Internet Engineering Task Force (IETF) P. Lemieux
Request for Comments: 7972 Sandflow Consulting LLC
Obsoletes: 7302 September 2016
Category: Informational
ISSN: 2070-1721
Entertainment Identifier Registry (EIDR) URN Namespace Definition
Abstract
Entertainment Identifier Registry (EIDR) Identifiers are used for the
globally unique identification of motion picture and television
content. This document defines the formal Uniform Resource Name
(URN) Namespace Identifier (NID) for EIDR Identifiers.
This document obsoletes RFC 7302.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7972.
Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Completed URN Namespace Definition Template . . . . . . . . . 3
3. Namespace Considerations . . . . . . . . . . . . . . . . . . 6
4. Community Considerations . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
6. Security Considerations . . . . . . . . . . . . . . . . . . . 7
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . 8
Appendix A. Summary of Changes (Informative) . . . . . . . . . . 9
A.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 9
A.2. Changes from RFC 7302 . . . . . . . . . . . . . . . . . . 9
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
This document defines the formal Uniform Resource Name (URN)
Namespace Identifier (NID) for EIDR Identifiers. This document
obsoletes RFC 7302. See Appendix A for a summary of changes.
EIDR Identifiers are centrally registered, globally unique
identifiers for audiovisual works and their variants, primarily film
and television. A unique set of metadata parameters describing the
associated work is bound to the EIDR Identifier at the time of
registration.
EIDR Identifiers are a special kind of DOI Name allocated by EIDR
Association specifically for audiovisual works. The Digital Object
Identifier (DOI) system provides an infrastructure for persistent
unique identification of objects of any type and is specified in
[ISO26234]. A DOI Name is the identifier that is permanently
assigned to an object. The use of DOI Names ensures persistence,
global uniqueness, and an open resolution infrastructure.
As a DOI Name, an EIDR Identifier has two components: a prefix
assigned exclusively to EIDR Association by the DOI Registration
Authority and a suffix defined by EIDR Association. Currently, EIDR
Identifiers use the prefix "10.5240", but additional prefixes might
be introduced in the future.
The following is an example of an EIDR Identifier in its canonical
representation:
10.5240/7791-8534-2C23-9030-8610-5
where "10.5240" is the prefix and "7791-8534-2C23-9030-8610-5" is the
suffix. The canonical URN representation of the same EIDR Identifier
is:
urn:eidr:10.5240:7791-8534-2C23-9030-8610-5
Note that ":" is used as separator between the prefix and the suffix
since "/" is a URN reserved character.
[EIDR-OVERVIEW] and [EIDR-INTRO] provide additional background
information.
This document obsoletes RFC 7302. See Appendix A for a summary of
changes.
2. Completed URN Namespace Definition Template
The namespace definition according to the template in [RFC3406] is as
follows:
Namespace ID:
eidr
Registration Information:
Version 1
2014-03-03
Declared registrant of the namespace:
Name:
Entertainment Identifier Registry Association
Address:
c/o Alliances Management
544 Hillside Road
Redwood City, CA 94062
USA
Contact:
URL: http://eidr.org/contact/
Email: info@eidr.org
Declaration of syntactic structure:
An EIDR Identifier is a special kind of DOI Name (see [ISO26234])
and, as such, consists of two components: a prefix denoted EIDR-
PREFIX and a suffix denoted EIDR-SUFFIX. The URN representation
URN-EIDR of an EIDR Identifier conforms to the syntax (expressed
using [RFC5234]):
URN-EIDR = "urn:eidr:" EIDR-NSS
EIDR-NSS = EIDR-PREFIX ":" EIDR-SUFFIX
EIDR-PREFIX = 1*EIDR-CHARS
EIDR-SUFFIX = 1*EIDR-CHARS
EIDR-CHARS = ALPHA / DIGIT / "-" / "." / "_"
The only value of EIDR-PREFIX currently in use is "10.5240".
Additional prefix values conforming to the EIDR-PREFIX syntax
might be introduced by EIDR Association in the future. In all
cases, each of these additional prefix values will be associated
with suffix values that conform to a subset of the EIDR-SUFFIX
syntax. These additional prefixes and their corresponding
suffixes will be documented in future revisions to this
registration.
An implementation can process an EIDR-NSS with an unknown prefix
as an opaque string per the "Rules of Lexical Equivalence" below,
and resolve it as a generic DOI Name per the "Process for
identifier resolution" below.
