Wsdl e request soap with targetNamespace

[Carlo Ponchielli]

<xsd:schema targetNamespace="http://mio_targetNamespace/" ...
<xsd:element name="primoElemento">
<xsd:complexType >
<xsd:sequence>
<xsd:element name="secondoElemento">
<xsd:complexType>
<xsd:sequence >
<xsd:element name="terzoElemento">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="primoElementoSeq" type="xsd:string"/>
<xsd:element name="secondoElementoSeq" type="xsd:string"/>
<xsd:element name="terzoElementoSeq" type="xsd:string"/>
...
...

i have a wsdl file that contains the code above; the java client that i create from this wsdl makes a soap request that, in the first element, contains this code

...
<primoElemento xmlns="http://mio_targetNamespace/">
...

i would like to eliminate the targetNamespace in the first element of the soap request or put "" as value; how can i do? how can i change the .wsdl file?

Thanks and sorry for my bad english