The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" are to be interpreted as described in RFC 2119.
The key words "unspecified", "undefined", and "implementation-defined" are to be interpreted as described in the rationale for the C99 standard.
An implementation IS compliant if it satisfies all the MUST, REQUIRED, and SHALL requirements.
An implementation IS NOT compliant if it fails to satisfy one or more of the MUST, REQUIRED, or SHALL requirements.