If no impressions are completed, this value shall remain 0.
ISO DPA: Impressions-completed
This attribute indicates the number of impressions that the
printer engine(s) have placed on the media for the job. See the
note in the pages-completed attribute for the relationship of
the pages-completed, impressions-completed and media-sheets-
completed attributes.
The server shall not reset its value during the processing of
multiple copies of documents or the job. Since this attribute
is intended to measure the progress of a job, the value shall
include repeated pages due to multiple copies. When the job
completes, this attribute should contain the value of the total
number of impressions that the printer made for the print-job.
The accuracy of this value is implementation-dependent. It is
expected that the value reported is never greater than the
actual value. This attribute may not be supported for all
printers and all page description languages.
The value of this attribute shall be 0 if printing [processing]
has not started for this job.