Internet Engineering Task Force (IETF) P. Higgs
Request for Comments: 7528 J. Piesing
Category: Informational HbbTV Association
ISSN: 2070-1721 April 2015
A Uniform Resource Name (URN) Namespace
for the Hybrid Broadcast Broadband TV (HbbTV) Association
Abstract
This document describes a Uniform Resource Name (URN) namespace for
the Hybrid Broadcast Broadband TV (HbbTV) Association for naming
persistent resources defined within HbbTV specifications. Example
resources include technical documents and specifications, Extensible
Markup Language (XML) Schemas, classification schemes, XML Document
Type Definitions (DTDs), namespaces, style sheets, media assets, and
other types of resources produced or managed by HbbTV.
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/rfc7528.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. URN Specification for the HbbTV Namespace Identifier (NID) . 3
3. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Namespace Considerations . . . . . . . . . . . . . . . . . . 5
5. Community Considerations . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . 6
8.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
HbbTV (Hybrid Broadcast Broadband TV) is a new industry standard
providing an open and business-neutral technology platform that
seamlessly combines TV services delivered via broadcast with services
delivered via broadband and also enables access to Internet-only
services for consumers using connected TVs and set-top boxes. The
founding members of the HbbTV consortium together with a large group
of supporters jointly developed the HbbTV specification to create a
global standard for hybrid entertainment services. Version 1.2.1 of
this specification was published by ETSI as ETSI TS 102 796 [HbbTV12]
in November 2012.
The HbbTV specification is based on existing standards and web
technologies including the Open IPTV Forum (OIPF), Consumer
Electronics Association (CEA), Digital Video Broadcasting (DVB), and
W3C.
World Wide Web Consortium (W3C). The standard provides the features
and functionality required to deliver feature-rich broadcast and
Internet services. Utilizing standard Internet technology, it
enables rapid application development. It defines minimum
requirements simplifying the implementation in devices and leaving
room for differentiation; this limits the investment required by
consumer electronics manufacturers to build compliant devices. The
HbbTV Association is a pan-European initiative aimed at providing an
alternative to proprietary technologies and delivering an open
platform for broadcasters to deliver value-added on-demand services
to the end consumer.
HbbTV has a wide range of supporters from across the broadcaster and
consumer electronics industries.
HbbTV would like to assign unique, permanent, location-independent
names based on URNs for some resources it produces or manages. These
URNs will be constructed according to the URN syntax defined in
[RFC2141]. This namespace specification is for a formal namespace to
be registered according to the procedures set forth in [RFC3406].
2. URN Specification for the HbbTV Namespace Identifier (NID)
This section provides the information required to register a formal
namespace according to the registration procedure defined in
[RFC3406]. The URNs conform to the syntax defined in [RFC2141].
Namespace ID:
"hbbtv"
Registration Information:
Version: 1
Date: 2014-08-07
Declared registrant of the namespace:
Name: Mr. Peter Macavock
Title: Administrator
Affiliation: HbbTV Association
Address: L'Ancienne-Route 17A, CH-1218 Grand-Saconnex,
Suisse
Switzerland
Phone: + 41 22 717 27 14
Email: info@hbbtv.org
Declaration of structure:
URNs assigned by HbbTV will have the following structure based on
the organizational structure of the resources specified in the
HbbTV specifications:
urn:hbbtv:<NSS>
where the syntax of "<NSS>" is specified in Section 2.2 of the URN
Syntax requirements [RFC2141].
The individual URNs will be assigned by HbbTV through the process
of development of the HbbTV specifications.
Relevant ancillary documentation:
None.
Identifier uniqueness considerations:
HbbTV will establish unique identifiers as appropriate and will
ensure that an assigned string is never reassigned.
Identifier persistence considerations:
HbbTV is committed to maintaining the accessibility and
persistence of all resources that are officially assigned URNs by
the organization. The registration tables and information will be
published and maintained by HbbTV on its web site.
Process of identifier assignment:
The assignment of identifiers is fully controlled and managed by
HbbTV.
