clarification needed on VoiceXML 2.0

Hi,
 
  In voiceXML 2.0 specification in section 2.4 <filled> element it is given that 

" For a <filled> in a form, namelist defaults to the names (explicit and implicit) of the form's input items. A <filled> element in an input item cannot specify a namelist (the namelist in this case is the input item name); if a namelist is specified, then an error.badfetch is thrown by the platform upon encountering the document. Note that control items are not permitted in this list; an error.badfetch is thrown when the document contains a <filled> element with a namelist attribute referencing a control item variable. "

    But if we give an undeclared variable in the namelist, what should be the behaviour of the interpreter? as the specification says that,if no namelist is provided all the form's input item will be selected.But here i am providing a variable which is not declared.

Please let me know whether i need to ignore that variable or throw any error. 
This is not provide in the specification.

script is given below:

<form>

<field name="test">

<prompt bargein="false">Please say the hi or bye</prompt>

<grammar>hi|bye</grammar>

</field>

<filled namelist="test1">

<prompt>pass</prompt>

</filled>

</form>


Waiting for the comments...

Thanks and Regards,
Shiva Kumar

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