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The value of this attribute ( along with the value of the next attribute " job-state-reasons " ) is taken from a " snapshot " of the new Job object at some meaningful point in time ( implementation defined ) between when the Printer object receives the Print-Job Request and when the Printer object returns the response . The pthread_mutex_destroy function destroys the mutex object referenced by mutex ; the mutex object becomes , in effect , uninitialised . This sample illustrates some generic framework extension code to customize how the Entity object works so that associated entities can be conditionally refreshed from the database . So we have an event object created by the event , and the event object has many properties about the event . These annotations specify that the Scientist object is the root element , and the Person object is of Xmltype . The two classes used are Scientist and Person , where the Person object is encapsulated in the Scientist object .