An option list is represented by a set of <option> elements contained in a <field> element. Each <option> element contains PCDATA that is used to generate a speech grammar.


NameData typeDescription



The DTMF sequence for this option. It is equivalent to a simple DTMF <grammar>, and DTMF properties apply to recognition of the sequence.



The string to assign to the field's form item variable when a user selects this option, whether by speech or DTMF.

The default assignment is the CDATA content of the <option> element, with leading and trailing white space removed. If this does not exist, then the DTMF sequence is used instead.



(defaults to “exact”) Accepted values include "exact" and "approximate".

When set to “exact”, the option element's value defines the exact phrase to be recognized.

When set to “approximate”, the option element's value defines an approximate recognition phrase.




<?xml version="1.0"?>
<vxml version="2.0">
    <field name="maincourse">
        Please select an entree.
        For <value expr="_prompt"/>, press <value expr="_dtmf"/> or say <value expr="_prompt"/>.
      <option value="fish" dtmf="1"> swordfish steak </option>
      <option value="beef" dtmf="2"> roast beef </option>
      <option value="chicken" dtmf="3"> frog legs </option>
        You chose <value expr="maincourse"/>.

The output of the above script would be:

Computer: Please select an entree. For swordfish steak, press 1 or say swordfish steak. For roast beef, press 2 or say roast beef. For frog legs, press 3 or say frog legs. Human: <user enters: 1> Computer: You chose fish.

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