Request for Comments: 3380 Xerox Corporation
Updates: 2910, 2911 R. Herriot
Category: Standards Track Consultant
C. Kugler
H. Lewis
IBM Corporation
September 2002
Internet Printing Protocol (IPP):
Job and Printer Set Operations
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
This document is an OPTIONAL extension to the Internet Printing
Protocol (IPP/1.0 and IPP/1.1). This document specifies 3 additional
OPTIONAL operations for use with the Internet Printing Protocol/1.0
(IPP) and IPP/1.1. The end user, operator, and administrator Set-
Job-Attributes and Set-Printer-Attributes operations are used to
modify IPP Job objects and Printer objects, respectively. The Get-
Printer-Supported-Values administrative operation returns values that
the IPP Printer will accept for setting its "xxx-supported"
attributes.
Table of Contents
1 Introduction......................................................4
2 Terminology.......................................................5
2.1 Conformance Terminology.........................................5
2.2 Other terminology...............................................5
3 Requirements and Use Cases........................................5
4 Definition of the Set operations..................................6
4.1 Set-Printer-Attributes Operation................................7
4.1.1 Settable and READ-ONLY Printer Description attributes.........9
4.1.2 Set-Printer-Attributes Request...............................10
4.1.3 Set-Printer-Attributes Response..............................12
4.2 Set-Job-Attributes Operation...................................13
4.2.1 Settable and READ-ONLY Job Description attributes............16
4.2.2 Set-Job-Attributes Request...................................17
4.2.3 Set-Job-Attributes Response..................................18
4.3 Get-Printer-Supported-Values Operation.........................19
4.3.1 Definition of the usage of the 'admin-define' out-of-band
attribute value..............................................20
5 New Operation attributes.........................................22
5.1 printer-message-from-operator (text(127))......................22
5.2 job-message-from-operator (text(127))..........................23
6 New Printer Description Attributes...............................24
6.1 printer-settable-attributes-supported (1setOf type2 keyword)...24
6.2 job-settable-attributes-supported (1setOf type2 keyword).......25
6.3 document-format-varying-attributes (1setOf type2 keyword)......25
6.4 printer-message-time (integer(MIN:MAX))........................25
6.5 printer-message-date-time (dateTime)...........................26
6.6 printer-xri-supported (1setOf collection)......................26
6.7 xri-uri-scheme-supported (1setOf uriScheme)....................28
6.8 xri-authentication-supported (1setOf type2 keyword)............29
6.9 xri-security-supported (1setOf type2 keyword)..................29
7 Additional status codes..........................................29
7.1 client-error-attributes-not-settable (0x0413)..................29
8 Additional out-of-band values....................................30
8.1 'not-settable' out-of-band value...............................30
8.1.1 Encoding of the 'not-settable' out-of-band attribute value...30
8.2 'delete-attribute' out-of-band value...........................30
8.2.1 Encoding of the 'delete-attribute' out-of-band value.........31
8.3 'admin-define' out-of-band attribute value.....................31
8.3.1 Encoding of the 'admin-define' out-of-band attribute value...32
9 New Values for Existing Printer Description Attributes...........33
9.1 operations-supported (1setOf type2 enum).......................33
10 Conformance Requirements........................................33
11 IANA Considerations.............................................34
11.1 Operation Registrations.......................................35
11.2 Additional Enum Attribute Value Registrations for the
"operations-supported" Printer Attribute......................35
11.3 Attribute Registrations.......................................35
11.4 Status code Registrations.....................................36
11.5 Out-of-band Attribute Value Registrations.....................36
12 Internationalization Considerations.............................37
13 Security Considerations.........................................37
14 References......................................................38
14.1 Normative References..........................................38
14.2 Informative References........................................38
Appendix A: Allowed Values for Set-Printer-Attributes and Set-Job-
Attributes requests (Normative)........................39
Appendix B: Attributes returned from Get-Printer-Supported-Values
(Normative)............................................50
Appendix C: Description of the Base IPP Documents (Informative)....55
Authors' Addresses.................................................56
Full Copyright Statement...........................................58
Table of Tables
Table 1 - Operation-Id assignments.................................7
Table 2 - Job State Transition Table for the Set-Job-Attributes
operation ..............................................15
Table 3 - Member attributes of "printer-xri-supported" (1setOf
collection) ............................................27
Table 4 - Operation-id assignments................................33
Table 5 - Validation rules for 'Any of "xxx-supported" '..........40
Table 6 - Validation rules for 'From Get-Printer-Supported-Values'41
Table 7 - Values allowed for Job Template Attributes in the Set-Job-
Attributes Operation ...................................42
Table 8 - Values allowed for Job Description Attributes in the Set-
Job-Attributes Operation ...............................43
Table 9 - Values allowed for Printer Job Template Attributes in the
Set-Printer-Attributes Operation .......................44
Table 10 - Values allowed for Printer Description Attributes in the
Set-Printer-Attributes Operation .......................47
Table 11 - Printer Job Template Attributes returned from Get-Printer-
Supported-Values .......................................51
Table 12 - Printer Job Template Attributes returned from Get-Printer-
Supported-Values .......................................51
Table 13 - Printer Description Attributes returned from Get-Printer-
Supported-Values .......................................51
Table 14 - Printer Job Template Attributes returned from Get-Printer-
Supported-Values .......................................52
Table 15 - Printer Job Template Attributes returned from Get-Printer-
Supported-Values .......................................52
Table 16 - Printer Description Attributes returned from Get-Printer-
Supported-Values .......................................53
1 Introduction
This document is an OPTIONAL extension to IPP/1.0 [RFC2565, RFC2566]
and IPP/1.1 [RFC2911, RFC2910]. For a description of the base IPP
documents see Appendix C.
