The ARK Identifier Scheme
draft-kunze-ark-22

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Network Working Group                                           J. Kunze
Internet-Draft                                California Digital Library
Intended status: Informational                                 E. Bermes
Expires: December 24, 2019              Bibliotheque nationale de France
                                                           June 22, 2019

                       The ARK Identifier Scheme
                           draft-kunze-ark-22

Abstract

   The ARK (Archival Resource Key) naming scheme is designed to
   facilitate the high-quality and persistent identification of
   information objects.  A founding principle of the ARK is that
   persistence is purely a matter of service and is neither inherent in
   an object nor conferred on it by a particular naming syntax.  The
   best that an identifier can do is to lead users to the services that
   support robust reference.  The term ARK itself refers both to the
   scheme and to any single identifier that conforms to it.  An ARK has
   five components:

   [http://NMAH/]ark:[/]NAAN/Name[Qualifier]

   an optional and mutable Name Mapping Authority Hostport (usually a
   hostname), the "ark:" label, the Name Assigning Authority Number
   (NAAN), the assigned Name, and an optional and possibly mutable
   Qualifier supported by the NMA.  The NAAN and Name together form the
   immutable persistent identifier for the object independent of the URL
   hostname.  An ARK is a special kind of URL that connects users to
   three things: the named object, its metadata, and the provider's
   promise about its persistence.  When entered into the location field
   of a Web browser, the ARK leads the user to the named object.  That
   same ARK, inflected by appending a single question mark (`?'),
   returns a brief metadata record that is both human- and machine-
   readable.  When the ARK is inflected by appending dual question marks
   (`??'), the returned metadata contains a commitment statement from
   the current provider.  Tools exist for minting, binding, and
   resolving ARKs.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute

Kunze & Bermes          Expires December 24, 2019               [Page 1]
Internet-Draft                     ARK                         June 2019

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Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
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   to this document.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Reasons to Use ARKs . . . . . . . . . . . . . . . . . . .   4
     1.2.  Three Requirements of ARKs  . . . . . . . . . . . . . . .   5
     1.3.  Organizing Support for ARKs:  Our Stuff vs. Their Stuff .   6
     1.4.  Definition of Identifier  . . . . . . . . . . . . . . . .   7
   2.  ARK Anatomy . . . . . . . . . . . . . . . . . . . . . . . . .   8
     2.1.  The Name Mapping Authority Hostport (NMAH)  . . . . . . .   9
     2.2.  The ARK Label Part (ark:) . . . . . . . . . . . . . . . .  11
     2.3.  The Name Assigning Authority Number (NAAN)  . . . . . . .  11
     2.4.  The Name Part . . . . . . . . . . . . . . . . . . . . . .  12
     2.5.  The Qualifier Part  . . . . . . . . . . . . . . . . . . .  13
       2.5.1.  ARKs that Reveal Object Hierarchy . . . . . . . . . .  14
       2.5.2.  ARKs that Reveal Object Variants  . . . . . . . . . .  15
     2.6.  Character Repertoires . . . . . . . . . . . . . . . . . .  16
     2.7.  Normalization and Lexical Equivalence . . . . . . . . . .  17
   3.  Naming Considerations . . . . . . . . . . . . . . . . . . . .  19
     3.1.  ARKS Embedded in Language . . . . . . . . . . . . . . . .  19
     3.2.  Objects Should Wear Their Identifiers . . . . . . . . . .  19
     3.3.  Names are Political, not Technological  . . . . . . . . .  20
     3.4.  Choosing a Hostname or NMA  . . . . . . . . . . . . . . .  20
     3.5.  Assigners of ARKs . . . . . . . . . . . . . . . . . . . .  22
     3.6.  NAAN Namespace Management . . . . . . . . . . . . . . . .  22
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