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Indicates the prominence or stress with which the enclosed text should be played back by the TTS engine. Currently the emphasis element has no effect on the synthesized speech output.
<emphasis level = "string" />
level
One of the following values:
audio, emphasis, enumerate, foreach, p element, prompt, prosody, s element, voice
audio, break, emphasis, enumerate, mark, phoneme, prosody, say-as, sub, value, voice