Tokens - Amazon Lex

Tokens

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

Token type Example Supported?
Single unquoted token hello Yes
Single unquoted token: non-alphabetic 2 Yes
Single quoted token, no white space "hello" Yes, drop double quotes when it only contains a single token
Two tokens delimited by white space bon voyage Yes
Four tokens delimited by white space this is a test Yes
Single quoted token, including white space "San Francisco No
Single XML token in <token> tag <token>San Francisco</token> No (same as single quoted token with white space)

Notes

  • Single quoted token including white space – The specification requires words enclosed in double quotes be treated as a single token. Amazon Lex V2 treats them as white space delimited tokens.

  • Single XML token in <token> – The specification requires words delimited by <token> to represent one token. Amazon Lex V2 treats them as white space delimited tokens.

  • Amazon Lex V2 throws a validation error when either usage is found in your grammar.

Example

<rule id="state" scope="public">
    <one-of>
        <item>FL</item>
        <item>MA</item>
        <item>NY</item>
    </one-of>
</rule>