# OKF Specification Reference

ExOKF implements [Open Knowledge Format v0.1](https://github.com/GoogleCloudPlatform/knowledge-catalog/blob/main/okf/SPEC.md).

Normative source of truth:

https://raw.githubusercontent.com/GoogleCloudPlatform/knowledge-catalog/main/okf/SPEC.md

Conformance (OKF §9):

1. Every non-reserved `.md` file has parseable YAML frontmatter
2. Every frontmatter block has a non-empty `type`
3. Reserved files (`index.md`, `log.md`) follow §6 / §7 when present

Consumers MUST NOT reject bundles for missing optional fields, unknown types,
unknown keys, broken cross-links, or missing `index.md` files.