WSDL Tutorial
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WSDL portType Element
The <portType> element combines multiple message elements to form a complete oneway or round-trip operation.
For example, a <portType> can combine one request and one response message into a single request/response operation. This is most commonly used in SOAP services. A portType can define multiple operations.
Lets take a piece of code from the Example Session:
<portType name="Hello_PortType">
<operation name="sayHello">
<input message="tns:SayHelloRequest"/>
<output message="tns:SayHelloResponse"/>
</operation>
</portType>
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The portType element defines a single operation, called sayHello.
The operation itself consists of a single input message SayHelloRequest
The operation itself consists of a single output message SayHelloResponse
Patterns of Operation
WSDL supports four basic patterns of operation:
One-way : The service receives a message. The operation therefore has a single input element. The grammar for a one-way operation is:
<wsdl:definitions .... > <wsdl:portType .... > *
<wsdl:operation name="nmtoken">
<wsdl:input name="nmtoken"? message="qname"/>
</wsdl:operation>
</wsdl:portType >
</wsdl:definitions>
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Request-response: The service receives a message and sends a response. The operation therefore has one input element, followed by one output element. To encapsulate errors, an optional fault element can also be specified. The grammar for a request-response operation is:
<wsdl:definitions .... >
<wsdl:portType .... > *
<wsdl:operation name="nmtoken" parameterOrder="nmtokens">
<wsdl:input name="nmtoken"? message="qname"/>
<wsdl:output name="nmtoken"? message="qname"/>
<wsdl:fault name="nmtoken" message="qname"/>*
</wsdl:operation>
</wsdl:portType >
</wsdl:definitions>
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Solicit-response: The service sends a message and receives a response. The operation therefore has one output element, followed by one input element. To encapsulate errors, an optional fault element can also be specified. The grammar for a solicit-response operation is:
<wsdl:definitions .... >
<wsdl:portType .... > *
<wsdl:operation name="nmtoken" parameterOrder="nmtokens">
<wsdl:output name="nmtoken"? message="qname"/>
<wsdl:input name="nmtoken"? message="qname"/>
<wsdl:fault name="nmtoken" message="qname"/>*
</wsdl:operation>
</wsdl:portType >
</wsdl:definitions>
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Notification : The service sends a message. The operation therefore has a single output element. Following is the grammer for a notification operation:
<wsdl:definitions .... >
<wsdl:portType .... > *
<wsdl:operation name="nmtoken">
<wsdl:output name="nmtoken"? message="qname"/>
</wsdl:operation>
</wsdl:portType >
</wsdl:definitions>
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