[Bug 29498] [FO31] Some normative RFC 2119 MAY/SHOULD etc appear in non-normative Notes, RFC itself is not mentioned in conformance section

https://www.w3.org/Bugs/Public/show_bug.cgi?id=29498

--- Comment #2 from Michael Kay <mike@saxonica.com> ---
To add to this: the RFC definition of MUST is:

MUST   This word, or the terms "REQUIRED" or "SHALL", mean that the
   definition is an absolute requirement of the specification.

Whereas the F+O definition is much more nuanced:

When the sentence relates to the arguments to a function (for example "The
value of $arg must be a valid regular expression") then the implementation is
not conformant unless it enforces the condition by raising a dynamic error
whenever the condition is not satisfied.

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