The Internet Printing Protocol (IPP) is an application level protocol
that can be used for distributed printing using Internet tools and
technologies. IPP version 1.1 [RFC2911, RFC2910] focuses on end user
functionality with a few administrative operations included. This
document defines additional OPTIONAL end user, operator, and
administrator Set-Job-Attributes and Set-Printer-Attributes
operations used to modify IPP Job objects and Printer objects,
respectively. It also defines a third Get-Printer-Supported-Values
administrator operation that returns values that the IPP Printer will
accept for setting its "xxx-supported" attributes. The Get-Printer-
Supported-Values operation MUST be supported, if the implementation
supports setting any "xxx-supported" Printer attributes using the
Set-Printer-Attributes operation.
Nine Printer Description attributes are defined:
printer-settable-attributes-supported (1setOf type2 keyword)
job-settable-attributes-supported (1setOf type2 keyword)
document-format-varying-attributes (1setOf type2 keyword)
printer-message-time (integer(MIN:MAX))
printer-message-date-time (dateTime)
printer-xri-supported (1setOf collection)
xri-uri-scheme-supported (1setOf uriScheme)
xri-authentication-supported (1setOf type2 keyword)
xri-security-supported (1setOf type2 keyword)
Three out-of-band values are defined for use with these three
operations: 'delete-attribute' for deleting Job attributes with the
Set-Job-Attributes request, 'not-settable' for use in either the
Set-Job-Attributes or Set-Printer-Attributes responses, and 'admin-
define' for use in the Get-Printer-Supported-Values response.
Two operation attributes: "printer-message-from-operator" (text) and
"job-message-from-operator" (text) are defined to set the
corresponding IPP/1.1 Printer and Job Description attributes with the
same names. These operation attributes may be used with any
operation that affect the Printer or Job object for which an
operation might want to indicate a message. For the Set-Job-
Attributes and Set-Printer-Attributes operations, the client MUST
explicitly set them, rather than using these operation attributes.
A Printer implementation can make the value of some attributes
dependent on the document-format, e.g., "resolution-supported".
2 Terminology
This section defines terminology used throughout this document.
2.1 Conformance Terminology
Capitalized terms, such as MUST, MUST NOT, REQUIRED, SHOULD, SHOULD
NOT, MAY, NEED NOT, and OPTIONAL, have special meaning relating to
conformance as defined in BCP 14, RFC2119 [RFC2119] and [RFC2911]
section 12.1. If an implementation supports the extension defined in
this document, then these terms apply; otherwise, they do not. These
terms define conformance to this document only; they do not affect
conformance to other documents, unless explicitly stated otherwise.
2.2 Other terminology
This document uses terms such as Job object (or Job), IPP Printer
object (or Printer), "operation", "request", response", "attributes",
"keywords", and "support". These terms have special meaning and are
defined in the model terminology [RFC2911], section 12.2. The
following additional terms are introduced in this document:
READ-ONLY: used in an attribute definition document to indicate that
the attribute MUST NOT be settable using an IPP protocol Set
operation. In other words, the attribute is not settable by
definition.
not-settable: an implementation does not support setting an attribute
(whether or not the attribute's definition is READ-ONLY).
