wdiff draft-ietf-ipp-get-resource-00.txt draft-ietf-ipp-get-resource-01.txt

There (3) issues in this document, each beginning 'ISSUE_n:'.
Internet Printing Protocol Working Group Tom Hastings
INTERNET DRAFT Xerox
Expires 7 January March 2001 Ira McDonald
High North
[Target Category: Standards Track] 7 July September 2000

Internet Printing Protocol (IPP):
Resource Objects and Get Resource Operations
<draft-ietf-ipp-get-resource-00.txt>
<draft-ietf-ipp-get-resource-01.txt>

Status of this Memo

This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its areas,
and its working groups. Note that other groups may also distribute
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Abstract

This document is a submission to the Internet Printing Protocol
Working Group of the Internet Engineering Task Force (IETF). The
open issues in this document each begin 'ISSUE_n:'. Comments should
be submitted to the ipp@pwg.org mailing list.

This IPP Get Resource Objects document specifies an extension to IPP/1.0
[RFC-2565] [RFC-2566] and IPP/1.1 [IPP-MOD] [IPP-PRO]. This document
extends the current closed IPP object model with a passive polymorphic
object that is intended type - Resource - to satisfy most needs for new
object types in support the long-term evolution of IPP via an extensible
object framework. IPP.

This document defines:
- Resource object (passive polymorphic object);
- Resource get query operations (e.g., Get-Resource-Attributes);
- Resource admin operations (e.g., Create-Resource);
- Resource template attributes (e.g., "resource-charset");
- Resource description attributes (e.g., "resource-name"); and
- new Printer attributes (e.g.,
"resource-type-supported"); Resource type of Driver (a morph of the
Resource object); methods for supporting 'driver download' to IPP
Client systems. "resource-type-supported").

