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Is there a Way to know if an audio element used alternate text?

From: Dan Evans <devans@invores.com>
Date: Tue, 20 Dec 2005 15:27:11 -0500
To: www-voice@w3.org
Message-id: <43A8691F.5030804@invores.com>

In a simple audio element with alternate TTS text, can one determine 
whether the alternate text was spoken?  It seems the spec is silent on 
this, and I have found the question of whether the alternate content is 
evaluated to be interpreter-dependent.  For example:

<var name="ttsfail" expr="false"/>
<audio expr = "vox_file('greeting.wav')">
<value expr="ttsfail = true, ''"/>
Thank you for calling ... Your call is very important to us and may be 
monitored or recorded for training and quality control.
<!--  execute following prompt only if the greeting.wav fetch failed and
       text inside the above audio element was spoken.  greeting.wav
       has a dual language recording, so this provides dual language TTS
       backup.  However, interpreter appears to evaluate inside the audio
       element even if the content is not used -->
<prompt cond="ttsfail" xml:lang="es-MX">
Gracias por llamar ... Su llamada es muy importante para nosotros y 
podrá ser monitoreada o grabada para capacitación y control de calidad.

The question is under what circumstances is the variable ttsfail set to 

Received on Tuesday, 20 December 2005 20:27:33 UTC

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