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Elements of WSDL In WebServices

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WSDL is extensible that allow description of endpoints and their messages regardless of what the message formats is. Following are the elements of Web Service Description Language:

Message: The XML based definition in WSDL consists of message. It is an abstract definition of the data.

Example

 <message name="HelloRequest">
 <part name="name" type="xsd:string"/>
 </message>
 <message name="HelloResponse">
 <part name="john" type="xsd:string"/>
 </message>

Binding: This element defines port type. It is also called a data format for definning the messages. This element describes how the web service is accessed over the network.

Example

<definitions .... >
 <binding name="booktoken" type="book-name"> 
 <operation name="booktoken"> 
 <input name="booktoken"? > 
 </input>
 <output name="booktoken"? > 
 </output>
 <fault name="booktoken">
 </fault>
 </operation>
 </binding>
</definitions>

PortType: A set of operations supported by one or more endpoints.For example collections of operations for binding element or binding message, such as naming a method, message business process. These collections of operations are called as Interfaces.

Example

<portType name="WebServiceInterface">
 <operation name="Add">
 <input message="y:AddOperation"/>
 <output message="y:ResponseOperation"/>
 </operation>
 <operation name="Multiply">
 <input message="y:MultiplyOperation"/>
 <output message="y:ResponseOperation"/>
 </operation>
 </portType>

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Types: The types element contains data types that exchanged data between the client and the web service.

Example

<types>
 <xs:schema
 xmlns:xs= "http://www.indo.org/XMLSchema"
 targetNamespace= "http://go.com/ServicePage/schema"
 xmlns= "http://go.com/ServicePage/schema">
		<xs:element name="Request"
 type="typeRequest"/>
 <xs:sequence>
 <xs:element name="date" type="xs:date"/>
 </xs:sequence>
	 <xs:element name="Response" type="xs:string"/>
	 <xs:element name="DateError" type="xs:string"/>
	 </xs:schema>
 </types>

Service: The service element contains a URL to the service. For example http://www.go.com/Hello/.

Example

<definitions 
 xmlns="http://www.indo.org/ns/wsdl"
 xmlns:wsoap="http://www.indo.org/ns/wsdl/soap"
 xmlns:sch = "http://go.com/ServicePage/schema"
 targetNamespace= "http://go.com/ServicePage"
 xmlns:y="http://example.org/CoreJava/" 
 xmlns:ns="http://example.org/origin/" >
 <service name="CoreJavaService">
 <port name="CoreJavaEndpoint" binding="y:CoreJavaSoapHttpBinding">
 <soap:address location="http://localhost/r4r.co.in"/>
 </port>
 </service>
</definitions>

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