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The following diagram shows the relevant OpenNCP classes and the classes that are country-specific.

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Injection of the National implementation classes is handled by a ServiceLoader.  The ServiceLoader will locate and load a specific implementation (called a Service Provider) of an interface.  The ServiceLoader is included in Java SE6 and is already utilized in OpenNCP.

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Here is an example that shows the ServiceLoader in action.  Here you can see how an implementation of the PatientSearchInterface is loaded.

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