Brad Porter
Steph Tryphonas
Tellme Networks Inc.
November 15, 2002
The 'application/srgs' Media Type
draft-porter-srgs-media-reg-01.txt
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
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This Internet-Draft will expire on May 14, 2003.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
This document defines the 'application/srgs' media type
for the augmented BNF version of the Speech Recognition Grammar
Specification.
1. Introduction
Speech Recognition Grammar Specification is an augmented BNF based language
which defines syntax for representating grammars for use in speech recognition
so that developers can specify the words and patterns of words to be listened
for by a speech recognizer. The syntax of the grammar format is presented in
two forms, an augmented BNF syntax and an XML syntax. Only the ABNF syntax is
discussed here.
While not an XML syntax itself, the ABNF syntax of the Speech
Recognition Grammar Specification uses the same character set,
encoding, and security considerations already established for XML.
Feedback or discussion about this draft should be directed to the
Voice Browser Working Group public mailing list, www-voice@w3.org
with archives at http://lists.w3.org/Archives/Public/www-voice/.
2. Registration of MIME media type application/srgs
MIME media type name: application
MIME subtype name: srgs
Required parameters: none
Optional parameters:
charset
Except for the different syntactic representation, the ABNF grammar
format follows the character encoding behavior in XML which is
is specified in RFC 3023 [XMLMIME]. ABNF grammar processor must
accept both the UTF-8 and UTF-16 encodings of ISO/IEC 10646. The
ABNF byte order mark follows the XML definition and requirements.
For example, documents encoded in UTF-16 must begin with the byte
order mark.
The character encoding is part of the self-identifying grammar header.
The following is an example of an ABNF self-identifying grammar header
for SRGS with the an optional character encoding.
#ABNF 1.0 ISO-8859-1;
Encoding considerations:
See Section 4 of this document.
Security considerations:
See Section 7 of this document.
Interoperability considerations:
SRGS v1.0 [SRGS1] specifies user agent conformance rules that
dictate behaviour that must be followed when dealing with, among
other things, unrecognized elements.
Published specification:
See [SRGS1].
Applications which use this media type:
Content authors and developers have already begun hand and tool
authoring on the Web with the ABNF form of the Speech Recognition
Grammar Specification v1.0.
Additional information:
Magic number:
The first character of an ABNF document version of SRGS following
must be the "#" symbol. It must be followed immediately
by the exact string "ABNF". Next follows a single space character.
These characters must be encoded using the appropriate document
encoding as specified by the XML byte-order mark.
File extension: .gram
Macintosh File Type code: TEXT
Person & email address to contact for further information:
Steph Tryphonas <s-tryphonas@tellme.com>
Brad Porter <b-porter@tellme.com>
Intended usage: COMMON
Author/Change controller:
The SRGS v1.0 specification is a work product of the World
Wide Web Consortium's Voice Browser Working Group. The W3C has change
control over this specification.
3. Fragment identifiers
For documents labeled as 'application/srgs', the fragment
identifier notation is exactly that for application/xml, as
specified in RFC 3023 [XMLMIME].
4. Encoding considerations
The considerations as specified in RFC 3023 [XMLMIME] also
hold for 'application/srgs'.
5. Recognizing ABNF Speech Recognition Grammar Specification
All ABNF SRGS files must begin with the characters "#ABNF "
encoded in the appropriate document encoding as specified by
the preceding optional XML byte-order mark.
6. Charset default rules
The considerations as specified in RFC 3023 [XMLMIME] also
hold for 'application/srgs'.
7. Security considerations
The considerations as specified in RFC 3023 [XMLMIME] also
hold for 'application/srgs'.
8. Author's Address
Steph Tryphonas
Tellme Networks Inc.
Mountain View, California 94041
phone:+1-650-930-9000
mailto:s-tryphonas@tellme.com
Brad Porter
Tellme Networks Inc.
Mountain View, California 94041
phone:+1-650-930-9000
mailto:b-porter@tellme.com
9. References
[SRGS1] "Speech Recognition Grammar Specification for the W3C Speech
Interface Framework", Working Draft 20 August 2001,
(or <http://www.w3.org/TR/2001/WD-speech-grammar-20010820/>)
[MIME] Freed, N., and Borenstein, N., "Multipurpose Internet Mail
Extensions (MIME) Part Two: Media Types", RFC 2046, November
1996.
[XML] "Extensible Markup Language (XML) 1.0", W3C Recommendation,
February 1998. 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., Kohn, D., "XML Media Types",
RFC 3023, January 2001.
[XMLNAME] Bray, T., Hollander, D. and A. Layman, "Namespaces in XML",
January 1999, <http://www.w3.org/TR/REC-xml-names>.
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