How to set a boolean webservice parameter to null

Hi all,
is it possible to set a boolean input parameter of a webservice to null?
False and true works well, but is there also the posibility of setting it to null?
Greetings
Florian

I will try to explain.
Our webservice has a boolean input parameter. And it acts like the follwing pseudo-code:
IF bool_arg == null
   action1;
ELSE IF bool_arg==false
   action2;
ELSE IF bool_arg==true
   action3;
ENDIF;
With the value NULL i mean that the input paramter is not in the SOAP-XML.
But with Visual Composer i only manage to set the value to true or false.
I cannot find a way to set it to null (which means it is not in the SOAP-XML).
Edited by: Florian Kandlinger on May 27, 2008 12:14 PM

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