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
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.