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/*!\page rfc2119 RFC2119 Keywords 
 
 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL 
 NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and 
 "OPTIONAL" in this document are to be interpreted as described in 
 <a href="http://www.ietf.org/rfc/rfc2119.txt">RFC 2119.</a> 
 
Specifically, the following definitions are used: 
 
\section MUST 
\anchor REQUIRED 
\anchor SHALL 
 This word, or the terms "REQUIRED" or "SHALL", mean that the 
 definition is an absolute requirement of the specification. 
 
\section MUSTNOT MUST NOT 
\anchor SHALLNOT 
 This phrase, or the phrase "SHALL NOT", mean that the 
 definition is an absolute prohibition of the specification. 
 
\section SHOULD 
\anchor RECOMMENDED 
 This word, or the adjective "RECOMMENDED", mean that there 
 may exist valid reasons in particular circumstances to ignore a 
 particular item, but the full implications must be understood and 
 carefully weighed before choosing a different course. 
 
\section SHOULDNOT SHOULD NOT 
\anchor NOTRECOMMENDED 
 This phrase, or the phrase "NOT RECOMMENDED" mean that 
 there may exist valid reasons in particular circumstances when the 
 particular behavior is acceptable or even useful, but the full 
 implications should be understood and the case carefully weighed 
 before implementing any behavior described with this label. 
 
\section MAY 
\anchor OPTIONAL 
 This word, or the adjective "OPTIONAL", mean that an item is 
 truly optional. One vendor may choose to include the item because a 
 particular marketplace requires it or because the vendor feels that 
 it enhances the product while another vendor may omit the same item. 
 An implementation which does not include a particular option \ref MUST be 
 prepared to interoperate with another implementation which does 
 include the option, though perhaps with reduced functionality. In the 
 same vein an implementation which does include a particular option 
 \ref MUST be prepared to interoperate with another implementation which 
 does not include the option (except, of course, for the feature the 
 option provides.) 
 
 
*/