Process of identifier resolution:
Not applicable; the "hbbtv" namespace is not listed with a
Resolution Discovery System.
Rules for Lexical Equivalence:
The "<NSS>" is case-insensitive.
Conformance with URN Syntax:
No special considerations.
Validation mechanism:
None specified. URN assignment will be managed completely and
published by HbbTV.
Scope:
Global
3. Examples
The following example of schemas and classification schemes is taken
from the current HbbTV specification [HbbTV12].
urn:hbbtv:dash:profile:isoff-live:2012
The following examples of schemas and classification schemes are
under consideration for inclusion in a future version of the HbbTV
specification currently under development.
urn:hbbtv:sync:timeline:ebu-tt-d
urn:hbbtv:config:oitf:oitfCapabilities:2014-1
4. Namespace Considerations
A unique formal namespace is required by HbbTV in order to specify
how the various existing standards can be linked in order to create a
true end-to-end ecosystem for standards-based IPTV deployments and to
provide the necessary system-wide resources.
URN assignment procedures:
The individual URNs shall be assigned through the process of
development of HbbTV specifications by the Hybrid Broadcast
Broadband TV Association. The latest information about HbbTV-
defined specifications can always be found at the owner's website
at
<https://hbbtv.org/pages/about_hbbtv/specification.php>
URN resolution/delegation:
The resolution and delegation shall be determined through the
process of development of specifications by the HbbTV Association.
Since the implementations envisaged cover a wide range of devices
with quite different access methods and capabilities, no single
resolution or delegation mechanism can be referenced in this
document.
Type of resources to be identified:
Types of resources to be identified include XML schema definition
files, classification schemes, and identification systems defined
and published by HbbTV. These resources being identified
constitute a metadata system to describe digital multimedia
broadcast services or content conveyed as part of such services.
The latest HbbTV-defined specifications can always be found at
<https://hbbtv.org/pages/about_hbbtv/specification.php>
5. Community Considerations
URNs defined by HbbTV will be used by implementers of hybrid
broadcast/broadband systems, services, products, and applications
based on the HbbTV specification. They are an essential component of
the open ecosystem that is being facilitated by HbbTV.
HbbTV specifications are developed through a consensus-based process
by member organizations representing most aspects of the digital
television ecosystem. A full list of HbbTV members can be found at
<http://hbbtv.org/pages/hbbtv_association/members.php>
6. Security Considerations
There are no additional security considerations other than those
normally associated with the use and resolution of URNs in general,
which are described in [RFC1737], [RFC2141], and [RFC3406].
This document registers a namespace for URNs. HbbTV may assign
special meaning to certain of the characters of the Namespace
Specific String (NSS) in its specifications. Any security
consideration resulting from such assignment is outside the scope of
this document.
7. IANA Considerations
This document defines a URN NID registration of "hbbtv". IANA has
included it in the "Uniform Resource Names (URN) Namespaces"
registry.
8. References
8.1. Normative References
[RFC1737] Sollins, K. and L. Masinter, "Functional Requirements for
Uniform Resource Names", RFC 1737, December 1994,
<http://www.rfc-editor.org/info/rfc1737>.
[RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997,
<http://www.rfc-editor.org/info/rfc2141>.
[RFC3406] Daigle, L., van Gulik, D., Iannella, R., and P. Faltstrom,
"Uniform Resource Names (URN) Namespace Definition
Mechanisms", BCP 66, RFC 3406, October 2002,
<http://www.rfc-editor.org/info/rfc3406>.
8.2. Informative References
[HbbTV12] ETSI, "Hybrid Broadcast Broadband TV", ETSI TS 102 796
v1.2.1, November 2012.
Authors' Addresses
Paul Higgs
HbbTV Association
c/o Ericsson Inc, 6 Concourse Parkway, suite 400
Atlanta, GA 30328
United States
Phone: +1-650-580-1731
EMail: paul.higgs@ericsson.com
Jonathan Piesing
HbbTV Association
c/o TP Vision, Pathoekeweg 11
Brugge 8000
Belgium
Phone: +32 484 430 060
EMail: jon.piesing@tpvision.com