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"3.2 Requirement A: Use a consistent style for conformance requirements and explain how to distinguish them." mentions that RFC2119 terms are uppercase, but it should be noted that nothing in RFC2119 (other than consistent usage as such) requires them to be used in uppercase, despite specifications frequently explicitly mentioning that they use lowercase variants instead.
http://lists.w3.org/Archives/Public/www-qa-wg/2005Feb/0028.html http://www.w3.org/Bugs/Public/show_bug.cgi?id=1044 KD will rewrite the text [AI-20050214-4] and send it to the QA WG list. Due date is February 21.
http://www.w3.org/mid/7b37d825183d6e974d0b0bc3a64c0999@w3.org Text clarifies that using distinctive appearance (markup or font weight) is only the usual practice, rather than mandated.
setting version to LC in case of future use