3 Requirements and Use Cases
The following requirements and usage are intended to be met by the
specification in this document.
1. The end-user and the operator need a way to modify a Job that is
in the 'pending' or 'pending-held' state.
Usage: The end-user discovers that he/she forgot to include a
print instruction, such as "finishings" = 'staple' after
submitting a job. Rather than canceling the job and resubmitting
it to the same IPP Printer, the end-user is able to modify the job
on the IPP Printer.
The operator needs to modify a job because it is requesting a
particular kind of media for which there is no more, but the
policy is to print the job on a comparable medium.
2. The system administrator needs a way to re-configure or change the
policy of the IPP Printer remotely.
Usage: The system administrator is adding additional named media
to the supported media list (setting 'name' values to the "media-
supported" Printer attribute).
The system administrator is reducing the capability of the IPP
Printer by removing one of the operations from the supported
operations list, such as Cancel-Job, because the policy is to run
the IPP Printer like a public facsimile machine. After having
removed Cancel-Job from the list of supported operations, an
administrative client needs to be able to display to an
administrator that the implementation is capable of being
reconfigured to support Cancel-Job once again.
The system administrator is remotely configuring the IPP Printer
after installing it, and so is replacing the Printer Description
attributes that have the out-of-band 'no-value' value (see
[RFC2911], section 4.1) with the proper values.
The operator is changing the media loaded in the input tray, and
so is replacing the "media-ready" Job Template Printer attribute
value with the proper values.
4 Definition of the Set operations
The Set-Printer-Attributes operations (as are all Printer operations)
are directed at Printer objects. A client MUST always supply the
"printer-uri" operation attribute in order to identify the correct
target of the operation. These descriptions assume all of the common
semantics of the IPP/1.1 Model and Semantics document [RFC2911],
section 3.1.
The Set-Job-Attributes operations (as are all Job operations) are
directed at Job objects. A client MUST always supply some means of
identifying the Job object in order to identify the correct target of
the operation. That job identification MAY either be a single Job
URI or a combination of a Printer URI with a Job ID, as defined in
[RFC2911]. The IPP object implementation MUST support both forms of
identification for every job. If possible, a client SHOULD use the
Printer URI with a Job ID rather than a Job URI, since the 32-bit
"job-id" is more readily translated to and from other print protocols
that MAY be serving as gateways into or out of the IPP
implementation.
The Set Printer operations are summarized in Table 1:
Table 1 - Operation-Id assignments
Operation Name Operation Brief description
-Id
Set-Printer- 0x0013 Sets attribute values of the target
Attributes Printer object
Set-Job-Attributes 0x0014 Sets attribute values of the target
Job object
Get-Printer- 0x0015 Gets values that are valid for
Supported-Values setting "xxx-supported" attributes
using the Set-Printer-Attributes
operation
4.1 Set-Printer-Attributes Operation
This OPTIONAL operation allows a client to set the values of the
attributes of a Printer object. In the request, the client supplies
the set of Printer keyword attribute names and values that are to be
set. In the response, the Printer object returns success or rejects
the entire request with indications of which attribute or attributes
could not be set.
The Printer object validates the client-supplied attributes in the
Set-Printer-Attributes request. For an attribute to validate, it
MUST meet all of the following rules:
1. The number of attributes supplied by the client MUST NOT exceed
the maximum number that the Printer supports in a Set-Printer-
Attributes request. A Printer MUST accept at least one attribute,
but SHOULD accept a reasonable number in a single Set-Printer-
Attributes request.
Note: There is no way for the client to determine the maximum
number of attributes that the Printer supports in a Set-Printer-
Attributes request, except to try a reasonable number.
2. The Printer MUST support the attribute.
3. The attribute MUST NOT be READ-ONLY, i.e., the definition of the
attribute MUST NOT indicate that the attribute is READ-ONLY (see
Appendix A for an indication of which IPP/1.1 attributes are
READ-ONLY).
4. The attribute MUST be settable in this implementation.
5. The Printer MUST support the value, according to the rules defined
in Appendix A, i.e., each value of each supplied "xxx" attribute
MUST be validated against the value of a corresponding "xxx-
supported" Printer attribute. One of those rules permits an
administrator to set arbitrary 'name' values to those "xxx-
supported" Printer attributes that include the 'name' attribute
syntax if the implementation supports the 'admin-define' out-of-
band value for that "xxx-supported" attribute (see section 8.3 and
Appendix A).
