Description:
------------
I use the classmap option of the soap client constructed from the WSDL.
In my wsdl file i have a complex type with elements where minOccurs=0 et maxOccurs=1.

When the corresponding class member is null, an empty element is send.
How i can tell the soap client to not send elements when minOccurs=0 and 
the value is NULL?

The webservice server is apache axis

Reproduce code:
---------------
Complex type definition:
<complexType name="SimulateRequest">
  <all>
	<element name="product1Type" type="impl:Product1Type"/>
	<element name="product1BankCardTypeCd" type="impl:Product1BankCardTypeCd" minOccurs="0"/>
  </all>
</complexType>

Php Code to call:
	$simulationRequest[0]->setProduct1Type("CLA");
	$simulationRequest[0]->setProduct1BankCardTypeCd(NULL);

Php class SimulateRequest extract:
        class SimulateRequest{
           private  $product1Type ;
           public  function  getProduct1Type(){
            return $this->product1Type;
           }
           public function setProduct1Type($param){
             $this->product1Type=$param;
           }
           private  $product1BankCardTypeCd ;
           public  function  getProduct1BankCardTypeCd(){
             return $this->product1BankCardTypeCd;
           }
           public function setProduct1BankCardTypeCd($param){
            $this->product1BankCardTypeCd=$param;
           }


Expected result:
----------------
<ns1:simulationRequest>
         <ns1:product1Type>REV</ns1:product1Type>
</ns1:simulationRequest>


Actual result:
--------------
<ns1:simulationRequest>
         <ns1:product1Type>REV</ns1:product1Type>
         <ns1:product1BankCardTypeCd/>
</ns1:simulationRequest>