Non WS-I document literal web service

A document literal web service with more than one parts specified for the same message is not WS-I compliant.

e.g.

<wsdl:message name="HelloDudeSoapIn">
      <wsdl:part name="name" element="tns:name"/>
      <wsdl:part name="age" element="tns:age"/>
 </wsdl:message> 

The SOAP message would look like:

<soap-env:envelope>
     <soap-env:body>
              <m:name>Baby</m:name>
              <m:age>1</m:age>
     </soap-env:body>
</soap-env:envelope>  

Why the restriction, think about validation of the message. I would have to extract the name and age elements seperately and then validate them against an XSD. If the elements were within a single tag...

<soap-env:envelope>
     <soap-env:body>
             <m:person>
                    <m:name>Baby</m:name>
                    <m:age>1</m:age>
             </m:person>
     </soap-env:body>
 </soap-env:envelope>  

The person element can be completely validated after the person element is extracted.