6. The attribute's values MUST NOT conflict with the values of other
Printer attributes, including ones being set in this same
operation.
If any of the supplied attributes are not validate, the Printer
object MUST reject the entire operation; the Printer object MUST NOT
partially set some of the supplied attributes. In other words, after
the operation, all the supplied attributes MUST be set or none of
them MUST be set, thus making the Set-Printer-Attributes an atomic
operation.
The Printer MUST accept this operation when its READ-ONLY "printer-
state" attribute (see [RFC2911], section 4.4.11) is 'idle' or
'stopped', and SHOULD accept it when the value is 'processing'. The
Printer MUST accept this operation for any of the values of the
Printer object's READ-ONLY "printer-state-reasons" and "printer-is-
accepting-jobs" attributes, unless explicitly defined otherwise in
the definition of these attributes' values.
This operation MUST NOT change the value of attributes not specified
in the operation unless the definition of the attribute explicitly
specifies such side-effects. For example, this document explicitly
specifies that when this operation sets "printer-message-from-
operator", the Printer also MUST set the READ-ONLY "printer-message-
time" and READ-ONLY "printer-message-date-time" attributes to the
time of the operation as a side effect. In particular, if this
operation changes an "xxx-default" attribute, the new value MUST be
in the "xxx-supported" attributes or the request MUST contain a new
value for "xxx-supported", which contains the new value for the
"xxx-default". Otherwise, the Printer MUST reject the operation. In
general, Printer attribute definitions that are settable will not
define side-effects on other attributes that are settable, only side
effects on READ-ONLY attributes, if any.
4.1.1 Settable and READ-ONLY Printer Description attributes
If the Printer supports the Set-Printer-Attributes operation, then it
SHOULD support the setting of:
all Job Template Default ("xxx-default") attributes
all Job Template Supported ("xxx-supported") attributes
all Job Template Ready ("xxx-ready") attributes
that the implementation supports (see [RFC2911] section 4.2 and
extensions).
Some Printer Description attributes (see [RFC2911] section 4.4) MUST
NOT be settable, i.e., they are defined to be READ-ONLY. An
attribute marked as "READ-ONLY" in the Printer Description attribute
table in Appendix A is such an attribute. The Printer attributes
that are not marked as "READ-ONLY" MAY be settable using the Set-
Printer-Attributes operation, depending on implementation.
Note: From now on, all extensions that define new object attributes
will indicate whether or not the attributes are READ-ONLY, by
including the "READ-ONLY" adjective in their descriptions and/or
explicitly stating whether they MAY be settable.
The current values of each "xxx-supported" Printer attribute MUST
reflect the current policy for support of the corresponding "xxx"
attribute. If an "xxx-supported" Printer attribute is settable in an
implementation, then its value(s) MUST affect the behavior of the
implementation. If an "xxx-supported" Printer attribute is defined
to be READ-ONLY or is not-settable in an implementation, then its
values MUST NOT be settable using the Set-Printer-Attributes
operation. Consider the following examples:
For example, if the "operations-supported" Printer Description
attribute (see [RFC2911] section 4.4.15) is settable in a
particular implementation, then changing its value with a Set-
Printer-Attributes operation MUST affect the operations that the
implementation accepts or rejects. Such an implementation will
need to be able to reject values for operations that it contains
no code support for (see section 4.3). If the "operations-
supported" Printer Description attribute is not settable in a
particular implementation, then that implementation MUST reject an
attempt to set it with a Set-Printer-Attributes operation, return
the 'client-error-attributes-not-settable' status code (see
section 7.1), and return the "operations-supported" attribute,
with the out-of-band 'not-settable' value in the Unsupported
Attributes Group.
As another example, consider an implementation in which the
"media-default" and "media-supported" are settable. If a client
supplies a Set-Printer-Attributes request that contains the
"media-default" attribute with a value that is not a member of the
Printer's "media-supported" attribute, the Printer MUST reject the
request and return the "client-error-conflicting-attributes"
status code with the "media-default" and "media-supported"
attributes and their values (see [RFC2911] section 3.1.7).
As a third example, if a client supplies a Set-Printer-Attributes
request that contains both the "media-default" and the "media-
supported" attributes, but includes a value in the "media-default"
that is not a member of the supplied "media-supported" attribute,
the Printer MUST reject the request and return the "client-error-
conflicting-attributes" status code with the "media-default" and
"media-supported" attributes and their values (see [RFC2911]
section 3.1.7).
