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# WSDL Document Example

Following is the WSDL file that is provided to demonstrate a simple WSDL program. Assuming the service provides a single publicly available function, called sayHello. This function expects a single string parameter and returns a single string greeting. For example if you pass the parameter world then service function sayHello returns the greeting, "Hello, world!".

## Content of HelloService.wsdl file

    <definitions name="HelloService"
       targetNamespace="http://www.examples.com/wsdl/HelloService.wsdl"
       xmlns="http://schemas.xmlsoap.org/wsdl/"
       xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
       xmlns:tns="http://www.examples.com/wsdl/HelloService.wsdl"
       xmlns:xsd="http://www.w3.org/2001/XMLSchema">

       <message name="SayHelloRequest">
          <part name="firstName" type="xsd:string"/>
       </message>
       <message name="SayHelloResponse">
          <part name="greeting" type="xsd:string"/>
       </message>

       <portType name="Hello_PortType">
          <operation name="sayHello">
             <input message="tns:SayHelloRequest"/>
             <output message="tns:SayHelloResponse"/>
          </operation>
       </portType>

       <binding name="Hello_Binding" type="tns:Hello_PortType">
       <soap:binding style="rpc"
          transport="http://schemas.xmlsoap.org/soap/http"/>
       <operation name="sayHello">
          <soap:operation soapAction="sayHello"/>
          <input>
             <soap:body
                encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
                namespace="urn:examples:helloservice"
                use="encoded"/>
          </input>
          <output>
             <soap:body
                encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"
                namespace="urn:examples:helloservice"
                use="encoded"/>
          </output>
       </operation>
       </binding>

       <service name="Hello_Service">
          <documentation>WSDL File for HelloService</documentation>
          <port binding="tns:Hello_Binding" name="Hello_Port">
             <soap:address
                location="http://www.examples.com/SayHello/">
          </port>
       </service>
    </definitions>

# Analysis of the Example

- Definition : HelloService

- Type : Using built-in data types and they are defined in XMLSchema.

- Message :

  1. sayHelloRequest : firstName parameter
  2. sayHelloresponse: greeting return value

- Port Type: sayHello operation that consists of a request and response service.

- Binding: Direction to use the SOAP HTTP transport protocol.

- Service: Service available at http://www.examples.com/SayHello/.

- Port: Associates the binding with the URI http://www.examples.com/SayHello/ where the running service can be accessed.

A detailed description of these elements is given in subsequent sections of the tutorial.

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