Example: "These capabilities and interfaces will not match every existing content management system and MAY require some level of change to existing products, at least in terms of conforming"

The terminology defined in IETF BCP 14 (RFC 2119) should be used solely for the purpose of defining requirements. Please do not use it anywhere else, and also please use is sparingly:

"6. 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 retransmisssions) For
example, they must not be used to try to impose a particular method
on implementors where the method is not required for
interoperability." – <http://tools.ietf.org/html/rfc2119#section-6>