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WSDL Component Structure

Now let's take a closer look at the interface.

  • An interface operation contains message references and fault references. Message references refer to message exchange patterns . To illustrate: a request/response operation will have two message references, one for the request message, and one for the response message. Fault references in an operation point to fault definitions. In this way, fault definitions are shared among operations.
  • For describing the content of the messages and faults, WSDL contains a section called types that contains data schemas.
  • In XML Schema, the most common language, there are element declarations type definitions . Type definitions describe the inner structure of an element, whereas element declarations give elements their names.
  • Each operation message reference and each fault generally points to a single element declaration. The element declaration describes the body of the message, or the fault details of the fault.


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