Duplicate class while generating artifacts from XSD

Given the following XSDs:

Request.xsd

 <xsd:element name="HelloWorldReqType">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element id="name" name="name" maxOccurs="1" minOccurs="1"/>
    <xsd:element id="gender" name="gender" maxOccurs="1" minOccurs="1"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>

Response.xsd

 <xsd:element name="HelloWorld_response">
  &lt xsd:complexType>
   <xsd:sequence>
    <xsd:element id="greetings" name="greetings" maxOccurs="1" minOccurs="1"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>

I should not explicitly define the same set of request and response elements in WSDL while I have chosen to import them. This is what I did to the WSDL:

  <wsdl:types>
   <xsd:schema targetNamespace="http://www.example.org/HelloWorld/">
     <xsd:import namespace="http://www.example.org/HelloWorldReq" schemaLocation="../resources/HelloWorldReq.xsd"/>
     <xsd:import namespace="http://www.example.org/HelloWorldRes" schemaLocation="../resources/HelloWorldRes.xsd"/>
     <xsd:element name="helloWorld_request">
      <xsd:complexType>
       <xsd:sequence>
        <xsd:element name="name" type="xsd:string" maxOccurs="1" minOccurs="1"/>
        <xsd:element name="gender" type="xsd:string" maxOccurs="1" minOccurs="1"></xsd:element>
       </xsd:sequence>
      </xsd:complexType>
     </xsd:element>
     <xsd:element name="helloWorld_response">
        <xsd:complexType>
          <xsd:sequence>
            <xsd:element name="greetings" type="xsd:string" maxOccurs="1" minOccurs="1"/>
          </xsd:sequence>
        </xsd:complexType>
      </xsd:element>    
    </xsd:schema>
  </wsdl:types>

Line 3 and 4 are the import statement that import the 2 XSDs into WSDL whereas starting from line 5, I define the same set of elements as in the XSDs. Well, this will receive an error complaining duplicate class while generating the JAVA artifact from XSD as shown below:

parsing WSDL...


[ERROR] A class/interface with the same name "org.huahsin.ws.HelloWorldResponse" is already in use. Use a class customization to resolve this conflict.
  line 23 of file:/home/kokhoe/workspace/wsAsync/resources/HelloWorld.wsdl

[ERROR] (Relevant to above error) another "HelloWorldResponse" is generated from here.
  line 8 of file:/home/kokhoe/workspace/wsAsync/resources/HelloWorldRes.xsd

[ERROR] Two declarations cause a collision in the ObjectFactory class.
  line 8 of file:/home/kokhoe/workspace/wsAsync/resources/HelloWorldRes.xsd

[ERROR] (Related to above error) This is the other declaration.   
  line 23 of file:/home/kokhoe/workspace/wsAsync/resources/HelloWorld.wsdl 

Thus experience from here was never be so greedy, choose either site when the element should define.