proposed media type registration: application/voicexml+xml
Max Froumentin
mf at w3.org
Wed Dec 10 15:57:00 CET 2003
Hi,
Please consider the attached Internet Draft submission: "The
application/voicexml+xml Media Type" (originating from the Voice
Browser Working Group of the W3C), for review.
Cheers,
Max Froumentin, W3C
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Network Working Group M. Froumentin
INTERNET DRAFT W3C
draft-froumentin-voicexml-media-type-01.txt December 2003
The application/voicexml+xml Media Type
Status of this Memo
This document is anhttp://www.ietf.org/rfc/rfc2026.txt
Internet-Draft and is subject to all provisions of Section 10 of
RFC2026. http://www.ietf.org/rfc/rfc2026.txt Internet-Drafts are
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Abstract
This document specifies the Media Type for the W3C Voice Extensible
Markup Language (VoiceXML), version 2.0. VoiceXML is an XML markup
language designed for creating audio dialogs that feature
synthesized speech, digitized audio, recognition of spoken and DTMF
key input, recording of spoken input, telephony, and
mixed-initiative conversations.
Expires: June 2004
1. Introduction
The World Wide Web Consortium has issued a specification [VXML]
defining the Voice Extensible Markup Language (VoiceXML), version
2.0. This memo provides information about the
application/voicexml+xml Media Type, intended to be used for
transferring VoiceXML documents.
This document follows the convention set out in [XMLMIME] for the
MIME subtype name; attaching the suffix "+xml" to denote that the
entity being described conforms to the XML syntax as defined in XML
1.0 [XML].
This document was prepared by members of the W3C Voice Browser
working group. Please send comments to www-voice at w3.org, a public
mailing list with archives at
<http://lists.w3.org/Archives/Public/www-voice/>.
2. Registration of MIME media type application/voicexml+xml
MIME media type name: application
MIME subtype name: voicexml+xml
Required parameters: none
Optional parameters: none
Encoding considerations:
See Section 4 of this document.
Security considerations:
See Section 7 of this document.
Interoperability considerations:
VoiceXML [VXML] specifies user agent conformance rules that
dictate behaviour that must be followed when dealing with, among
other things, unrecognized elements.
Published specification:
VoiceXML 2.0 is now defined as a W3C Recommendation; the latest
published versions is at [VoiceXML].
Applications which use this media type:
Some content authors have already begun hand and tool authoring
on the Web with VoiceXML. However that content is currently
described as "text/xml" or "application/xml", allowing existing
Web browsers to process it without reconfiguration for a new
media type.
This new type is being registered in order to allow for the
expected deployment of VoiceXML on the World Wide Web, as a first
class XML application where authors can expect that user agents
are conformant XML 1.0 [XML] processors.
Additional information:
Magic number:
There is no single initial byte sequence that is always present
for VoiceXML files. However, Section 5 below gives some
guidelines for recognizing VoiceXML files. See also section 3.1 in
[XMLMIME].
File extension:
There most common file extension that is currently in use
for VoiceXML is ".vxml".
Macintosh File Type code: TEXT
Person & email address to contact for further information:
Max Froumentin <mf at w3.org>
Intended usage: COMMON
Author/Change controller:
The VoiceXML 2.0 specification is a work product of the World Wide
Web Consortium's Voice Browser Working Group. The W3C has
change control over these specifications.
3. Encoding considerations
By virtue of VoiceXML content being XML, it has the same
considerations when sent as 'application/voicexml+xml' as does XML.
See [XMLMIME], section 3.2.
4. Recognizing VoiceXML files
All VoiceXML documents will have the string "<vxml" near the beginning
of the document. Some will also begin with an XML declaration which
begins with "<?xml", though that alone does not indicate a VoiceXML
document.
5. Charset default rules
By virtue of all VoiceXML content being XML, it has the same
considerations when sent as 'application/voicexml+xml' as does XML
([XMLMIME], section 3.2) in the absence of the charset parameter.
6. Security Considerations
The considerations for 'application/xml' as specified in [XMLMIME],
also hold for 'application/voicexml+xml'.
In addition, several VoiceXML instructions may cause arbitrary URIs
to be dereferenced. In this case, the security issues of RFC1738,
section 6, should be considered.
Furthermore, because of the extensibility features that VoiceXML
defines, it is possible that 'application/voicexml+xml' may describe
content that has security implications beyond those described here.
However, if the user agent follows the user agent conformance rules
in [VXML], this content will be ignored. Only in the case where
the user agent recognizes and processes the additional content, or
where further processing of that content is dispatched to other
processors, would security issues potentially arise. And in that
case, they would fall outside the domain of this registration
document.
7. Author's Address
Max Froumentin
W3C/ERCIM
2004, route des Lucioles - B.P. 93
06902 Sophia Antipolis Cedex
FRANCE
Phone: +33 (0)492387889
Fax:+33 (0)492387822
EMail: mf at w3.org
8. References
[VXML] "Voice Extensible Markup Language (VoiceXML) Version 2.0",
W3C Working Draft (work in progress), October 2001.
Available at <http://www.w3.org/TR/voicexml20/>.
[XML] "Extensible Markup Language (XML) 1.0", W3C
Recommendation. Available at <http://www.w3.org/TR/REC-
xml> (or <http://www.w3.org/TR/2000/REC-xml-20001006>).
[XMLMIME] Murata, M., St.Laurent, S. and D. Kohn, "XML Media
Types", RFC 3023, January 2001.
10. Full Copyright Statement
Copyright (C) The Internet Society (2002). All Rights Reserved.
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included on all such copies and derivative works. However, this
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The limited permissions granted above are perpetual and will not be
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Acknowledgement
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