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Defining your schema in a separate file allows you to reuse that file in different scenarios. If you define an AirportCode in a file called airline.xsd, like so:
You can reuse this definition in other schemas, or even WSDL files, using an import statement.
Even though a contract must remain constant for as long as possible, they do need to be changed sometimes. In Java, this typically results in a new Java interface, such as AirlineService2, and a (new) implementation of that interface. Of course, the old service must be kept around, because there might be clients who have not migrated yet.
If using contract-first, we can have a looser coupling between contract and implementation. Such a looser coupling allows us to implement both versions of the contract in one class. We could, for instance, use an XSLT stylesheet to convert any "old-style" messages to the "new-style" messages.
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