!!! Overview
[{$pagename}] ([BCP 14]) is a [Best Current Practice] ([BCP])[RFC 2119] comprise [BCP 14] where [RFC 8174] clarifies that only __UPPERCASE__ usage of the keywords have the defined special meanings.

[{$pagename}] includes:
* [MUST]
* [MUST NOT]
* [SHOULD]
* [SHOULD NOT]
* [MAY]!! Guidance in the use of these Imperatives
Imperatives of the type defined in this memo must be used with care and sparingly.  In particular, they [MUST] only be used where it is actually required for interoperation or to limit behavior which has potential for causing harm (e.g., limiting retransmissions)  For example, they must not be used to try to impose a particular method on implementors where the method is not required for interoperability.

!! [Security Considerations]
These terms are frequently used to specify behavior with security implications.  The effects on security of not implementing a [MUST] or [SHOULD], or doing something the specification says [MUST NOT] or [SHOULD NOT] be done may be very subtle. Document authors should take the time to elaborate the security implications of not following recommendations or requirements as most implementors will not have had the benefit of the experience and discussion that produced the specification.

!! More Information
There might be more information for this subject on one of the following:
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