When EIDR-PREFIX is equal to "10.5240", the syntax of EIDR-SUFFIX
is further constrained according to the RP2079-SUFFIX syntax
specified in [SMPTERP2079]:
RP2079-SUFFIX = 5(4HEXDIG "-") CHECK
CHECK = DIGIT / ALPHA
where CHECK is the Mod 37,36 check character as specified in
[ISO7064], computed over the 20 hexadecimal digits HEXDIG of
RP2079-SUFFIX.
EXAMPLE: urn:eidr:10.5240:7791-8534-2C23-9030-8610-5
Relevant ancillary documentation:
[ISO26234] specifies DOI Name syntax and registration.
[SMPTERP2079] specifies the syntax of the EIDR Identifier with the
prefix "10.5240".
Identifier uniqueness considerations:
An EIDR Identifier is a DOI Name. The ISO 26324 Registration
Authority ensures DOI Name uniqueness; therefore, the URN-EIDR
derived from an EIDR Identifier is guaranteed to be unique and
never reassigned.
Furthermore, an EIDR Identifier is associated with a single URN-
EIDR.
Identifier persistence considerations:
An EIDR Identifier is a DOI Name. The ISO 26324 Registration
Authority ensures that a DOI Name remains valid indefinitely;
therefore, the URN-EIDR derived from an EIDR Identifier remains
valid indefinitely.
Process of identifier assignment:
EIDR Association registers each EIDR Identifier with the ISO 26324
Registration Authority.
Entities involved in the motion picture and television industry,
either directly in the production of content or in its
distribution and related services, are eligible to apply for
registrant status. Registrants pay an annual membership fee that
depends on the size of the company.
Process for identifier resolution:
As a DOI Name, the resolution of the EIDR Identifier associated
with an EIDR-NSS is handled by the ISO 26324 Registration
Authority.
The ISO 26324 Registration Authority operates a web service that
allows the EIDR Identifier associated with an EIDR-NSS to be
resolved by issuing an HTTP GET request to the following URI (see
[RFC7231] and [RFC2818]):
"https://doi.org/" URN-EIDR
If the EIDR Identifier exists, then an XML Schema instance
document (see [XMLSchema]) containing metadata associated with the
EIDR Identifier is returned; otherwise, the HTTP status code "404
Not Found" is returned.
EXAMPLE: https://doi.org/urn:eidr:10.5240:7791-8534-2C23-9030-8610-5
NOTE: The web service uses the HTTP Accept header to determine the
format of the response. When using a web browser to access the
resource above, the query string "?locatt=type:Full" is appended
to the URI to explicitly request an XML response.
EIDR Association operates additional services specifically
tailored to EIDR users (see [EIDR-SERVICES] and [DOI-EIDR-PROXY]).
These services include additional features, e.g., the ability to
register EIDR Identifiers and web-based GUI tools.
Rules for Lexical Equivalence:
Lexical equivalence of the URN-EIDR is defined by case-insensitive
string match.
NOTE: The URN-EIDR includes the "urn:eidr:" string, as specified
under "Declaration of syntactic structure".
Conformance with URN Syntax:
As specified above, the syntax of the URN-EIDR is a subset of the
URN syntax specified in [RFC2141].
Validation mechanism:
The validity of an EIDR-NSS can only be guaranteed by completing
the resolution process.
For EIDR-NSS with an EIDR-PREFIX equal to "10.5240", the CHECK
value can be used for integrity checking, as specified above.
Scope:
EIDR Identifiers are centrally registered, globally unique
identifiers for use with audiovisual works worldwide.
3. Namespace Considerations
EIDR Identifiers are intended for use in Internet applications, where
URNs are routinely used to identify audiovisual resources. There is
no direct mapping from EIDR Identifiers to existing URN namespaces.
4. Community Considerations
The primary registrants of EIDR Identifiers are producers and
distributors of audiovisual works, metadata aggregators, and
audiovisual archives. Any bona fide member of the ecosystem can
become an EIDR member and register any work. EIDR Identifiers can be
used by anyone to unambiguously identify an audiovisual asset and
retrieve underlying metadata. The primary benefits of their use are
associated with works in wide distribution, management of long or
complex distribution chains, and aggregation of information from
multiple sources.
5. IANA Considerations
IANA has registered the Formal URN Namespace 'eidr' in the "Uniform
Resource Names (URN) Namespaces" registry, using the registration
template in Section 2 of this document.