Access Rights: The authenticated user (see [RFC2911] section 8.3)
performing this operation must be an operator or administrator of the
Printer object (see [RFC2911] Sections 1 and 8.5). Most Printer
attributes will require administrator access rights to set, such as
"xxx-supported", while some will require operator access rights only,
such as "media-ready" and "printer-message-from-operator". Which
attributes require which access rights depends on implementation, and
MAY depend on site policy.
4.1.2 Set-Printer-Attributes Request
The following sets of attributes are part of the Set-Printer-
Attributes Request:
Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes, as described in [RFC2911], section 3.1.4.1.
Target:
The "printer-uri" (uri) operation attribute, which is the
target for this operation, as described in [RFC2911], section
3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client, as described in [RFC2911], section 8.3.
"document-format" (mimeMediaType):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. This attribute is useful
for a client to select the document-format to which the
attribute modification should be applied. A Printer
implementation MAY allow some attributes to have different
values for each document format that it supports. See
[RFC2911], section 3.2.5.1 "Get-Printer-Attributes Request".
If the client includes this attribute, the Printer MUST change
the supplied attributes for the document format specified by
this attribute. If a supplied attribute is a member of the
"document-format-varying-attributes" (i.e., the attribute
varies by document format, see section 6.3), the Printer MUST
change the supplied attribute for the document format specified
by this attribute, but not for other document formats. If a
supplied attribute isn't a member of the "document-format-
varying-attributes" (i.e., it doesn't vary by document format),
the Printer MUST change the supplied attribute for all document
formats.
If the client omits this attribute, the Printer MUST change the
supplied attributes for all document formats, whether or not
they vary by document-format.
If the client supplies a value for the "document-format"
Operation attribute, that is either 'application/octet-stream'
or not supported by the Printer, i.e., is not among the values
of the Printer object's "document-format-supported" attribute,
the Printer object MUST reject the operation and return the
'client-error-document-format-not-supported' status code.
Note: the document-format 'application/octet-stream' is the
union of several document-formats (see [RFC2911] section
3.2.5.1, Get-Printer-Attributes) and is not a true document-
format.
Group 2: Printer Attributes
The client MUST supply a set of Printer attributes with one or
more values (including explicitly allowed out-of-band values) as
defined in [RFC2911] section 4.2 Job Template Attributes ("xxx-
default", "xxx-supported", and "xxx-ready" attributes), section
4.4 Printer Description Attributes, and any attribute extensions
supported by the Printer. The value(s) of each Printer attribute
supplied in Group 2 replaces the value(s) of the corresponding
Printer attribute on the target Printer object. For attributes
that can have multiple values (1setOf), all values supplied by the
client replace all values of the corresponding Printer object
attribute. If a Printer object attribute had not yet been
configured, and so assumed the 'no-value' out-of-band value (see
[RFC2911] section 4.1), the supplied value(s) replaces the 'no-
value' value.
4.1.3 Set-Printer-Attributes Response
The Printer object returns the following sets of attributes as part
of the Get-Printer-Attributes Response:
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute, as described in [RFC2911] sections 3.1.6
and 13.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes, as described in [RFC2911], section 3.1.4.2.
Group 2: Unsupported Attributes
See [RFC2911], section 3.1.7, for details on returning Unsupported
Attributes.
If some of the attributes in the operation fail to validate, the
Printer MUST reject the operation, MUST NOT change any Printer
attributes, and MUST return the indicated status code below. In
this group, the Printer MUST also return all attributes that fail
to validate. The following are the reasons that an attribute
fails to validate and the value returns for the attribute, along
with the indicated status code and order of detection:
1. The number of attributes supplied by the client exceeds the
maximum number that the Printer supports in a Set-Printer-
Attributes request: return the 'client-error-request-entity-
too-large' (see [RFC2911], section 13.1.4.9).
2. The Printer doesn't support the attribute: return the attribute
with the "out-of-band" value 'unsupported' (see [RFC2911]
section 3.1.7 and [RFC2910]) and the 'client-error-attributes-
or-values-not-supported (see [RFC2911], section 13.1.4.12).
3. The attribute is either READ-ONLY (in its definition) or is
not-settable in this implementation: return the attribute with
the "out-of-band" value 'not-settable' (see section 8.1) and
the 'client-error-attributes-not-settable' status code (see
section 7.1).
