on a version check.
llms-full.txt llms.txtSpecification repository
The only place vocabulary is authored. Every other surface, including this site, syncs from it.
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