Table of Contents

1. Introduction ............................................... 4
2. IPP Model for Resources .................................... 5
2.1. Resource Object ........................................ 5
3. Terminology ................................................ 6
3.1. Conformance Terminology ................................ 6
3.2. Model Terminology ...................................... 6
4. Resource Operations ........................................ 7
4.1. Get-Resource-Attributes Operation Resource Query Package - REQUIRED ...................... 7
4.1.1. Get-Resource-Attributes Operation .................. 7
4.1.1.1. Get-Resource-Attributes Request .................... ................ 8
4.1.2.
4.1.1.2. Get-Resource-Attributes Response ................... ............... 9
4.2.
4.1.2. Get-Resource-Data Operation ............................ ........................ 10
4.2.1.
4.1.2.1. Get-Resource-Data Request .......................... ...................... 10
4.2.2.
4.1.2.2. Get-Resource-Data Response ......................... 10
4.3. ..................... 11
4.1.3. Get-Resources Operation ................................ ............................ 11
4.3.1.
4.1.3.1. Get-Resources Request .............................. 11
4.3.2. .......................... 12
4.1.3.2. Get-Resources Response ............................. 12 ......................... 13
4.2. Resource Admin Package - OPTIONAL ...................... 14
4.2.1. Create-Resource Operation .......................... 14
4.2.1.1. Create-Resource Request ........................ 14
4.2.1.2. Create-Resource Response ....................... 16
4.2.2. Delete-Resource Operation .......................... 17
4.2.2.1. Delete-Resource Request ........................ 17
4.2.2.2. Delete-Resource Response ....................... 18
4.2.3. Refresh-Resource Operation ......................... 18
4.2.3.1. Refresh-Resource Request ....................... 19
4.2.3.2. Refresh-Resource Response ...................... 19
4.2.4. Renew-Resource Operation ........................... 20
4.2.4.1. Renew-Resource Request ......................... 20
4.2.4.2. Renew-Resource Response ........................ 21
4.3. Printer Operation Extensions - REQUIRED ................ 21
4.3.1. Get-Printer-Attributes Operation ................... 21
4.4. Resource Operation Response Status Codes ............... 13 22
5. Resource Attributes ........................................ 14 23
5.1. Table of Required Resource Template Attributes .................. 14 23
5.2. Table of Optional Resource Description Attributes .................. 15 ............... 24
5.3. Resource Template Attributes ........................... 16 24
5.3.1. resource-info (text(127)) .......................... 16
5.3.2. resource-charset (charset) ......................... 16
5.3.3. 24
5.3.2. resource-natural-language (naturalLanguage) ........ 16 25
5.3.3. resource-info (text(127)) .......................... 25
5.3.4. resource-document-formats (1setOf mimeMediaType) ... 17 25
5.3.5. resource-os-types (1setOf type2 keyword) ........... 17 resource-create-date-time (dateTime) ............... 25
5.3.6. resource-lease-duration (integer(0:MAX)) ........... 26
5.3.7. resource-data-present (boolean) .................... 17
5.3.7. 26
5.3.8. resource-data-uri (1setOf uri) ..................... 18
5.3.8. 27
5.3.9. resource-data-k-octets (integer(0:MAX)) ............ 18
5.3.9. 27
5.3.10. resource-data-compression (type3 keyword) .......... 18
5.3.10. resource-create-date-time (dateTime) .............. 19
5.3.11. resource-duration (integer(0:MAX)) ................ 19
5.3.12. resource-persistence (boolean) .................... 19 ......... 28
5.4. Resource Description Attributes ........................ 20 28
5.4.1. resource-type (type2 keyword) ...................... 20 28
5.4.2. resource-name (name(127)) .......................... 20 28
5.4.3. resource-id (integer(1:MAX)) ....................... 20 29
5.4.4. resource-printer-uri (uri) ......................... 21 29
5.4.5. resource-create-user-name (name(MAX)) .............. 21 30
5.4.6. resource-create-time (integer(0:MAX)) .............. 21 30
5.4.7. resource-change-time (integer(0:MAX)) .............. 22
5.4.8. resource-refresh-time (integer(0:MAX)) ............. 22
5.4.9. resource-expiration-time (integer(0:MAX)) .......... 22 30
5.5. Job Template Attributes for Resources .................. 31
5.5.1. restype (name (127)) ............................... 31
5.5.2. restype-required (1setOf name(127)) ................ 31
6. Driver Rules for Resource Type ....................................... 23 Definitions ........................ 32
6.1. Table of Required Driver Do NOT define new operations for Resource Attributes ........... 23 .............. 32
6.2. Table of Optional Driver Define new type keyword for Resource Attributes ........... 23 ................... 32
6.3. Driver Define new type-specific attributes for Resource Template Attributes .................... 24
6.3.1. driver-charset (1setOf charset) .................... 24
6.3.2. driver-natural-language (1setOf naturalLanguage) ... 24
6.3.3. driver-file-type (type2 keyword) ................... 24
6.3.4. driver-file-name (name(MAX)) ....................... 25 ....... 32
6.4. Define new Printer attributes for Resource ............. 32
6.5. Define new Job attributes for Resource ................. 32
6.6. Define Printer operation extensions for Resource ....... 33
7. Conformance Requirements ................................... 26 34
7.1. IPP Client Conformance Requirements .................... 26 34
7.2. IPP Printer Conformance Requirements ................... 26 34
7.2.1. Resource Operations ................................ 26 34
7.2.2. Resource Attributes ................................ 27
7.2.3. Driver Resource Attributes ......................... 27 35
8. IANA Considerations ........................................ 28 36
9. Internationalization Considerations ........................ 28 36
10. Security Considerations ................................... 28 36
11. Encodings of Additional Resource Protocol Tags ..................... 28 36
11.1. Encodings of Additional Attribute Tags ................ 36
11.2. Encodings of Additional Operation Tags ................ 36
12. References ................................................ 28 37
13. Authors' Addresses ........................................ 29 37
14. Appendix A - Change History ............................... 30
14.1. 7 July 2000 - draft-ietf-ipp-get-resource-00.txt ...... 30 38
15. Full Copyright Statement .................................. 30 38
1. Introduction

See section 1 'Introduction' in [IPP-MOD] for a full description of
the IPP document set and overview information about IPP.

This IPP Get Resource document Object documents specifies an extension to IPP/1.0
[RFC-2565] [RFC-2566] and IPP/1.1 [IPP-MOD] [IPP-PRO]. This document
extends the current closed IPP object model with a passive polymorphic
object which is intended type - Resource - to satisfy most growth needs for
new object types in support the long-term evolution of IPP via an extensible
object framework. IPP.

This document does not specify other possible Resource operations
(e.g., 'Create-Resource') or Resource types (e.g., 'font'). A future
document may specify a complete set of system admin operations for
Resource objects. "resource-type-supported").

This document is laid out as follows:
- Section 2 adds the Resource object to the IPP object model.

- Section 3 is the terminology used throughout the document.

- Section 4 specifies the operations on Resource objects, including
new status codes for Resource operations.

- Section 5 specifies the attributes common to all Resource objects.

- Section 6 specifies the Driver rules for defining new Resource type and its additional
attributes - to allow client print support (e.g., driver) download
(all or part of an IPP Client) from an IPP Printer. object
types.

- Section 7 specifies the conformance requirements for this document.

- Section 8, 9, and 10 specify IANA, internationalization, and
security considerations.

- Section 11 allocates new protocol encoding values for this
document.

- Sections 12, 13, 14, and 15 list references, authors' addresses,
change history, and full IETF copyright statement.

2. IPP Model for Resources

See section 2 'IPP Objects' in [IPP-MOD] for a full description of
the IPP object model and terminology.

