Sets a string identifying the media name that is to be
used in place of the currently requested media. The
substitution will continue until another media is
selected. If set to a named media that is not currently
available the requested media is not overridden.
Additional information:
When a request is received to print on a size and
type of media that is not currently available, this
object contains the desired media name as set by the
print job. This object should be set to a media name
that is currently available in the printer. If a
paper mount request is not pending, attempting to get
or set this object will cause
<noSuchName> to be returned.
Setting this object to a string other than one of the
MEDIAn-NAME objects (MEDIA-NAMES-AVAILABLE is applied)
will cause a status of <badValue>
to be returned.