4. The Printer doesn't support the value: if the attribute in the
operation has a single value, return it. If the attribute in
the operation is multi-valued, return only those values in a
1setOf that are not supported. Return the 'client-error-
attributes-or-values-not-supported' status code (see [RFC2911],
section 13.1.4.12).
5. The values of some of the supplied attributes conflict with one
another and/or other Printer attribute values not being set: if
the conflicting attribute in the operation has a single value,
return the attribute and the value. If the attribute in the
operation is multi-valued, return only the attribute and those
values in a 1setOf that are conflicting with other attributes.
Return the 'client-error-conflicting-attributes' status code
(see [RFC2911], section 13.1.4.15).
4.2 Set-Job-Attributes Operation
This OPTIONAL operation allows a client to set the values of the
attributes of a Job object. In the request, the client supplies the
set of Job keyword attribute names and values that are to be set. In
the response, the IPP object returns success or rejects the entire
request with indications of which attribute or attributes could not
be set.
This operation is almost identical to the Set-Printer-Attributes
operation and follows the same rules for validation (see section
4.1). The only differences are that the Set-Job-Attributes operation
is directed at a Job object rather than a Printer object, there is no
"document-format" operation attribute used when setting a Job object,
the operation can add an attribute to the (Job) object, the 'delete-
attributes' out-of-band value is permitted to remove an attribute,
and the validation is the same as the Job Creation operations
(Print-Job, Print-URI, and Create-Job), i.e., depends on the "xxx-
supported" Printer Description attributes (see [RFC2911] section
3.1). Using the Set-Printer-Attributes operation, the administrator
can set arbitrary 'name' values to those "xxx-supported" Printer
attributes, that include the 'name' attribute syntax, if the
implementation supports the 'admin-define' out-of-band value for that
"xxx-supported" attribute (see section 8.3 and Appendix A). However,
the Set-Job-Attributes cannot be used to add unsupported names to the
Job object.
If a client supplies a job attribute in a Set-Job-Attributes request
that the Printer supports, and the job was originally submitted
without supplying that attribute, the Printer adds the attribute to
the Job object.
If the client supplies a job attribute with the "out-of-band" value
'delete-attribute' (see section 8.2), then the Printer MUST remove
the attribute and all of its values from the Job object, if present.
The semantic effect of the client supplying the 'delete-attribute'
value in a Set-Job-Attributes operation MUST be the same as if the
attribute had not been supplied with the Job object in the Job
Creation operation, i.e., the Printer applies its default attribute
or behavior with lower precedence that the PDL (see the beginning of
[RFC2911] section 4.2 and [RFC2911] 3.2.1.1). Any subsequent query
of the Job object using Get-Job-Attributes or Get-Jobs, MUST NOT
return any attribute that has been deleted using the 'delete-
attribute' out-of-band value. However, a client can re-establish
such a deleted Job attribute with any supported value(s), using a
subsequent Set-Job-Attributes operation.
If the client supplies an attribute in a Set-Job-Attributes request
with the 'delete-attribute' value and that attribute is not present
on the Job object, the Printer ignores that supplied attribute in the
request, does not return the attribute in the Unsupported Attributes
group, and returns the 'successful-ok' status code, if there are no
other problems with the request.
The validation of the Set-Job-Attributes request is performed by the
Printer as if the job had been submitted originally with the new
attribute values (and the deleted attributes removed) and with "ipp-
attribute-fidelity" set to 'true', i.e., all modified attributes Job
attributes and values MUST be supported in combination with the Job
attributes not modified. If such a Job Creation operation would have
been accepted, then the Set-Job-Attributes MUST be accepted. If such
a Job Creation operation would have been rejected, then the Set-Job-
Attributes MUST be rejected and the Job MUST be unchanged. In
addition, if any of the supplied attributes are not supported, are
not settable, or the values are not supported, the Printer object
MUST reject the entire operation; the Printer object MUST NOT
partially set some of the supplied attributes. In other words, after
the operation, all the supplied attributes MUST be set or none of
them MUST be set, thus making the Set-Job-Attributes an atomic
operation.
The IPP object MUST accept or reject this operation when the Job's
READ-ONLY "job-state" attribute has the values shown in Table 2. The
job's current state MUST affect whether the IPP object accepts or
rejects the request. For example, in the case where the operation
creates a request for unavailable resources, the Job transitions to a
new state. Table 2 shows the allowed behaviors in each job state and
the transitions.