6. Security Considerations
This document specifies the syntax of the URN-EIDR namespace and
makes no security representations. Furthermore, the details of
assignment and resolution processes are defined external to this
document by EIDR Association and the ISO 26324 Registration
Authority, and are thus outside the scope of this document. Note,
however, that failure to conform to the syntactic and lexical
equivalence rules in this specification when using an EIDR Identifier
as a criteria for accessing restricted resources can result in
granting unauthorized access to these resources.
7. References
7.1. Normative References
[ISO26234]
International Organization for Standardization (ISO), "ISO
26324:2012 Information and documentation -- Digital object
identifier system", ISO Standard 26324, June 2012.
[ISO7064] International Organization for Standardization,
"Information technology -- Security techniques -- Check
character systems", ISO Standard 7064, February 2003.
[RFC2141] Moats, R., "URN Syntax", RFC 2141, DOI 10.17487/RFC2141,
May 1997, <http://www.rfc-editor.org/info/rfc2141>.
[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234,
DOI 10.17487/RFC5234, January 2008,
<http://www.rfc-editor.org/info/rfc5234>.
[SMPTERP2079]
Society of Motion Picture and Television Engineers,
"Digital Object Identifier (DOI) Name and Entertainment ID
Registry (EIDR) Identifier Representations",
DOI 10.5594/SMPTE.RP2079.2013, SMPTE RP 2079, 2014.
7.2. Informative References
[DOI-EIDR-PROXY]
Entertainment Identifier Registry Association, "EIDR and
the DOI Proxy", May 2015,
<http://eidr.org/documents/EIDR_and_the_DOI_Proxy.pdf>.
[EIDR-INTRO]
Entertainment Identifier Registry Association, "EIDR: ID
Format Ver. 1.1", August 2013,
<http://eidr.org/documents/EIDR_ID_Format_v1.1.pdf>.
[EIDR-OVERVIEW]
Entertainment Identifier Registry Association, "EIDR
Overview", November 2013, <http://eidr.org/
documents/2013-11-01_EIDR_Overview_FINAL.pdf>.
[EIDR-SERVICES]
Entertainment Identifier Registry Association, "EIDR
System Version 2.0: Registry User's Guide", August 2013,
<http://eidr.org/documents/
EIDR_2.0_Registry_User_Guide.pdf>.
[DOI-EIDR-PROXY]
Entertainment Identifier Registry Association, "EIDR and
the DOI Proxy", May 2015,
<http://eidr.org/documents/EIDR_and_the_DOI_Proxy.pdf>.
[RFC2818] Rescorla, E., "HTTP Over TLS", RFC 2818,
DOI 10.17487/RFC2818, May 2000,
<http://www.rfc-editor.org/info/rfc2818>.
[RFC3406] Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom,
"Uniform Resource Names (URN) Namespace Definition
Mechanisms", BCP 66, RFC 3406, DOI 10.17487/RFC3406,
October 2002, <http://www.rfc-editor.org/info/rfc3406>.
[RFC7231] Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
Protocol (HTTP/1.1): Semantics and Content", RFC 7231,
DOI 10.17487/RFC7231, June 2014,
<http://www.rfc-editor.org/info/rfc7231>.
[rfcdiff] "Rfcdiff Tool", <https://tools.ietf.org/tools/rfcdiff/>.
[XMLSchema]
Holstege, M. and A. Vedamuthu, "W3C XML Schema Definition
Language (XSD): Component Designators", W3C Candidate
Recommendation CR-xmlschema-ref-20100119, January 2010,
<http://www.w3.org/TR/2010/CR-xmlschema-ref-20100119>.
[rfcdiff] "Rfcdiff Tool", <https://tools.ietf.org/tools/rfcdiff/>.
Appendix A. Summary of Changes (Informative)
A.1. Introduction
This Appendix summarizes changes across revisions of this
specification. This summary is informative and not intended to be
exhaustive. Readers seeking a definitive list of changes are instead
encouraged to use tools such as [rfcdiff].
A.2. Changes from RFC 7302
o "Process for identifier resolution" paragraph: The syntax for the
URI supplied to the web service is modified to use (a) the 'https'
scheme and (b) the URN-EIDR representation of the EIDR Identifier.
Author's Address
Pierre-Anthony Lemieux
Sandflow Consulting LLC
Email: pal@sandflow.com