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Logical service interfaces are defined using the WSDL portType element. The portType element is a collection of abstract operation definitions. Each operation is defined by the input, output, and fault messages used to complete the transaction the operation represents. When code is generated to implement the service interface defined by a portType element, each operation is converted into a method containing the parameters defined by the input, output, and fault messages specified in the contract.

To define a logical interface in a WSDL contract you must do the following:

  1. Create a portType element to contain the interface definition and give it a unique name. See Port types.

  2. Create an operation element for each operation defined in the interface. See Operations.

  3. For each operation, specify the messages used to represent the operation’s parameter list, return type, and exceptions. See Operation messages.

Logical operations are made up of a set of elements representing the logical messages communicated between the endpoints to execute the operation. The elements that can describe an operation are listed in Table 5.1.

An operation is required to have at least one input or one output element. An operation can have both input and output elements, but it can only have one of each. Operations are not required to have any fault elements, but can, if required, have any number of fault elements.

The elements have the two attributes listed in Table 5.2.

It is not necessary to specify the name attribute for all input and output elements; WSDL provides a default naming scheme based on the enclosing operation’s name. If only one element is used in the operation, the element name defaults to the name of the operation. If both an input and an output element are used, the element name defaults to the name of the operation with either Request or Response respectively appended to the name.

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