Table 2 - Job State Transition Table for the Set-Job-Attributes
operation
Current New IPP object's response status code
"job-state" "job-state" and "action":
'pending' 'pending' 'successful-ok'
'pending' 'pending-held' 'successful-ok' - needed resources
are not ready
'pending-held' 'pending-held' 'successful-ok'
'pending-held' 'pending' 'successful-ok' - needed resources
are ready
'processing' 'processing' 'successful-ok' or 'client-error-
not-possible' depending on
implementation, including the
attributes being set, whether the
job has started marking media,
etc.
'processing- 'processing- 'successful-ok' or 'client-error-
stopped' stopped' not-possible' depending on
implementation, including the
attributes being set, whether the
job has started marking media,
etc.
'completed' 'completed' 'client-error-not-possible'
'canceled' 'canceled' 'client-error-not-possible'
'aborted' 'aborted' 'client-error-not-possible'
This operation MUST NOT change the value of attributes not specified
in the operation unless the definition of the attribute explicitly
specifies such side-effects. In general, Job attribute definitions
that are settable will not define side-effects on other attributes
that are settable, only side effects on READ-ONLY attributes, if any.
4.2.1 Settable and READ-ONLY Job Description attributes
If the Printer supports the "job-message-from-operator" Job
Description attribute (see [RFC2911] section 4.3.16) and the client
explicitly supplies a new value for the "job-message-from-operator"
Job Description attribute in Group 2 in the Set-Job-Attributes
request, then the Printer MUST set the "job-message-from-operator"
Job Description attribute to this new value.
If the Printer supports the Set-Job-Attributes operation, then it
SHOULD support the setting of:
all Job Template job ("xxx") attributes
that the implementation supports (see [RFC2911] section 4.2 and
extensions).
Some Job Description attributes (see [RFC2911] section 4.3) MUST NOT
be settable, i.e., they are defined to be READ-ONLY. An attribute
marked as "READ-ONLY" in the Job Description attribute table in
Appendix A is such an attribute. The Job attributes not marked as
"READ-ONLY" MAY be settable using the Set-Job-Attributes operation,
depending on implementation.
Note: From now on, all extensions that define new object attributes
will indicate whether or not the attributes are READ-ONLY, by
including the "READ-ONLY" adjective in their descriptions and/or
explicitly stating whether they MAY be settable.
Access Rights: The authenticated user (see [RFC2911] section 8.3)
performing this operation must either be the job owner (as determined
in the Job Creation operation) or an operator or administrator of the
Printer object (see [RFC2911] Sections 1 and 8.5).
4.2.2 Set-Job-Attributes Request
The following sets of attributes are part of the Set-Job-Attributes
Request:
Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in [RFC2911], section 3.1.4.1.
Target:
Either (1) the "printer-uri" (uri) plus "job-id"
(integer(1:MAX)) or (2) the "job-uri" (uri) operation
attribute(s), which defines the target for this operation as
described in [RFC2911], section 3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client, as described in [RFC2911], section 8.3.
Group 2: Job Attributes
The client MUST supply a set of Job attributes with one or more
values (including explicitly allowed out-of-band values) as
defined in [RFC2911], section 4.2, Job Template Attributes ("xxx"
attributes), section 4.3, Job Description Attributes, and any
attribute extensions supported by the Printer. The value(s) of
each Job attribute supplied in Group 2 replaces the value(s) of
the corresponding Job attribute on the target Job object. For
attributes that can have multiple values (1setOf), all values
supplied by the client replace all values of the corresponding Job
object attribute.
If the client supplies an "xxx" attribute with the 'delete-
attribute' out-of-band value (see section 8.2), the Printer MUST
remove the "xxx" attribute from the Job object, if present.
4.2.3 Set-Job-Attributes Response
The IPP object returns the following sets of attributes as part of
the Set-Job-Attributes Response:
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute as described in [RFC2911], sections 3.1.6
and 13.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in [RFC2911], section 3.1.4.2.
Group 2: Unsupported Attributes
See [RFC2911], section 3.1.7, for details on returning Unsupported
Attributes.
If some of the attributes in the operation fail to validate, the
Printer MUST reject the operation, MUST NOT change any Job
attributes, and MUST return the indicated status code below. In
this group, the Printer MUST also return all attributes that fail
to validate. The following are the reasons that an attribute
fails to validate and the value returns for the attribute, along
with the indicated status code and order of detection:
1. The number of attributes supplied by the client exceeds the
maximum number that the Printer supports in a Set-Printer-
Attributes request: return the 'client-error-request-entity-
too-large' (see [RFC2911], section 13.1.4.9).
