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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.)
- */
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