Internet DRAFT - draft-burnett-rtcweb-constraints-registry
draft-burnett-rtcweb-constraints-registry
RTCWEB D. Burnett
Internet-Draft Tropo
Intended status: Standards Track February 14, 2014
Expires: August 18, 2014
IANA Registry for RTCWeb Constrainable Properties
draft-burnett-rtcweb-constraints-registry-05
Abstract
Specifications in W3C's Media Capture Task Force and WebRTC Working
Group have need of a registry in which to maintain a list of
constrainable properties for HTML media and other constrainable
objects. This document defines this registry.
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 18, 2014.
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.
Burnett Expires August 18, 2014 [Page 1]
Internet-Draft constraints-registry February 2014
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 2
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 2
3.1. RTCWeb Constrainable Properties . . . . . . . . . . . . . 3
3.1.1. Designated Expert Instructions . . . . . . . . . . . 3
4. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.1. Normative References . . . . . . . . . . . . . . . . . . 4
5.2. Informative References . . . . . . . . . . . . . . . . . 4
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
There is currently one W3C specification (Media Capture and Streams
[W3C.WD-mediacapture-streams-20130903]) that has need of a registry
in which to represent constrainable properties, and it is expected
that others will as well. The specification makes use of a data
structure representing a list of constraints on the HTML media or
media connection to be established. Additionally, the specification
defines methods that are used to query the web browser about its
capabilities. The returned data structure specifies the browser's
capabilities in terms of constraints that it can satisfy. The data
structures and their use are defined as the Constrainable interface
in the aforementioned specification. This document specifies the
registry used to define individual constrainable property names,
their allowed values, and their meanings.
2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
3. IANA Considerations
This document defines a registry "RTCWeb Constrainable Properties"
for use by W3C specifications needing to indicate constrainable
properties on HTML Media and other constrainable objects, both as
used by web application authors to indicate preferences and as used
by web browsers to indicate constrainable properties they can
satisfy.
Burnett Expires August 18, 2014 [Page 2]
Internet-Draft constraints-registry February 2014
3.1. RTCWeb Constrainable Properties
IANA SHALL create a new name space of "RTCWeb Constrainable
Properties". All maintenance within and additions to the contents of
this name space MUST be according to the "Specification Required with
Expert Review" registration policy as defined in RFC5226 [RFC5226].
The registry is initially empty. The registry is defined in the
remainder of this section.
Each registry entry consists of a Name and a Reference (or list of
references).
An RTCWeb Constrainable Property Name MUST satisfy the following ABNF
[RFC5234] specification:
rtcweb-constrainable-property = constrainable-property-name
constrainable-property-name = %x41-5A 0*constraint-char
constraint-char = ALPHA / DIGIT
RTCWeb Constrainable Property Names are case-sensitive.
A registration request MUST include the following information:
o The RTCWeb Constrainable Property Name to be registered
o Name and Email address of a contact person for the registration
o Organization or individuals having the change control
o Reference(s) to the specification(s) defining the property
3.1.1. Designated Expert Instructions
RTCWeb Constrainable Property Names are of unlimited length according
to the syntax. However, it is RECOMMENDED that they be no longer
than 80 characters in total. This is to keep them reasonable for
humans to read and use. It is RECOMMENDED that Names use camel case,
i.e., when a Name consists of multiple words, the first character of
each word SHOULD be an uppercase character, with all others being
lowercase.
The references MUST define the following for each RTCWeb
Constrainable Property:
allowed values
Burnett Expires August 18, 2014 [Page 3]
Internet-Draft constraints-registry February 2014
The references MUST define the allowed values for the property,
for example an enumerated list of values or a range of
integers.
object(s)
The references MUST define the object or objects for which the
properties apply, for example a MediaStreamTrack.
The RTCWeb Constrainable Property MUST be well enough defined in the
given references that it is understandable by implementors and
application developers that will use the constraint. The property
SHOULD NOT duplicate a condition that can be achieved using
properties already defined in the registry. The property name SHOULD
be appropriate and specific enough for the property.
4. Security Considerations
Since the constrainable properties envisioned for this registry are
fairly generic in nature, it is not expected that the mere existence
of this registry will introduce any particular security issues. Any
specification defining one or more new properties SHOULD address any
specific security issues that might be introduced by the properties
or their constrainable values.
5. References
5.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
5.2. Informative References
[W3C.WD-mediacapture-streams-20130903]
Burnett, D., Bergkvist, A., Jennings, C., and A.
Narayanan, "Media Capture and Streams", World Wide Web
Consortium WD WD-mediacapture-streams-20130903, September
2013, <http://www.w3.org/TR/2013/
WD-mediacapture-streams-20130903/>.
Burnett Expires August 18, 2014 [Page 4]
Internet-Draft constraints-registry February 2014
Appendix A. Acknowledgements
The authors would like to thank the members of the W3C Media Capture
Task Force and WebRTC Working Group, the members of the IETF RTCWEB
Working Group, and the people who gave specific early review and
feedback: Cullen Jennings and Travis Leithead.
Author's Address
Daniel C. Burnett
Tropo
800 Menlo Ave Suite 210
Menlo Park, CA 94025
USA
Email: dburnett@tropo.com
Burnett Expires August 18, 2014 [Page 5]
