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Re: Proposed Namespace for the Digital Video Broadcasting Project (DVB)
Dear Leslie,
On 2007-11-09 15:42 -0500 Leslie Daigle <leslie at thinkingcat.com> wrote:
> Sigh. Sorry -- this is a little beyond the 2-week window,
> but the points are rather important.
Never mind. I'm grateful for all hints that help to improve my I-D. And
for individual submissions the review window is 4 weeks anyway AFAIK.
> This document (or, rather, the current -01 version) is
> extremely light in the Namespace Considerations and
> Community Considerations sections.
>
> Namespace Considerations should have sentences that explain
> why no existing URN namespace is adequate, and a new
> formal NID should be assigned. (I can infer an answer
> from the text you have there, but the document really ought
> to be explicit).
>
> Community Considerations should make it clear why
> this needs to be a formal URN namespace: what does the
> Internet community at large gain from having this
> namespace registered? Who, outside the DVB immediate
> community, will benefit from this? Benefits can include
> ability to reference DVB xml fragments in standards
> worldwide. It doesn't have to solve world hunger ;-)
> but it should be clear to the reader that this is
> relevant beyond a closed community.
> [...]
I extended both sections based on your suggestions. Please find rev. 02
attached. I hope to have met your expectations.
I also submitted the new rev. to the IETF secretariat, so it should be
on-line soon.
Should you have further comments, please let me know.
Thanks a lot in advance and cheers,
--alexander adolf
Micronas GmbH
Company Headquarters / Sitz der Gesellschaft: Freiburg i. Br. - Municipal Court of / Amtsgericht: Freiburg i. Br. HRB 428. VAT ID / USt-IdNr.: DE 811127087
Management / Geschaftsfuhrung: Dr. Wolfgang Kalsbach, Chairman / Vorsitzender, Hans-Jurgen Desor, Klaus Heberle,
Nikolaus V. Kaeppeler, Wilfried Lowinski, Dirk Wieberneit - Chairman of Supervisory Board / Vorsitzender des Aufsichtsrats: Heinrich W. Kreutzer
Internet Draft A. Adolf
<draft-adolf-dvb-urn-02.txt> Micronas GmbH
Category: Informational P. MacAvock
Expires January 2008 DVB Project
July 12, 2007
A Uniform Resource Name (URN) Namespace for
the Digital Video Broadcasting Project (DVB)
<draft-adolf-dvb-urn-02.txt>
Status of this Memo
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Abstract
This document describes a Uniform Resource Name (URN) namespace for
the Digital Video Broadcasting Project (DVB) for naming persistent
resources defined within DVB standards. 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 DVB.
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Table of Contents
1. Introduction ....................................................2
2. Specification Template ..........................................2
3. Examples ........................................................4
4. Namespace Considerations ........................................4
5. Community Considerations ........................................6
6. Security Considerations .........................................7
7. IANA Considerations .............................................7
8. References ......................................................8
1. Introduction
The Digital Video Broadcasting Project (DVB) is an industry-led
consortium of over 270 broadcasters, manufacturers, network
operators, software developers, regulatory bodies and others in over
35 countries committed to designing global standards for the global
delivery of digital television and data services. Services using DVB
standards are available on every continent with a total of more than
100 million DVB receivers already deployed.
DVB 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 sytax defined in
[RFC2141].
This namespace specification is for a formal namespace to be
registered according to the procedures set forth in [RFC3406].
2. Specification Template
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:
"dvb"
Registration Information:
Version: 1
Date: 2007-02-28
Declared registrant of the namespace:
Name: Peter MacAvock
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Title: Executive Director, DVB Project Office
Affiliation: DVB Digital Video Broadcasting
Address: Ancienne Route 17a
CH-1218 Geneva
SWITZERLAND
Phone: +41 22 717 2719
Email: macavock at dvb.org
Declaration of structure:
URNs assigned by DVB will have the following hierarchical
structure based on the organizational structure of the DVB
standards:
urn:dvb:{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 DVB through the process of
development of DVB standards.
Relevant ancillary documentation:
None
Identifier uniqueness considerations:
DVB will establish unique identifiers as appropriate.
Uniqueness is guaranteed as long as the assigned string is never
reassigned.
Identifier persistence considerations:
DVB is committed to maintaining the accessibility and persistence
of all resources that are officially assigned URNs by the
organization.
