IANA media-types registry boundary

Evidence-backed facts

1. Internet Assigned Numbers Authority documents registered top-level media types, subtypes, templates, references, and registration metadata. informative
2. Public reads do not grant type registration, content validation, protocol conformance, vendor authority, or IANA administrative authority. informative
3. Clients must bind top-level type, subtype, registration tree, reference, template, encoding consideration, and registry update state. informative
4. Registry presence identifies a registered name and reference; it does not prove a payload is valid, safe, interoperable, correctly labeled, or current in every implementation. informative

Primary sources