Справочник по SOAP — Структура WSDL 1.1

<definitions targetNamespace="http://example.com/">
  <types> <!-- XSD-схемы типов -->
    <xsd:schema>...</xsd:schema>
  </types>
  
  <message name="GetUserRequest">
    <part name="parameters" element="tns:GetUser"/>
  </message>

  <portType name="UserServicePortType">
    <operation name="GetUser">
      <input message="tns:GetUserRequest"/>
      <output message="tns:GetUserResponse"/>
    </operation>
  </portType>

  <binding name="UserServiceBinding" type="tns:UserServicePortType">
    <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
    <operation name="GetUser">
      <soap:operation soapAction="http://example.com/GetUser"/>
      <input>
        <soap:body use="literal"/>
      </input>
      <output>
        <soap:body use="literal"/>
      </output>
    </operation>
  </binding>

  <service name="UserService">
    <port name="UserServicePort" binding="tns:UserServiceBinding">
      <soap:address location="https://api.example.com/user"/>
    </port>
  </service>
</definitions>