Process of identifier assignment:
Assignment is limited to the owner and those authorities that are
specifically designated by the owner. DVB may designate portions
of its namespace for assignment by other parties.
Process of identifier resolution:
The owner will develop and maintain "URN catalogues" that map all
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assigned URNs to Uniform Resource Locators (URLs) specifically to
enable Web-based resolution of named resources. In the future an
interactive online resolution system may be developed to automate
this process. The latest information about DVB defined metadata
can always be found at the owner's website at
http://www.dvb.org/metadata
The owner will authorize additional resolution services as
appropriate.
Rules for Lexical Equivalence:
The "assigned US-ASCII string" is case-insensitive.
Conformance with URN Syntax:
No special considerations.
Validation mechanism:
None specified. The owner will develop and maintain URN
catalogues. The presence of a URN in a catalogue indicates that
it is valid.
Scope:
Global
3. Examples
The following examples are not guaranteed to be real. They are
presented for pedagogical reasons only.
urn:dvb:ipdc:esg:2005
urn:dvb:cs:ZappingTypeCS:2001
4. Namespace Considerations
The urn:dvb namespace is used to identify metadata defined by DVB and
describing DVB multimedia and interactive services. Registration of
urn:dvb as a formal namespace enables use and referencing of DVB XML
fragments in other standards worldwide and enables those standards to
leverage and build upon publicly available DVB metadata schmas and
fragments.
URN assignment procedures:
The individual URNs shall be assigned through the process of
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development of DVB standards by the Digital Video Broadcasting
Project (DVB). The latest information about DVB defined metadata
can always be found at the owner's website at
http://www.dvb.org/metadata
URN resolution/delegation:
The resolution and delegation shall be determined through the
process of development of DVB standards by the Digital Video
Broadcasting Project (DVB).
Currently 3 ways of conveying resolution information are defined
by DVB:
o Repeated, cyclic transmission of Resolution Authority Records
(RAR) and Resolution Records (RR) as auxiliary data in digital
TV broadcast streams over satellite, cable or terrestrial
transmissions according to [EN300468], [EN301192] and
[TS102323].
o Repeated, cyclic multicast transmission of Resolution Records
(RR) via the DVBSTP protocol according to [TS102034].
o Unicast delivery of Resolution Records (RR) in response to
HTTP "GET /dvb/sdns" requests according to [TS102034].
Type of resources to be identified:
Types of resources to be identified include XML schema definition
files, classification schemes and identification systems defined
and openly published by DVB. These resources being identified
constitue a metadata system to describe digital multimedia
broadcast services or content conveyed as part of such services.
The latest DVB defined metadata can always be found at
http://www.dvb.org/metadata
Type of services to be supported:
Types of services supported include controlled term lookup in
classification schemes, resolution of ids in identification
systems.
Concrete examples of these services include digital television
services, (near) video on demand services and digital radio sound
services. Another example are interactive multimedia applications
which are tied to audiovisual content. This might e.g. be a quiz
show where viewers can compete against the contestants on the show
by picking multiple-choce answers with their remote control. These
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end-user services are enabled by the metadata defined under the
urn:dvb namespace.
5. Community Considerations
With the digitisation of the audiovisual broadcasting technologies,
television receiver platforms become quite similar to personal
computer equipment in terms of performance, resources and interfaces.
Hence cross-use of content from the respective other platform (i.e.
TV and PC) becomes interesting to consumres and service providers
alike. Web pages can for instance today be viewed on a general
purpose computer, a set-top box and a mobile phone just the same.
Audio/video broadcasting services are arriving on mobile phones today
("mobile TV"), and efforts are clearly visible to bring such services
to personal computer platforms as well ("IPTV").
Hence cross-linking between these two domains, the Internet/personal
computer doamin and the TV/broadcast domain is called for. Linking
from broadcast domain metadata to Internet-based services is already
enabled through the various established URN and URI schemes
established in the relevant DVB standards ([EN300468], [TS102323] and
[TS102034]). Linking from Internet/web resources to DVB multimedia
services is not yet possible in a well-defined way. Thus a URN scheme
is proposed for DVB defined metadata describing DVB services. As DVB
issues its publications as international standards and has a well-
defined a compliance regime, this request is for a formal namespace.