2. The Printer doesn't support the attribute: return the attribute
with the 'unsupported' out-of-band attribute value (see
[RFC2911], section 3.1.7 and [RFC2910]) and the 'client-error-
attributes-or-values-not-supported (see [RFC2911], section
13.1.4.12).
3. The attribute is READ-ONLY (in its definition) or is not-
settable in this implementation: return the attribute with the
'not-settable' out-of-band attribute value (see section 8.1)
and the 'client-error-attributes-not-settable' status code (see
section 7.1).
4. The Printer doesn't support the value: if the attribute in the
operation has a single value return it. If the attribute in
the operation is multi-valued, return only those values in a
1setOf that are not supported. Return the 'client-error-
attributes-or-values-not-supported' status code (see [RFC2911],
section 13.1.4.12).
5. The values of some of the supplied attributes conflict with one
another and/or other Job attribute values not being set: if
the conflicting attribute in the operation has a single value,
return the attribute and the value. If the attribute in the
operation is multi-valued, return only the attribute and those
values in a 1setOf that are conflicting with other attributes.
Return the 'client-error-conflicting-attributes' status code
(see [RFC2911],y section 13.1.4.15).
4.3 Get-Printer-Supported-Values Operation
This OPTIONAL operation allows a client to request the values that
the Printer allows in the Set-Printer-Attributes operation for "xxx-
supported" attributes. If the Printer supports the Set-Printer-
Attributes operation AND some of its "xxx-supported" Printer
attributes are settable, then the Printer MUST also support this
operation.
The Printer MUST return in the Get-Printer-Supported-Values response,
those, and only those, "xxx-supported" Printer attributes that it
supports setting with the Set-Printer-Attributes operation.
Furthermore, if a client requests the value of an attribute that is
not settable or is not supported (as in the Get-Printer-Attributes
response), the Unsupported Attributes Group of the response NEED NOT
contain the "requested-attributes" operation attribute with any such
requested (attribute keyword) values.
This operation has identical request/response attributes to the Get-
Printer-Attributes operation in IPP/1.1 [RFC2911]. The operation
also behaves identically to the Get-Printer-Attributes operation in
IPP/1.1 [RFC2911], with the following exceptions:
1. The Get-Printer-Supported-Values operation supports only "xxx-
supported" attributes.
2. The Get-Printer-Attributes operation returns the few "xxx-
supported" attributes that are defined to be single valued, such
as "page-ranges-supported" (boolean) or "pdl-override-supported"
(type2 keyword), as single values, while Get-Printer-Supported-
Values returns the possible values that can be set as a 1setOf of
the same attribute syntax type (See Appendix B: Attributes
returned from Get-Printer-Supported-Values).
3. The Get-Printer-Attributes operation returns the current values of
requested attributes, while the Get-Printer-Supported-Values
operation returns the values that are inherently supported by the
implementation code, i.e., the values that an administrative
client can set in a Set-Printer-Attributes request.
4. The Get-Printer-Attributes operation returns the current values of
requested "xxx-supported" attributes that the Printer is
configured to accept in Job Creation operations, including
additional values defined by the administrator, while the Get-
Printer-Supported-Values operation returns only the values of
"xxx-supported" attributes that are inherently supported by the
implementation and does not return any additional values defined
by the administrator, where the implementation supports the
'admin-define' out-of-band value.
5. The Get-Printer-Attributes never returns the 'admin-define' out-
of-band attribute value, while the Get-Printer-Supported-
Attributes operation does, if the implementation allows the
administrator to define name values by setting that "xxx-
supported" attribute with any 'name' value(s).
6. The Get-Printer-Attributes operation only requires end-user access
rights, while the Get-Printer-Supported-Values requires
administrator access rights.
Access Rights: The authenticated user (see [RFC2911], section 8.3)
performing this operation must be an administrator of the Printer
object (see [RFC2911], Sections 1 and 8.5).
4.3.1 Definition of the usage of the 'admin-define' out-of-band
attribute value
If the Set-Printer-Attributes operation allows the System
Administrator to define arbitrary 'name' values for an "xxx-
supported" attribute, then the Get-Printer-Supported-Values operation
MUST return the 'admin-define' out-of-band attribute value (see
section 8.3) as one of the values of the "xxx-supported" attribute.
In other words, the 'admin-define' out-of-band attribute value