Problem with the setNillable method in ElementDesc

[Olivier Mocquais]

Hi,
I have generated stubs in order to access to a web service which 
describe the type Person in its WSDL.:

<wsdl:types>
 <schema targetNamespace="http://beans.hello/"; 
xmlns="http://www.w3.org/2001/XMLSchema";>

   <import namespace="http://schemas.xmlsoap.org/soap/encoding/"/>
   <complexType name="Person">
     <sequence>
       <element name="name" nillable="true" type="xsd:string"/>
     </sequence>
   </complexType>
 </schema>
</wsdl:types>
But in the Person class which has been generated, I have 
elemField.setNillable(true);
 static {
     typeDesc.setXmlType(new 
javax.xml.namespace.QName("http://webws.generated/";, "Person"));
     org.apache.axis.description.ElementDesc elemField = new 
org.apache.axis.description.ElementDesc();
     elemField.setFieldName("name");
     elemField.setXmlName(new javax.xml.namespace.QName("", "name"));
     elemField.setXmlType(new 
javax.xml.namespace.QName("http://www.w3.org/2001/XMLSchema";, "string"));
     elemField.setNillable(true);
     typeDesc.addFieldDesc(elemField);
 }

Why can't I find the setNillable method for 
org.apache.axis.description.ElementDesc in elemField.setNillable(true) ?
API: 
http://ws.apache.org/axis/java/apiDocs/org/apache/axis/description/ElementDesc.html 

Server: Axis 1.2RC2, Client: Axis 1.2RC2
Thanks for your answer.
Olivier