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Keywords: EIDR, Entertainment Identifier Registry, URN
Internet Engineering Task Force (IETF) P. Lemieux
Request for Comments: 7302 Sandflow Consulting LLC
Category: Informational July 2014
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.
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/rfc7302.
Copyright Notice
Copyright (c) 2014 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
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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RFC 7302 EIDR URN Namespace Definition July 2014
1. Introduction
This document defines the formal Uniform Resource Name (URN)
Namespace Identifier (NID) for EIDR Identifiers.
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 Names 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 prefix and suffix since
"/" is a URN reserved character.
[EIDR-OVERVIEW] and [EIDR-INTRO] provide additional background
information.
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RFC 7302 EIDR URN Namespace Definition July 2014
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 / "-" / "." / "_"
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RFC 7302 EIDR URN Namespace Definition July 2014
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 to 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 that 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.
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RFC 7302 EIDR URN Namespace Definition July 2014
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]):
"http://doi.org/" EIDR-PREFIX "/" EIDR-SUFFIX
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: http://doi.org/10.5240/7791-8534-2C23-9030-8610-5
NOTE: At the time of this writing, this service of the ISO 26324
Registration Authority is not available over TLS, and hence the
confidentiality of queries is not protected.
EIDR Association operates additional services specifically
tailored to EIDR users (see [EIDR-SERVICES]). These services
include additional features, e.g., confidential lookup using TLS
and the ability to register EIDR Identifiers.
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RFC 7302 EIDR URN Namespace Definition July 2014
Rules for Lexical Equivalence:
Lexical equivalence of EIDR-URN is defined by case-insensitive
string match.
Conformance with URN Syntax:
As specified above, the syntax of EIDR-URN 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.
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RFC 7302 EIDR URN Namespace Definition July 2014
6. Security Considerations
This document specifies the syntax of the EIDR-URN 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 thus are 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,
"Information and documentation - Digital object identifier
system", ISO Standard 26324, 2012.
[ISO7064] International Organization for Standardization,
"Information technology - Security techniques - Check
character systems", ISO Standard 7064, 2003.
[RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997.
[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008.
[SMPTERP2079]
Society of Motion Picture and Television Engineers,
"Digital Object Identifier (DOI) Name and Entertainment ID
Registry (EIDR) Identifier Representations", SMPTE RP
2079, 2014.
7.2. Informative References
[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>.
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RFC 7302 EIDR URN Namespace Definition July 2014
[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>.
[RFC3406] Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom,
"Uniform Resource Names (URN) Namespace Definition
Mechanisms", BCP 66, RFC 3406, October 2002.
[RFC7231] Fielding, R. and J. Reschke, "Hypertext Transfer Protocol
(HTTP/1.1): Semantics and Content", RFC 7231, June 2014.
[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>.
Author's Address
Pierre-Anthony Lemieux
Sandflow Consulting LLC
EMail: pal@sandflow.com
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