Need to understand the reason/cause of Extra / Redundant namespace in SOAP body nodes

I am new at web service implementations, so bear with me if question looks sily.

I am trying to invoke external web service using SOAP message, protocol used in SOAP 1.1 Although i am able to generate SOAP envelope using WSDL and XSD files provided but the outbound SOAP message nodes is generated with extra blank namespaces under

   <soap:body> 

nodes as below -

  <soapenv:Body>
       <urn2:test xmlns:urn2="example.com" xmlns:xsi="http://ift.tt/KyRS61      instance">
          <urn2:node1 xmlns:urn2="">
               <urn2:node2 xmlns:urn2="">25</urn2:node2>

              .... so on ...

          </urn2:node1>
        </urn2:test>
  </soapenv:Body>

I have no clue from where these extra/redundant namespaces are getting generated. And problem is that i don't have access to code which is generating this SOAP envelope to see what's going on.Appreciate quick help on this.