ref: bb117189e0ac0c9f3efed2073961381463b6ddfc
dir: /keywords.dox/
/*!\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.)
*/