Open assignment and use of identifiers within the namespace:
With on-going development of DVB standards, DVB will establish
requirements for assignment and use of identifiers within the DVB
namespace. Current identifier assignments can be inferred from the
relevant DVB standards and from http://www.dvb.org/metadata
Open operation of resolution servers for the namespace (server):
With on-going development of DVB standards, DVB will establish
requirements and seek candidates for operating resolution servers
as appropriate.
As set forth in [TS102034], a list of Service Discovery and
Selection (SD&S) entry points addresses can be provided via DNS
based on the service location [RFC2782]. The service name is
"_dvbservdsc", the protocol may be tcp or udp, while the rest of
the name is the domain name maintained by DVB for service
discovery. This domain name is set to "services.dvb.org". The DVB
organization will maintain the services.dvb.org domain name for
service discovery and new service providers should register with
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DVB to add them to the DNS SRV list.
By default, the actual service discovery information is provided
on the IANA registered well-kown dvbservdscport (port number 3937)
via tcp and udp (see http://www.iana.org/assignments/port-
numbers). For multicast delivery of service discovery information,
the IANA registered well-known multicast addresses 224.0.23.14
(DvbServDisc on IPv4) and FF0X:0:0:0:0:0:0:12D (DvbServDisc on
IPv6) are used.
Creation of software that can meaningfully resolve and access
services for the namespace (client):
With on-going development of DVB standards, DVB members will
develop software implementations of its standards for various
platforms. Today, these platforms typically include Open Source
based platforms such as Linux.
As set forth in [TS102034], a list of Service Discovery and
Selection (SD&S) entry points addresses may be acquired via DNS
according to the service location [RFC2782]. The service name is
"_dvbservdsc", the protocol may be tcp or udp, while the rest of
the name is the domain name maintained by DVB for service
discovery. This domain name is set to "services.dvb.org". So the
lookup shall be either "_dvbservdsc._tcp.services.dvb.org" or
"_dvbservdsc._udp.services.dvb.org". This requires that the
terminal support an SRV cognizant DNS client and according to the
specification in [RFC2782]. The DVB organization will maintain the
services.dvb.org domain name for service discovery. HTTP servers
will be found via the tcp protocol method whilst the multicast
addresses will be found via the udp protocol method.
By default, the actual service discovery information can be
obtained from the IANA registered well-kown dvbservdscport (port
number 3937) via tcp and udp (see
http://www.iana.org/assignments/port-numbers). For multicast
delivery of service discovery information, the IANA registered
well-known multicast addresses 224.0.23.14 (DvbServDisc on IPv4)
and FF0X:0:0:0:0:0:0:12D (DvbServDisc on IPv6) can be joined.
6. Security Considerations
There are no additional security considerations other than those
normally associated with the use and resolution of URNs in general.
7. IANA Considerations
This document defines a URN NID registration of "dvb". IANA is
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requested to include it in the URN Namespaces registry.
8. References
8.1. Normative References
[RFC2141] Moats, R., "URN Syntax", RFC 2124, May 1997.
[RFC3406] Daigle, L., van Gulik, D., Iannella, R. and P. Faltstrom,
"Uniform Resource Names (URN) Namespace Definition
Mechanisms", October 2002.
[RFC2782] Gulbrandsen, A., Vixie, P. and L. Esibov, "A DNS RR for
specifying the location of services (DNS SRV)", February
2000
[EN300468] European Telecommunications Standards Institute (ETSI),
"Digital Video Broadcasting (DVB); Specification for
Service Information (SI) in DVB systems", October 2007
[EN301192] European Telecommunications Standards Institute (ETSI),
"Digital Video Broadcasting (DVB); DVB specification for
data broadcasting", November 2004
[TS102323] European Telecommunications Standards Institute (ETSI),
"Digital Video Broadcasting (DVB); Carriage and signalling
of TV-Anytime information in DVB transport streams",
November 2005
[TS102034] European Telecommunications Standards Institute (ETSI),
"Digital Video Broadcasting (DVB); Transport of MPEG-2 TS
Based DVB Services over IP Based Networks", October 2007
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Authors' Addresses
Alexander Adolf
Micronas GmbH
Frankenthalerstrasse 2
D-81539 Munich
GERMANY
Tel: +49 89 54845 7203
Fax: +49 89 54845 7900
EMail: alexander.adolf at micronas.com
Peter MacAvock
DVB Digital Video Broadcasting
Ancienne Route 17a
CH-1218 Geneva
SWITZERLAND
Tel: +41 22 717 2717
EMail: macavock at dvb.org
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