Same signature operations in WSDL

[Timour Mouratov]

I have a simple question but  I couldn't find an answer on w3.org. 

Can I define  an operations  in WSDL  with same name and identical
signatures. like this:
  
<message name="req">
        <part name="str"     type="xs:string"/>
</message>  
<message name="empty"/>

<portType name="Test">
      <operation name="op1">
         <input  name="request"     message="tns:req"/>
         <output name="response"    message="tns:empty"/>
      </operation>
      <operation name="op2">
         <input  name="request"     message="tns:req"/>
         <output name="response"    message="tns:empty"/>
      </operation>      
</portType>

When I generate the stubs and deploy the service , axis  always calls
op1 never op2. Is it legitimate from WSDL  specification point of
view?

Best regards,
Timour