WSDL architecture

 

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WSDL files are written in XML.

A WSDL file contains the following parts:

• Web service interface definition

  This is part contains the elements, as well as the namespaces.

• Web service implementation

  This part contains the definition of the service and ports.

A WSDL file describes a Web service with the following elements:

 

portType

The description of the operations and associated messages. The portType element defines abstract operations.

<portType name="EightBall">

  <operation name="getAnswer">

    <input message="ebs:IngetAnswerRequest"/>
    <output message="ebs:OutgetAnswerResponse"/>

  </operation>

</portType>

 

message

The description of input and output parameters and return values.

<message name="IngetAnswerRequest">

  <part name="meth2_inType" 
        type="ebs:questionType"/>

</message>

<message name="OutgetAnswerResponse">

  <part name="meth2_outType" 
        type="ebs:answerType"/>

</message>
    

 

types

Schema for describing XML types used in the messages.

<types>

  <xsd:schema targetNamespace="...">

    <xsd:complexType name="questionType">
      <xsd:element name="question" type="string"/>
    </xsd:complexType>

    <xsd:complexType name="answerType">
    ...

</types>

 

binding

Protocol used to access a portType, as well as the data formats for the messages that are defined by a particular portType element.

<binding name="EightBallBinding" type="ebs:EightBall">

  <soap:binding style="rpc" 
                transport="schemas.xmlsoap.org/soap/http">

  <operation name="ebs:getAnswer">

  <soap:operation soapAction="urn:EightBall"/>

    <input>
      <soap:body namespace="urn:EightBall" ... />
    ...

The services and ports define the location of the Web service.

 

Service

Contains the Web service name and a list of ports.

 

Ports

Contain the location of the Web service and the binding used for service access.

<service name="EightBall">

  <port binding="ebs:EightBallBinding" 
        name="EightBallPort">

    <soap:address location="localhost:8080/axis/EightBall"/>
  </port>

</service>
  

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Related concepts

WSDL

 

Related tasks

Develop a WSDL file for JAX-RPC applications
Make deployed Web services application available to clients

 

Related Reference

WSDL architecture