鐵觀音

      //

      //   Initialization Phase

     //

     foreach ( <var>, <script> and form item, in document order )

        if ( the element is a <var> )

          Declare the variable, initializing it to the value of

          the "expr" attribute, if any, or else to undefined.

        else if ( the element is a <script> )

          Evaluate the contents of the script if inlined or else

          from the location specified by the "src" attribute.

        else if ( the element is a form item )

          Create a variable from the "name" attribute, if any, or

          else generate an internal name.  Assign to this variable

          the value of the "expr" attribute, if any, or else undefined.

          foreach ( input item and <initial> element )

             Declare a prompt counter and set it to 1.

      if ( user entered this form by speaking to its

            grammar while in a different form)

      {

         Enter the main loop below, but start in

         the process phase, not the select phase:

         we already have a collection to process.

      }

      //

      //   
Main Loop: select next form item and execute it.

      //

      while ( true )

      {

           //

           //   
Select Phase: choose a form item to visit.

           //

          if ( the last main loop iteration ended with a <goto nextitem> )

              Select that next form item.

          else if (there is a form item with an unsatisfied guard condition )

              Select the first such form item in document order.

          else

              Do an <exit/> -- the form is full and specified no transition.

           //

           //   
Collect Phase: execute the selected form item.

           //

          //   Queue up prompts for the form item.

          unless ( the last loop iteration ended with

                     a catch that had no <reprompt>, 

                     and the active dialog was not changed )

          {

                   Select the appropriate prompts for an input item or <initial>.

                   Queue the selected prompts for play prior to the next collect operation.

                   Increment an input item’s or <initial>'s prompt counter.

           }

            // Activate grammars for the form item.

           if ( the form item is modal )

               Set the active grammar set to the form item grammars,

               if any. (Note that some form items, e.g. <block>,

               cannot have any grammars).

           else

               Set the active grammar set to the form item

               grammars and any grammars scoped to the form,

               the current document, and the application root document.

           // Execute the form item.

           if ( a <field> was selected )

                Collect an utterance or an event from the user.

           else if ( a <record> was chosen )

                Collect an utterance (with a name/value pair

                for the recorded bytes) or event from the user.

           else if ( an <object> was chosen )

                Execute the object, setting the <object>' s

                form item variable to the returned ECMAScript value.

          else if ( a <subdialog> was chosen )

                Execute the subdialog, setting the <subdialog>' s

                form item variable to the returned ECMAScript value.

          else if ( a <transfer> was chosen )

                Do the transfer, and (if wait is true) set the

                <transfer> form item variable to the returned

                result status indicator.

          else if ( an <initial> was chosen )

                Collect an utterance or an event from the user.

          else if ( a <block> was chosen )

          {

                Set the block' s form item variable to a defined value.

                Execute the block' s executable context.

          }

          //

          //  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.

         }

         //  Process an utterance spoken to a grammar from this form.

         //  First copy utterance result property values into corresponding

         //  form item variables.

         Clear all "just_filled" flags.

         if ( the grammar is scoped to the field-level ) {

            // This grammar must be enclosed in an input item.  The input item

            //  has an associated ECMAScript variable (referred to here as the input

            //  item variable) and slot name.

            if ( the result is not a structure )

               Copy the result into the input item variable.

            elseif ( a top-level property in the result matches the slot name

                       or the slot name is a dot-separated path matching a

                       subproperty in the result )

               Copy the value of that property into the input item variable.

             else

               Copy the entire result into the input item variable.

             Set this input item's "just_filled" flag.

         }

         else {

               foreach ( property in the user' s utterance )

               {

                  if ( the property matches an input item' s slot name )

                   {

                      Copy the value of that property into the input item' s form item variable.

                      Set the input item' s "just_filled" flag.

                   }

                }

           }

        //  Set all <initial> form item variables if any input items are filled.

         if ( any input item variable is set as a result of the user utterance )

            Set all <initial> form item variables to true.

         // Next execute any <filled> actions triggered by this utterance.

         foreach ( <filled> action in document order )

         {

            // Determine the input item variables the <filled> applies to.

             N = the <filled>' s "namelist" attribute.

            if ( N equals "" )

             {

                 if ( the <filled> is a child of an input item )

                    N = the input item’s form item variable name.

                 else if ( the <filled> is a child of a form )

                    N = the form item variable names of all the input items in that form.

             }

             // Is the <filled> triggered?

             if ( any input item variable in the set N was "just_filled"

                    AND  (  the <filled> mode is "all"

                                AND all variables in N are filled

                                OR the <filled> mode is "any"

                                AND any variables in N are filled) )

                 Execute the <filled> action.

            If an event is thrown during the execution of a <filled>,

               event handler selection starts in the scope of the <filled>,

            which could be an input item or the form itself.

         }

         // If no input item is filled, just continue.

     }

      xsi:schemaLocation="http://www.w3.org/2001/vxml

        http://www.w3.org/TR/voicexml20/vxml.xsd"

      <!DOCTYPE vxml 

             PUBLIC "-//W3C//DTD VOICEXML 2.0//EN"

             "http://www.w3.org/TR/voicexml20/vxml.dtd">

      <?xml version="1.0" encoding="UTF-8"?>

      <vxml version="2.0" xmlns="http://www.w3.org/2001/vxml"

           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

             xsi:schemaLocation="http://www.w3.org/2001/vxml

               http://www.w3.org/TR/voicexml20/vxml.xsd">

        <form>

           <block>hello</block>

        </form>

      </vxml>

      <audio src="greetings.wav">Greetings</audio>

      <field name="lo_fat_meal" type="boolean">

        <prompt>

           Do you want a low fat meal on this flight?

        </prompt>

        <help>

           Low fat means less than 10 grams of fat, and under 250 calories.

       </help>

        <filled>

          <prompt>

             I heard <emphasis><say-as interpret-as="vxml:boolean">

            <value expr="lo_fat_meal"/></say-as></emphasis>.

          </prompt>

       </filled>

      </field>

      <field name="ticket_num" type="digits">

        <prompt>

           Read the 12 digit number from your ticket.

        </prompt>

        <help>The 12 digit number is to the lower left.</help>

        <filled>

          <if cond="ticket_num.length != 12">

            <prompt>

               Sorry, I didn't hear exactly 12 digits.

            </prompt>

            <assign name="ticket_num" expr="undefined"/>

          <else/>

            <prompt>

               I heard <say-as interpret-as="vxml:digits">

               value expr="ticket_num"/></say-as>

            </prompt>

          </if>

       </filled>

      </field>

      <grammar src="builtin:dtmf/boolean?y=7;n=9"/>

      <field type="boolean?y=7;n=9">

        <prompt>

           If this is correct say yes or press seven, if not, say no or press nine.

        </prompt>

       </field>

        <field type="digits?minlength=3;maxlength=5">

          <prompt>Please enter your passcode</prompt>

       </field>

      </field>