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Matching a choice grammar

From: Puneet Sharma <puneetbs@huawei.com>
Date: Thu, 02 Apr 2009 17:10:10 +0530
To: www-voice@w3.org
Cc: ranjit@hauwei.com
Message-id: <000601c9b387$c81ab480$2201120a@china.huawei.com>
Hi,

 

  I feel there is an ambiguity in behavior of <choice> element.

 

  Consider case, where while recognition in a <form> , <menu
scope="document">'s  choice is matched. Then, I feel there is an ambiguity
about scope of current execution of <choice> element. Specification does not
clarify either it should be <menu> or <form>. 

 

 

Please refer below section of Vxml 2.0  : 

http://www.w3.org/TR/voicexml20/#dmlAFIA

 

           Appendix C - Form Interpretation Algorithm

    //
    // Process Phase: process the resulting utterance or event.
    //
 
    Assign the utterance and other information about the last
    recognition to application.lastresult$.
            // Must have an utterance
 
    if ( the utterance matched a grammar belonging to a <link> )
      If the link specifies an "next" or "expr" attribute,
      transition to that location.  Else if the link specifies an
      "event" or "eventexpr" attribute, generate that event.
 
    else if ( the utterance matched a grammar belonging to a <choice> )
      If the choice specifies an "next" or "expr" attribute,
      transition to that location.  Else if the choice specifies
      an "event" or "eventexpr" attribute, generate that event.
 
    else if ( the utterance matched a grammar from outside the current
              <form> or <menu> )
    {
      Transition to that <form> or <menu>, carrying the utterance
      to the new FIA.
    }

 

        From this I understand that, if <choice> is matched from outside of
<menu> then execute <choice> without any transition to that <menu>, so it is
not clear that in which scope  event thrown by such <choice> element should
be handled.

          If it is <menu> then above specified algorithm does not allow that
because that grammar is from <choice>, and if it is <form>  then <form> will
be executing <filled> from some other scope which is not right to do.

 

    Please also clarify below points also considering above scenarios:

   Specification:  A menu can be viewed as a form containing a single field
whose grammar and whose <filled> action are constructed from the <choice>
elements. 

 

        This statement says that, <choice> is treated as <menu>/<form> level
grammar and  but <menu> can  specify scope attribute  which means <choice>
can be matched at global scope.   

 

Regards

Puneet 

 

 
Received on Monday, 6 April 2009 09:26:05 GMT

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