Ver:
· http://www.ietf.org/rfc/rfc2119
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 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 MUST be prepared to interoperate with another
implementation which does not include the option (except, of course, for the
feature the option provides.)
within normative
text, may indicates a course of action permissible within the limits of the
document (ISO/IEC). [CC:2006]
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