2.1. Resource Object

IPP Resource objects are used to model installed features or
capabilities of IPP Printers (e.g., 'font'). All Resource object
instances contain a common set of base Resource object attributes.

Resource object instances MAY have an additional set of attributes,
according to their "resource-type" and IPP Printer implementation.

Resource objects instances MAY also have associated data, according
to their "resource-type" and IPP Printer implementation. Resource
data (if any) is available by reference in "resource-data-uri" or by
value if "resource-data-present" is 'true' (i.e., a local copy of the
Resource data is available on the IPP Printer).

Section 4 describes each of the Resource operations in detail.

3. Terminology

This specification document uses the terminology defined in this
section.

3.1. Conformance Terminology

The terms "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT",
"RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
interpreted as described in [RFC-2119]. These terms are used to
specify conformance requirements which apply if this specification is
implemented (in addition to IPP/1.0 or higher).

3.2. Model Terminology

See section 12.2 'Model Terminology' in [IPP-MOD].

4. Resource Operations

The common semantics of all IPP Resource operations are the ones
defined for all IPP operations in [IPP-MOD], e.g., "operation-id",
"status-code", "attributes-charset", etc.

See section 3.1 'Common Semantics' in [IPP-MOD].

4.1. Resource Query Package - REQUIRED

The following three Resource query operations are REQUIRED for all
IPP Printers to implement, if they implement Resource objects.

4.1.

4.1.1. Get-Resource-Attributes Operation

REQUIRED - for IPP Printers to implement.

This operation allows an IPP Client to request the values of
attributes of a Resource object instance and is similar to the
Get-Job-Attributes operation (see section 3.2.5 in [IPP-MOD]). The
only differences are that the operation is directed at a Resource
object instance rather than a Job object instance, there is a
"resource-type" operation attribute required when querying a Resource
object, and the returned attribute group is a set of Resource object
attributes rather than a set of Job object attributes.

For Resources, the possible names of attribute groups are:

- 'resource-template': the subset of the Resource Template
attributes that the implementation supports for Resource objects. objects
(see section 5.1).
- 'resource-description': the subset of the Resource Description
attributes that the implementation supports for Resource objects. objects
(see section 5.2).
- 'all': the special group 'all' that includes all attributes that
the implementation supports for Resource objects.

Since an IPP Client MAY request specific attributes or named groups,
there is a potential that there is some overlap. For example, if an
IPP Client requests 'resource-create-time' and
'resource-description', the IPP Client is actually requesting the
"resource-create-time" attribute once by naming it explicitly, and
once by inclusion in the 'resource-description' group. In such
cases, the IPP Printer object NEED NOT return the attribute only once
in the response even if it is requested multiple times. The IPP
Client SHOULD NOT request the same attribute in multiple ways.

It is NOT REQUIRED that a Resource object instance support all
attributes belonging to a group (since some attributes are OPTIONAL).
However it is REQUIRED that each Resource object instance support all
group names.

4.1.1.

4.1.1.1. Get-Resource-Attributes Request

The IPP Client submits the Get-Resource-Attributes request to an IPP
Printer object.

The IPP Client supplies the following groups of attributes are as part of
the Get-Resource-Attributes Request when the request is directed at a
Resource object: Request:

Group 1: Operation Attributes

Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.1 in [IPP-MOD].

Target:
The "printer-uri" (uri) operation attribute which is the target for
this operation
ALL Resource operations as described in section 3.1.5 in [IPP-MOD].

ISSUE_1: The target of all IPP Resource operations is always
simply "printer-uri" and separate required operation attributes are
used to specify resource type and name or ID. This is like IPP
Subscription objects but unlike the earlier IPP Job objects.
Should we continue to follow the IPP Subscription object model?

Resource Type:
The "resource-type (type2 keyword)" attribute as described in
section 5.2.1 5.4.1. The IPP Client MUST supply "resource-type" in this document. all
IPP Resource operation requests. The IPP Printer MUST support and
validate "resource-type" in all IPP Resource operation requests.

Resource Name or ID:
The "resource-name (name(127))" attribute as described in section
5.2.2
5.4.2 in this document OR
<OR>
the "resource-id (integer(1:MAX))" attribute as described in
section 5.2.3 in this document. 5.4.3.

Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be supplied
by the IPP Client as described in section 8.3 in [IPP-MOD].

If the IPP Client omits this attribute, the IPP Printer MUST
respond as if this attribute had been supplied with a value of
'all'.

4.1.2.

4.1.1.2. Get-Resource-Attributes Response

The Printer object returns the following sets of attributes as part
of the Get-Resource-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 sections 13 and 3.1.6 in [IPP-MOD].

Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.2 in [IPP-MOD]. The
"attributes-natural-language" MAY be the natural language of the
Resource object, rather than the one requested.

Group 2: Unsupported Attributes

See section 3.1.7 in [IPP-MOD] for details on returning Unsupported
Attributes.

