[VXML 2.0] Doubt regarding <clear> namelist token

Hi,

 

I have a doubt regarding the resolution of a variable name present in the namelist attribute of <clear>.

 

Consider the VXML script given below.

 

        <?xml version="1.0"?>

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

          <form>

            <field name="pin" type="digits?length=4">

              <prompt>Enter your 4 digit pin number?</prompt>

              <filled>

                <if cond="pin == 9090">

                    Great! You entered the correct pin number

                <else/>

                    Sorry, Invalid pin - please try again

                    <clear namelist="pin"/>

                </if>                   

              </filled>

            </field>

          </form>

        </vxml>

 

Here, if the user input is not 9090, then the <else> part is executed. In <clear>, the variable name “pin” corresponds to a form-item name (the current one itself). Hence the <field>’s input item variable gets reset to undefined and its prompt counter and event counters get reset (thereby making it eligible for selection in next FIA cycle)

 

Consider the following script with a small modification (A local variable named pin is defined in the anonymous scope of <filled>)

 

        <?xml version="1.0"?>

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

          <form>

            <field name="pin" type="digits?length=4">

              <prompt>Enter your 4 digit pin number?</prompt>

              <filled>

                <if cond="pin == 9090">

                    Great! You entered the correct pin number

                <else/>

                   <var name="pin" expr="’My local pin number’" />

                    Sorry, Invalid pin - please try again

                    <clear namelist="pin"/>

                </if>                   

              </filled>

            </field>

          </form>

        </vxml>

 

During interpretation of this script, if user input is not 9090, then the <else> part is executed. Here <var> declares a new local variable named pin. Now while processing <clear namelist=”pin”>, which variable should get reset – Is it the local variable or the form-item variable?

 

VXML 2.0 specification says, for <clear>, for each specified variable name, the variable is resolved relative to the current scope according to Section 5.1.3 (to remove ambiguity, each variable name in the namelist may be prefixed with a scope name)

 

So I think, in the second script, the local variable pin should get reset. If I need the form-item variable to be reset, I should specify “dialog.pin” in the namelist.

 

Please clarify whether my understanding is correct.

 

Thanks

Rajesh