PrintJobAttribute is a tagging interface which a printing attribute
class implements to indicate the attribute describes the status of a Print
Job or some other characteristic of a Print Job. A Print Service
instance adds a number of PrintJobAttributes to a Print Job's attribute set
to report the Print Job's status. If an attribute implements {@link
PrintRequestAttribute PrintRequestAttribute} as well as PrintJobAttribute,
the client may include the attribute in a attribute set to
specify the attribute's value for the Print Job.
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