The response NEED NOT contain the "requested-attributes" operation
attribute with any supplied values (attribute keywords) that were
requested by the IPP Client but are not supported by the IPP
Printer. If the Printer object does include unsupported attributes
referenced in "requested-attributes" and such attributes include
group names, such as 'all', the unsupported attributes MUST NOT
include attributes described in this document but not supported by
the implementation.

Group 3: Resource Object Attributes

This is the set of requested Resource object attributes and their
current values. values, i.e., any of the Resource object attributes in the
tables in sections 5.1 and 5.2. The IPP Printer ignores (does not
respond with) any requested attribute or value which is not
supported or which is restricted by the security policy in force,
including whether the requesting user is the user that created the Resource.
Resource object instance. However, the IPP Printer MUST respond
with the 'unknown' value for any supported attribute (including all
REQUIRED attributes) for which the IPP Printer does not know the
value, unless it would violate the security policy. See the
description of the "out-of-band" values in the beginning of Section
4.1 in [IPP-MOD].

4.2.

See section 5.1 'Table of Resource Template Attributes'.
See section 5.2 'Table of Resource Description Attributes'.

4.1.2. Get-Resource-Data Operation

REQUIRED - for IPP Printers to implement.

This operation allows an IPP Client to request the values of
attributes of a Resource object instance AND the value of associated
Resource data (i.e., this operation is like 'Print-Job'). 'Print-Job' except that
the opaque data is transferred in the opposite direction). This
operation is a strict superset of the Get-Resource-Attributes
operation above. The only difference is that the operation returns
Resource data in addition to Resource attributes.

This operation is only legal supported for certain the "resource-type" values for
which the Resource is defined to allow data (e.g., 'form'). If the
IPP Client supplies a value for "resource-type" that does NOT allow
Resource data, the IPP Printer MUST return a status code of "resource-type".
'client-error-not-possible'.

Note: This separate operation is defined (rather than overloading
the 'Get-Resource-Attributes' operation above) to simplify access
control policies. Note that many possible future some Resource types (e.g, 'font') MAY
have have copyright and intellectual property considerations with
respect to IPP Clients reading their associated data.

4.2.1.

4.1.2.1. Get-Resource-Data Request

See section 4.1.1 4.1.1.1 'Get-Resource-Attributes Request' in this document. Request'.

The IPP Client submits the Get-Resource-Data request to an IPP
Printer object.

The IPP Client supplies the following groups of attributes are as part of
the Get-Resources
request: Get-Resource-Data Request:

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1 4.1.1.1
'Get-Resource-Attributes Request'.

4.2.2.

4.1.2.2. Get-Resource-Data Response

See section 4.1.2 4.1.1.2 'Get-Resource-Attributes Response' in this
document. Response'.

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.2 4.1.1.2
'Get-Resource-Attributes Response'.

Group 2: Unsupported Attributes

See 'Group 2: Unsupported Attributes' in section 4.1.2 4.1.1.2
'Get-Resource-Attributes Response'.

Group 3: Resource Object Attributes

See 'Group 3: Resource Object Attributes' in section 4.1.2 4.1.1.2
'Get-Resource-Attributes Response'.

See section 5.1 'Table of Resource Template Attributes'.

Group 4: Resource Object Data Content

See section 5.3.6 'resource-data-present' in this document. 5.x 'resource-data-present'.
See section 3.2.1.1 'Print-Job Request' in [IPP-MOD].

The IPP Printer MUST return the Resource data content (if any) to the IPP
Client, within the constraints of administratively configured
access control policies and any applicable copyright or other
intellectual property considerations.

4.3.

4.1.3. Get-Resources Operation

REQUIRED - for IPP Printers to implement.

This operation allows an IPP Client to retrieve the list of Resource
object instances (of a specified resource type) belonging to the
target Printer object. The IPP Client may also supply a list of
Resource attribute names and/or attribute group names. A group of
Resource object attributes will be returned for each Resource object
instance that is returned.

This operation is similar to the Get-Resource-Attributes operation,
except that this Get-Resources operation returns attributes from
possibly more than one object.

See section 3.2.6 'Get-Jobs Operation' in [IPP-MOD].

4.3.1.

4.1.3.1. Get-Resources Request

The IPP Client submits the Get-Resources request to an IPP Printer
object.

The IPP Client supplies the following groups of attributes are as part of
the Get-Resources
request: Request:

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1 4.1.1.1
'Get-Resource-Attributes Request'.

Resource Name or ID:
[omitted]
The IPP Client MUST NOT send either "resource-name" or
"resource-id". The IPP Printer MUST return them as Unsupported
Attributes if supplied and MUST reject the Get-Resources operation.

"limit" (integer(1:MAX)):
[added]
The IPP Client OPTIONALLY supplies this attribute. The IPP Printer
MUST MUST support this attribute. It is an integer value that
determines the maximum number of resources that an IPP Client will
receive from the IPP Printer.

