proposed media type registration: application/ssml+xml
Max Froumentin
mf at w3.org
Wed Dec 10 17:41:40 CET 2003
Hi,
Please consider the attached Internet Draft submission: "The
application/ssml+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-ssml-media-type.txt December 2003
The application/ssml+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
working documents of the Internet Engineering Task Force (IETF),
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Abstract
This document specifies the Media Type for the W3C Speech Synthesis
Markup Language (SSML). Speech Synthesis Markup Language is an XML
based markup language for assisting the generation of synthetic
speech in web and other applications. The essential role of SSML
is to give authors of synthesizable content a standard way to
control aspects of speech output such as pronunciation, volume,
pitch, rate and etc. across different synthesis-capable platforms.
Expires: June 2004
1. Introduction
The World Wide Web Consortium has issued a specification [SSML]
defining the Speech Synthesis Markup Language (SSML). This memo
provides information about the application/ssml+xml Media Type,
intended to be used for transferring SSML 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/ssml+xml
MIME media type name: application
MIME subtype name: ssml+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:
SSML [SSML] specifies user agent conformance rules that
dictate behaviour that must be followed when dealing with, among
other things, unrecognized elements.
Published specification:
SSML is now defined as a W3C specification; the latest
published versions is at [SSML].
Applications which use this media type:
Some content authors have already begun hand and tool authoring
on the Web with SSML. 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 SSML 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 SSML files. However, Section 5 below gives some
guidelines for recognizing SSML files. See also section 3.1 in
[XMLMIME].
File extension:
There most common file extension that is currently in use
for SSML is ".ssml".
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 SSML 1.0 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 SSML content being XML, it has the same
considerations when sent as 'application/ssml+xml' as does XML.
See [XMLMIME], section 3.2.
4. Recognizing SSML files
All SSML documents will have the string "<speak" 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 SSML
document.
5. Charset default rules
By virtue of all SSML content being XML, it has the same
considerations when sent as 'application/ssml+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/ssml+xml'.
In addition, several SSML 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 SSML
defines, it is possible that 'application/ssml+xml' may describe
content that has security implications beyond those described here.
However, if the user agent follows the user agent conformance rules
in [SSML], 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
[SSML] "Speech Synthesis Markup Language Version 1.0",
W3C Working Draft (work in progress), December 2002 2001.
Available at <http://www.w3.org/TR/speech-synthesis/>.
[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.
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works. However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Acknowledgement
Funding for the RFC Editor function is currently provided by the
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