% Specification Terminology % % Intended to be included within its own section. Portions of this section conform to \rfc{2119}: ``Key words for use in RFCs to Indicate Requirement Levels''. Certain terms from the RFC have been expressly avoided; for example, the terms ``should'' and ``should not'' are not used because this specification's audience has the capability to alter the specification to resolve implementation issues and should exercise that ability. \begin{description} \dt{conforming implementation} A software implementation that strictly conforms to this specification. \dt{Deprecated} When used within context of this specification: the feature or requirement will be removed in future revisions of this specification. \dt{Exempt} Denotes a condition under which an implementation need not conform to a requirement. \dt{implementation} Software that implements this specification. \dt{May; Optional} Alternatively, the adverb ``optionally''; denotes a requirement whose implementation is not required and may be omitted; such \shall be used only to provide flexibility for implementors to exercise their best judgment or to denote requirements that are not essential to the operation of the implementation. \dt{Removed} A feature or requirement mentioned in an earlier revision of this specification has been removed and will not be superseded. \dt{section} The section containing this term, as well as any subsections contained within it. \dt{Shall; Must} Denotes a mandatory requirement. \dt{Shall Not; Must Not} Denotes an absolute prohibition. \dt{Superseded} The feature or requirement mentioned in an earlier revision of this specification has been removed and replaced by another. \dt{Undefined} The error condition results in behavior that is not defined by a particular standard; this term \shall be used only to document other standards or specifications---it \shall not be used to introduce undefined behavior into this specification. \dt{Unspecified} The behavior is not determined by this specification or is inconsequential to the implementation's operation. \end{description}