Groups 2 to N: Resource Filter Attributes
[added]

See 'Group 3: Resource Object Attributes' in section 4.1.2 4.1.1.2
'Get-Resource-Attributes Response'.

This is the set of filter attributes and their filter values. The
IPP Printer ignores Resources which do not satisfy the specified
filter. A multi-valued filter attribute matches if the
corresponding Resource object instance attribute contains all of
the one or more values of the multi-valued filter attribute.

The filter criteria in each Resource Filter Attribute group MUST
all be true for a match (logical AND within the set). But only ONE
Resource Filter Group need be true for a match (logical OR across
the sets).

4.3.2.

ISSUE_2: What mechanism should we use for filters?
1. Group mechanism with multiple new Resource Filter Attributes
groups, limited to simple logical AND and OR filters?

2. Simple mechanism with new "resource-filter (collection)"
operation attribute in Get-Resources operations, limited to one
simple logical AND filter?

3. Robust mechanism with new "resource-filter (text)" operation
attribute in Get-Resources operations, supporting full LDAPv3
string attribute filters or a profile (subset) of LDAPv3
filters?
See 'String Representation of LDAP Search Filters' [RFC-2254].

[Editor - favors solution 3 at this writing]

4.1.3.2. Get-Resources Response

The Printer object returns all of the Resource object instances, up
to the number specified by the "limit" attribute, that match the
criteria as defined by the filter attribute values supplied by the
IPP Client in the request. It is possible that no Resource objects
are returned since there may literally be none at the Printer, or
there may be no Resource objects that match the criteria supplied by
the IPP Client. If the IPP Client requests any Resource attributes
at all, there is a set of Resource Object Attributes returned for
each Resource object instance.

It is not an error for the IPP Printer to return 0 Resources. If the
response returns 0 Resources because there are no Resources matching
the criteria, and the request would have returned 1 or more Resources
with a status code of 'successful-ok' if there had been Resources
matching the criteria, then the status code for 0 Resources MUST be
'successful-ok'.

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.3.1
'Get-Resources Request'.

Group 2: Unsupported Attributes

See 'Group 2: Unsupported Attributes' in section 4.1.2 4.1.1.2
'Get-Resource-Attributes Response'.

Groups 3 to N: Resource Object Attributes
See 'Group 3: Resource Object Attributes' in section 4.1.2 4.1.1.2
'Get-Resource-Attributes Response'.

See section 5.1 'Table of Resource Template Attributes'.

Resource object instances are MUST be returned sorted by "resource-id".

ISSUE_2:

ISSUE_3: Should we require that Resource object instances are always
returned sorted by "resource-id" (as stated above) and not by
"resource-name" (more user-friendly). Should we add an operation
attribute to control the choice of sort order?

4.2. Resource Admin Package - OPTIONAL

The following four Resource admin operations are OPTIONAL for all IPP
Printers to implement, if they implement Resource objects. However,
when implemented, these four Resource admin operations MUST be
implemented as a package (all four).

Note: The Set-Resource operation is intentionally NOT defined here.
For simplicity and robustness, Resource object instances are entirely
static, except that their leases MAY be renewed with the
Renew-Resource operation.

4.2.1. Create-Resource Operation

OPTIONAL - for IPP Printers to implement.

This operation allows an authorized IPP Client to create a Resource
object instance on this IPP Printer and to send OPTIONAL Resource
data for local storage on the IPP Printer along with the Resource
object attributes for those values of "resource-type" which are
defined to allow Resource data.

Note: Specific Resource types (values of "resource-type") constrain
whether Resource data may be sent with the Create-Resource operation.

4.2.1.1. Create-Resource Request

The IPP Client submits the Create-Resource request to an IPP Printer
object.

The IPP Client supplies the following groups of attributes as part of
the Create-Resource Request:

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1.1
'Get-Resource-Attributes Request'.

"resource-name" (name(127)):
The IPP Client MUST supply this attribute.
Note: Unlike the "job-name" attribute, the value of
"resource-name" MUST be unique among Resources of the SAME
"resource-type". IPP Printers MUST not allow Resource object
instances of the SAME "resource-type" to exist with duplicate
"resource-name" values. IPP Printers MUST reject Create-Resource
operations that specify duplicate "resource-name" values.

"resource-id" (integer(1:MAX)):
[omitted]
The IPP Client MUST NOT send "resource-id" and the IPP Printer MUST
return it in Unsupported Attributes if supplied.

"requested-attributes" (1setOf keyword):
The IPP Client OPTIONALLY supplies this attribute. The IPP Printer
MUST support this attribute. It is a set of attribute names and/or
attribute group names in whose values the requester is interested.
If the IPP Client omits this attribute, the IPP Printer MUST
respond as if this attribute had been supplied with a value of
'all'.

