Ver:
· http://www.ietf.org/rfc/rfc2119
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.
within normative
text, should indicates that among several possibilities one is recommended as
particularly suitable, without mentioning or excluding others, or that a
certain course of action is preferred but not necessarily required. (ISO/IEC)
The CC interprets 'not necessarily required' to mean that the choice of another
possibility requires a justification of why the preferred option was not
chosen. [CC:2006]
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