SSML 1.0(W3C Recommendation 7 September 2004)
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SSML 1.1(W3C Recommendation 7 September 2010)
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Common(Not part of SSML standard)
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Amazon Extensions
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Google Extensions
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Notes:
  1. Supported in some locales, but not documented. See https://stackoverflow.com/a/47315662/1405634

Last updated: Sat Aug 17 2019 14:28:32 GMT-0700 (US Mountain Standard Time)