ISSUE_4: Should we make Resources more Subscriptions (and Jobs)
and just drop the "requested-attributes" from all of the Resource
admin operations? Then "requested-attributes" would only be
permitted in the Resource query operations.

Group 2: Resource Object Attributes

This is the set of IPP Client supplied Resource Template attributes
and their new values, i.e., any of the Resource object attributes
in section 5.1.

The IPP Client MUST supply the "resource-create-date-time"
attribute (see section 5.3.5). All other Resource attributes are
OPTIONAL for the IPP Client to supply.

See 'Group 3: Resource Object Attributes' in section 4.1.1.2
'Get-Resource-Attributes Response'.

See section 5.1 'Table of Resource Template Attributes'.

Group 3: Resource Object Data

See section 5.x 'resource-data-present'.
See section 3.2.1.1 'Print-Job Request' in [IPP-MOD].

The IPP Client OPTIONALLY sends the Resource data (if any) to the
IPP Printer, within the constraints of administratively configured
access control policies and any applicable copyright or other
intellectual property considerations. If the IPP Client supplies
Resource data for a Resource type that is not defined to allow
Resource data, the IPP Printer MUST reject the request and return a
status code of 'client-error-not-possible'.

4.2.1.2. Create-Resource Response

See section 4.1.1.2 'Get-Resource-Attributes Response'.

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1.2
'Get-Resource-Attributes Response'.

Group 2: Unsupported Attributes

See 'Group 2: Unsupported Attributes' in section 4.1.1.2
'Get-Resource-Attributes Response'.

Group 3: Resource Object Attributes

This group MUST be returned if and only if the "status-code"
parameter returned in Group 1 has the value 'successful-ok' or
'successful-ok-ignored-or-substituted-attributes'. All IPP
Printers MUST return the following Resource attributes in
successful Create-Resource responses:
"resource-id" (integer(1:MAX)) -- generated by the IPP Printer
"resource-lease-duration" (integer(0:MAX)) -- lease actually
granted

All IPP Printers MUST support the "requested-attributes" operation
attribute and conform to the behavior described in section 4.1.1.1
'Get-Resource-Attributes Request'.

See 'Group 3: Resource Object Attributes' in section 4.1.1.2
'Get-Resource-Attributes Response'.

See section 5.1 'Table of Resource Template Attributes'.

In addition to the MANDATORY parameters required for every operation
request, the simplest Create-Resource Request consists of just the
"attributes-charset", "attributes-natural-language", "resource-type",
and "resource-name" operation attributes; the "printer-uri" target
operation attribute; the OPTIONAL Resource data (if any) and nothing
else. In this simplest case, the IPP Printer object:

- creates a new Resource object (the Resource object MAY contain
Resource data);
- generates a locally unique "resource-id" for the new Resource;
- stores the name supplied by the IPP Client in the "resource-name"
attribute in the natural language and charset requested (see
Section 3.1.4.1 of [IPP-MOD]) (if those are supported, otherwise
using the Printer object's default natural language and charset);
and
- uses its corresponding default value attributes (e.g.,
"resource-lease-duration-default") for the supported Resource
Template attributes that were not supplied by the IPP Client in the
Create-Resource operation.

4.2.2. Delete-Resource Operation

OPTIONAL - for IPP Printers to implement.

This operation allows an authorized IPP Client to delete a Resource
object instance on this IPP Printer.

4.2.2.1. Delete-Resource Request

The IPP Client submits the Delete-Resource request to an IPP Printer
object.

The IPP Client supplies the following groups of attributes as part of
the Delete-Resource Request:

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1.1
'Get-Resource-Attributes Request'.

Resource Name or ID:

The "resource-name (name(127))" attribute as described in section
5.4.2 in this document
<OR>
the "resource-id (integer(1:MAX))" attribute as described in
section 5.4.3.

4.2.2.2. Delete-Resource Response

See section 4.1.1.2 'Get-Resource-Attributes Response'.

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1.2
'Get-Resource-Attributes Response'.

Group 2: Resource Object Attributes

This group MUST be returned if and only if the "status-code"
parameter returned in Group 1 has the value 'successful-ok'. All
IPP Printers MUST return the following Resource attribute in
successful Delete-Resource responses:
"resource-id" (integer(1:MAX))

All IPP Printers MUST support the "requested-attributes" operation
attribute and conform to the behavior described in section 4.1.1.1
'Get-Resource-Attributes Request'.

4.2.3. Refresh-Resource Operation

OPTIONAL - for IPP Printers to implement.

This operation allows an authorized IPP Client to refresh a Resource
object instance on this IPP Printer (i.e., fetch the Resource data
and locally cache it, setting "resource-data-present" to 'true' and
"resource-data-k-octets" to the actual size).

