2. Terminology

The BCP 14 key words MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, NOT RECOMMENDED, MAY, and OPTIONAL are interpreted as described in RFC 2119 and RFC 8174 only when they appear in all capitals.

Examples in this RFC may be truncated with "..." for readability. Those ellipses are part of the displayed example style, not permission to reinterpret the registered values.