<definitions name=”SchoolLibrary” targetNamespace="http://www.school_library.com/Library.wsdl">
  <xmlns:xsd=" http://www.w3.org/2001/XMLSchema ">
 
  <message name="getBookRequest">
       <part name="Title" type="xsd:string"/>
    </message>
    <message name="getBookResponse">
       <part name="return" type="xsd:string"/>
    </message>  
    <interface name=”LibInterface”>
        <operation name="getBook">
            <input message="getBookRequest"/>
            <output message="getBookResponse"/>
        </operation>
    </interface>  
    <service> ...
    </service>    
    <binding> ...
    </binding>  
</definitions>