4.2.3.1. Refresh-Resource Request

The IPP Client submits the Refresh-Resource request to an IPP Printer
object.

The IPP Client supplies the following groups of attributes as part of
the Refresh-Resource Request:

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1.1
'Get-Resource-Attributes Request'.

Resource Name or ID:
The "resource-name (name(127))" attribute as described in section
5.4.2 in this document
<OR>
the "resource-id (integer(1:MAX))" attribute as described in
section 5.4.3.

4.2.3.2. Refresh-Resource Response

See section 4.1.1.2 'Get-Resource-Attributes Response'.

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1.2
'Get-Resource-Attributes Response'.

Group 2: Resource Object Attributes

"resource-id" (integer(1:MAX))

All IPP Printers MUST support the "requested-attributes" operation
attribute and conform to the behavior described in section 4.1.1.1
'Get-Resource-Attributes Request'.

4.2.4. Renew-Resource Operation

OPTIONAL - for IPP Printers to implement.

This operation allows an authorized IPP Client to renew the (finite)
lease of a Resource object instance on this IPP Printer (i.e., renew
the Resource lease for "resource-duration" forward from the current
time).

4.2.4.1. Renew-Resource Request

The IPP Client submits the Renew-Resource request to an IPP Printer
object.

The IPP Client supplies the following groups of attributes as part of
the Renew-Resource Request:

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1.1
'Get-Resource-Attributes Request'.

Resource Name or ID:
The "resource-name (name(127))" attribute as described in section
5.4.2 in this document
<OR>
the "resource-id (integer(1:MAX))" attribute as described in
section 5.4.3.

Group 2: Resource Object Attributes
"resource-lease-duration" (integer(0:MAX))
Note: Even though Resource objects are static (i.e, there is no
Set-Resource operation defined, intentionally), an IPP Client MAY
supply a new (possibly different) value for
"resource-lease-duration". As always, the IPP Printer MAY grant a
shorter lease according to the value of the Printer attribute
"resource-lease-duration-supported".

in a Renew-Resource operation.

4.2.4.2. Renew-Resource Response

See section 4.1.1.2 'Get-Resource-Attributes Response'.

Group 1: Operation Attributes

See 'Group 1: Operation Attributes' in section 4.1.1.2
'Get-Resource-Attributes Response'.

Group 2: Resource Object Attributes

This group MUST be returned if and only if the "status-code"
parameter returned in Group 1 has the value 'successful-ok'. All
IPP Printers MUST return the following Resource attributes in
successful Renew-Resource responses:
"resource-id" (integer(1:MAX))
"resource-lease-duration" (integer(0:MAX))

All IPP Printers MUST support the "requested-attributes" operation
attribute and conform to the behavior described in section 4.1.1.1
'Get-Resource-Attributes Request'.

4.3. Printer Operation Extensions - REQUIRED

4.3.1. Get-Printer-Attributes Operation

This operation is extended so that it returns Printer attributes
defined .

All IPP Printers that support IPP Resource objects MUST implement
this extension to the 'Get-Printer-Attributes' operation.

In addition to the requirements of [IPP-MOD] section 3.2.5, an IPP
Printer MUST support the following additional values for the
"requested-attributes" Operation attribute in this operation and
return such attributes in the Printer Object Attributes group of its
response.

1. Resource Template Attributes: ALL "xxx-default" attributes in
column 1 of section 5.1 'Table of Resource Template Attributes'.

2. New Printer Description Attributes: ALL "xxx-supported"
attributes in column 1 of section 5.1 'Table of Resource Template
Attributes'.

3. New Group Name: The 'resource-template' group name, which names
all supported Resource Template attributes in section 5.1 'Table
of Resource Template Attributes'. This group name is also used in
the Get-Resources-Attributes and Get-Resources operation with an
analogous meaning.

4. Extended Group Name: The 'all' group name, which names all IPP
Printer attributes according to [IPP-MOD] section 3.2.5. In this
extension 'all' names all attributes specified in [IPP-MOD] plus
those named in items 1 and 2 of this list.

4.4. Resource Operation Response Status Codes

client-error-not-authenticated
client-error-not-authorized
client-error-resource-type-not-supported
client-error-resource-data-not-supported
client-error-resource-data-not-present

5. Resource Attributes

All IPP Resource attributes presently defined are REQUIRED for all IPP
Printer implementations of Resource objects.

5.1. Table of Required Resource Template Attributes

All IPP Printers that support IPP Resource objects MUST implement ALL
of the following REQUIRED Resource Template attributes defined in
this specification (on the Resource object or the Printer object): object as
specified below).

All Resource Template attributes are passed in a Resource Attributes
Group in IPP Resource operations.

