This attribute specifies the name of the user for accounting
purposes. See xcmJobOriginator, xcmJobOwner, and
xcmJobAuthorizationUserName for additional
user names for other purposes (and whose values may be
different). An agent may return the same value for all four
attributes, if the printer or service does not support all
four concepts.
NOTE: There is no corresponding ISO DPA attribute (but there
should be). Often the xcmJobAuthorizationUserName will be the
same as xcmJobAccountingUserName.