Subj: Simple proposal to allow more Job Template attributes to be per-document
From: Tom Hastings
File: per-doc.doc
Date: 9/9/97
The latest draft Model document OPTIONALLY allows 5 job template attributes
to be document attributes when Create-Job/Send-Document and Send-URI
operations are implemented:
document-format
compression
document-k-octets
document-impressions
document-media-sheets
as agreed in Redmond.
See the table in section 4.2 and the list in section 4.4.
The table in section 4.2 is divided into two parts, with the above 5
attributes being last in the table.
I talked with Roger yesterday and we'd like to make the following proposal:
1. We'd like to move the boundary up to include the attributes from "media"
down through "page-range" as well. Thus the following job template
attributes would become optional document attributes along with the above 5:
"media", "number-up", "sides", "printer-resolution", "print-quality" and
"page-range".
The "finishing" and "copies" attributes already have the
"multiple-document-handling attribute to control their semantics, so maybe
they should remain as job level only. Then move them up next to
"multiple-document-handling in section 4.2 so that it will be easier for
readers to understand their interaction.
With the above changes, all of the job template attributes that make sense
for being per-document MAY be supported with Send-Document and Send-URI
operations.
2. Since section 3.3.1.1 indicates that these job template attributes are
OPTIONAL as document attributes, a client needs to be able to tell which are
supported as per-document attributes and which are supported only as job
attributes. Therefore, we propose adding a "document-attributes-supported"
Printer description attribute in which the Printer returns the keyword names
of the Job Template attributes that it supports as document attributes in
the Send-Document and Send-URI operations.
3. We need to clarify what happens when a client supplies a job template
attribute at the job level in a Create-Job operation and then also specifies
the same attribute (with a different value) as a document attribute in the
Send-Document or Send-URI operation. We think that the attribute specified
at the document level should override the value of the attribute specified
at the job level, but only for the documents to which the document attribute
is specified. Thus the job level attribute specifies for any documents that
don't have that attribute specified.
For the three attributes that are counts: "document-k-octets",
"document-impressions", and "document-media-sheets", the value at the job
level, if supplied SHALL be the sum for the entire job, while the value at
the document level, if supplied SHALL be for that document alone. So for
these three (extensive) attributes, the document level doesn't overide the
job level attribute, but, instead complements it.
4. On Get Attributes, we need to clarify that, depending on implemenation,
the Printer MAY either:
(1) factor out common document attributes and report them as job attributes,
instead of document attributes
(2) return all document attributes at the document level, regardless of how
the client has specified them
or
(3) preserve the job versus document attributes as supplied by the client,
since the semantic interpretation of all three representations of a job
SHALL be the same.