AS
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... Applicability Statement (AS) ...
... circumstances, one or more TSs may be applied to support a particular
Internet capability. An AS may specify uses for TSs that are not
Internet Standards, as discussed in Section 7.
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An AS identifies the relevant TSs and the specific way in which they
are to be combined, and may also specify particular values or ranges
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... TS parameters or subfunctions of a TS protocol that must be
implemented. An AS also specifies the circumstances in which the use
of a particular TS is required, recommended, or elective (see section
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The broadest type of AS is a comprehensive conformance specification,
commonly called a "requirements document", for a particular class ...
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An AS may not have a higher maturity level in the standards track
than any standards-track TS ...
... than any standards-track TS on which the AS relies (see section 4.1).
For example, a TS at Draft Standard ...
... For example, a TS at Draft Standard level may be referenced by an AS
at the Proposed Standard or Draft Standard ...
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An AS shall apply one of the following "requirement levels" to each
of the TSs to which it refers:
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... (a) Required: Implementation of the referenced TS, as specified by
the AS, is required to achieve minimal conformance. For example,
IP and ICMP ...
... accepted technical wisdom suggest its desirability in the domain
of applicability of the AS. Vendors are strongly encouraged to
include the functions, features, and protocols of Recommended TSs
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... within the domain of applicability of the AS; that is, the AS
creates no explicit necessity to apply the TS ...
... Although TSs and ASs are conceptually separate, in practice a
standards-track document may combine an AS and one or more related
TSs. For example, Technical Specifications that are developed
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... applicability, e.g., for mail server hosts, often contain within a
single specification all of the relevant AS and TS information. In
such cases, no useful purpose would be served by deliberately
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... such cases, no useful purpose would be served by deliberately
distributing the information among several documents just to preserve
the formal AS/TS distinction. However, a TS that is likely to apply
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... An Internet Standard TS or AS may incorporate an open external
standard by reference. For example, many Internet Standards
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This document and the information contained herein is provided
on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR ...
... AS ...