Header declarations

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Header declarations - Amazon Lex

The following table shows the header declarations supported by the grammar slot type. For more information, see Grammar header declarations in the Speech recognition grammar specification version 1 W3C recommendation.

Declaration	Specification requirement	XML form	Amazon Lex support	Specification
Grammar version	Required	4.3: `version` attribute on `grammar` element	Required	SRGS
XML namespace	Required (XML only)	4.3: `xmlns` attribute on `grammar` element	Required	SRGS
Document type	Required (XML only)	4.3: XML DOCTYPE	Recommended	SRGS
Character encoding	Recommended	4.4: `encoding` attribute in XML declaration	Recommended	SRGS
Language	Required in voice mode Ignored in DTMF mode	4.5: `xml:lang` attribute on `grammar` element	Required in voice mode Ignored in DTMF mode	SRGS
Mode	Optional	4.6: `mode` attribute on `grammar` element	Optional	SRGS
Root rule	Optional	4.7: `root` attribute on `grammar` element	Required	SRGS
Tag format	Optional	4.8: `tag-format` attribute on `grammar` element	String literal and ECMAScript are supported	SRGS, SISR
Base URI	Optional	4.9: `xml:base` attribute on `grammar` element	Optional	SRGS
Pronunciation lexicon	Optional, multiple allowed	4.10: `lexicon` element	Not supported	SRGS, PLS
Metadata	Optional, multiple allowed	4.11.1: `meta` element	Required	SRGS
XML metadata	Optional, XML only	4.11.2: `metadata` element	Optional	SRGS
Tag	Optional, multiple allowed	4.12: `tag` element	Global tags not supported	SRGS

Example


<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE grammar PUBLIC "-//W3C//DTD GRAMMAR 1.0//EN"
                  "http://www.w3.org/TR/speech-grammar/grammar.dtd">

<grammar xmlns="http://www.w3.org/2001/06/grammar"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xml:base="http://www.example.com/base-file-path"
         xsi:schemaLocation="http://www.w3.org/2001/06/grammar
                             http://www.w3.org/TR/speech-grammar/grammar.xsd"
         xml:lang="en-US"
         version="1.0"
         mode="voice"
         root="city"
         tag-format="semantics/1.0">