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Abstract

This document defines syntax for representing 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 Form and an XML Form. The specification makes the two representations mappable to allow automatic transformations between the two forms.

Status of this Document

This section describes the status of this document at the time of its publication. Other documents may supersede this document. A list of current W3C publications and the latest revision of this technical report can be found in the W3C technical reports index at http://www.w3.org/TR/.

This document has been reviewed by W3C Members and other interested parties, and it has been endorsed by the Director as a W3C Recommendation. W3C's role in making the Recommendation is to draw attention to the specification and to promote its widespread deployment. This enhances the functionaility and interoperability of the Web.

This specification is part of the W3C Speech Interface Framework and has been developed within the W3C Voice Browser Activity (activity statement) by participants in the Voice Browser Working Group (W3C Members only).

The design of SRGS 1.0 has been widely reviewed (see the disposition of comments) and satisfies the Working Group's technical requirements. A list of implementations is included in the SRGS 1.0 implementation report, along with the associated test suite.

Comments are welcome on www-voice@w3.org (archive). See W3C mailing list and archive usage guidelines.

The W3C maintains a list of any patent disclosures related to this work.

Table of Contents

* 1. Introduction

o 1.1 Grammar Processors and User Agents

o 1.2 Scope

o 1.3 Grammar Conversions

o 1.4 Semantic Interpretation

o 1.5 Embedded Grammars

o 1.6 Terminology

* 2. Rule Expansions

o 2.1 Tokens

o 2.2 Rule References

 2.2.1 Local References

 2.2.2 External Reference by URI

 2.2.3 Special Rules

 2.2.4 Referencing N-gram Documents

o 2.3 Sequences and Encapsulation

o 2.4 Alternatives

 2.4.1 Weights

o 2.5 Repeats

 2.5.1 Repeat Probabilities

o 2.6 Tags

o 2.7 Language

o 2.8 Precedence

* 3. Rule Definitions

o 3.1 Basic Rule Definition

o 3.2 Scoping of Rule Definitions

o 3.3 Example Phrases

* 4. Grammar Documents

o 4.1 Grammar Header Declarations

o 4.2 ABNF Self-Identifying Header

o 4.3 XML Form Prolog and Root Element

o 4.4 Character Encoding

o 4.5 Language

o 4.6 Mode

o 4.7 Root Rule

o 4.8 Tag Format

o 4.9 Base URI

 4.9.1 Resolving Relative URIs

o 4.10 Pronunciation Lexicon

o 4.11 Meta Data

 4.11.1 Meta and HTTP-Equiv

 4.11.2 XML Metadata (XML Only)

o 4.12 Tag

o 4.13 Comments

o 4.14 Grammar Fetching

o 4.15 ABNF Keywords

* 5. Conformance

o 5.1 Conforming XML Form Grammar Fragments

o 5.2 Conforming Stand-Alone XML Form Document

o 5.3 Using XML Form Grammars with other Namespaces

o 5.4 Conforming XML Form Grammar Processors

o 5.5 Conforming Stand-Alone ABNF Form Grammar Documents

o 5.6 Conforming ABNF Form Grammar Processors

o 5.7 Conforming ABNF/XML Form Grammar Processors

o 5.8 Conforming User Agents

* 6. Acknowledgements

* Appendix A. References

o A.1 Normative References

o A.2 Informative References

* Appendix B. DTD for XML Form Grammars (Informative)

* Appendix C. XML Schema Definition For XML Form Grammars (Normative)

* Appendix D. Formal Syntax for Augmented BNF Form Grammars (Normative)

* Appendix E. DTMF Grammars (Normative)

* Appendix F. XSLT Style Sheet to Convert XML Form Grammars to the ABNF Form (Informative)

* Appendix G. Media Types and File Suffix (Informative)

* Appendix H. Logical Parse Structure (Informative)

o H.1 Terminology and Notation

o H.2 Parsing Rule References

o H.3 Recursion

* Appendix I. Features under Consideration for Future Versions (Informative)

* Appendix J. Example Grammars in ABNF Form and XML Form (Informative)

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