A domain model represents the business operations and data models behind an API, giving design work a shared view of the problem before requirements become API definitions. section 5.1 section 1.3
Use the model to:
- Translate user stories or job stories into API requirements and definitions. section 5.1 section 1.3
- Give API designers and reviewers shared context for discussing design decisions and consistency. section 5.1
- Support API-first planning before backend implementation, testing, deployment, and publication. section 1.3
The model belongs in the plan-and-design stage. It simplifies surrounding complexity to emphasize selected points rather than documenting every low-level delivery process, and it can be refined as API design proceeds. section 1.3 section 5.1







