[About InfoSet] One thing needs to make clear..

When I recently reviewed the W3C Recommendation "XML Infomation Set"(available at http://www.w3.org/TR/xml-infoset/), I found there was a little problem with the recommendation.

The recommendation says in its introduction:

"In this specification, the words "must", "should", and "may" assume the meanings specified in [RFC2119], except that the words do not appear in uppercase."

However, I could not find any words "MUST", "SHOULD" and "MAY" in uppercase in the recommendation. 

Does this mean that 
[1]"must", "should" and "may" assume the meanings specified in [RFC2119], even if they appear in lowercase, or
[2] all these words do not conform to [RFC2119]?




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