Resource Object Attribute Resource Attribute Type
Operation or Resource Group
Printer Attribute Object Attribute(s) Printer Attribute Type Type(s)
----------------------------------- --------------------------
resource-type (type2 keyword)
resource-type [Operation group]
resource-type-supported (1setOf type2 keyword)

resource-name (name(127))
resource-name [Operation group]
[none]

resource-id (integer(1:MAX))
resource-id [Operation group]
max-resources-supported (integer(0:MAX))

resource-printer-uri (uri)
printer-uri [Operation group]
printer-uri-supported (1setOf uri) -----------------------------
resource-charset (charset)
attributes-charset [Operation group]
charset-configured (charset)
charset-supported (1setOf charset)

resource-natural-language (naturalLanguage)
attributes-natural-language [Operation group]
natural-language-configured (naturalLanguage)
generated-natural-language-supported (1setOf naturalLanguage)

resource-info (text(127))
[no default/supported on Printer]

resource-document-formats (1setOf mimeMediaType)
document-format-default (mimeMediaType)
document-format-supported (1setOf mimeMediaType)

resource-create-date-time (dateTime)
[no default/supported on Printer]

resource-lease-duration (integer(0:MAX))
resource-lease-duration-default (integer(0:MAX))
resource-lease-duration-supported (rangeOfInteger(0:MAX))

resource-data-present (boolean)
resource-data-present [Resource group]
[no default on Printer]
resource-data-present-supported (1setOf boolean)

resource-data-uri (1setOf uri)
resource-data-uri [Resource group]
resource-data-schemes-supported
[no default on Printer]
reference-uri-schemes-supported (1setOf uri) uriScheme)

resource-data-k-octets (integer(0:MAX))
resource-data-k-octets [Resource group]
[no default on Printer]
resource-data-k-octets-supported (rangeOfInteger (0:MAX))

resource-data-compression (type3 keyword)
resource-data-compression [Resource group]
[no default on Printer]
compression-supported (1setOf type3 keyword)

resource-create-user-name (name(MAX))
requesting-user-name [Operation group]
[none]

resource-create-date-time (dateTime)
resource-create-date-time [Resource group]
[none]

resource-create-time (integer(0:MAX))
[none]
printer-current-time (integer(0:MAX))

resource-expiration-time (integer(0:MAX))
[none]
[printer-current-time + duration]

resource-duration (integer(0:MAX))
resource-duration [Resource group]
resource-duration-default (integer(0:MAX))
resource-duration-supported (rangeOfInteger(0:MAX))

resource-persistence (boolean)
resource-persistence [Resource group]
resource-persistence-supported (boolean)

5.2. Table of Optional Resource Description Attributes

All IPP Printers that support IPP Resource objects MAY MUST implement ALL
of the following OPTIONAL REQUIRED Resource Description attributes defined in
this specification (on the Resource object or the Printer object):

Resource Attribute object as
specified below).

All Resource Attribute Type Description attributes that MAY be supplied by an IPP
Client are passed in an Operation or Resource Attributes Group
Printer in IPP Resource
operations.

Resource Description Attribute Printer Resource Attribute Type
----------------------------------- --------------------------
resource-info (text(127))
resource-info [Resource group]
[none]
resource-document-formats (1setOf mimeMediaType)
document-format-default (mimeMediaType)
document-format-supported (1setOf mimeMediaType)

resource-os-types (1setOf type2 keyword)
resource-os-types-default (1setOf type2 keyword)
resource-os-types-supported (1setOf type2
resource-type (type2 keyword)

resource-change-time

resource-name (name(127))

resource-id (integer(1:MAX))

resource-printer-uri (uri)

resource-create-user-name (name(MAX))

resource-create-time (integer(0:MAX))
[none]
[none]

resource-refresh-time

resource-expiration-time (integer(0:MAX))
[none]
[none]

5.3. Resource Template Attributes

5.3.1. resource-info (text(127))

OPTIONAL - for IPP Printers to implement.

This attribute specifies descriptive information about this Resource
object. This may include manufacturer, version, copyright, etc.

See section 4.4.6 'printer-info' and section 4.4.9
'printer-make-and-model' in [IPP-MOD].

5.3.2. resource-charset (charset)

REQUIRED - for IPP Printers to implement.

This attribute specifies the charset of 'text' and 'name' attributes
of the Resource and of textual data in the associated Resource data
(if any).

5.3.3.

5.3.2. resource-natural-language (naturalLanguage)

REQUIRED - for IPP Printers to implement.

This attribute specifies the natural language of 'text' and 'name'
attributes of the Resource and of textual data in the associated
Resource data (if any).

5.3.3. resource-info (text(127))

REQUIRED - for IPP Printers to implement.

This attribute specifies descriptive information about this Resource
object. This may include manufacturer, version, copyright, etc.

See section 4.4.6 'printer-info' in [IPP-MOD].
See section 4.4.9 'printer-make-and-model' in [IPP-MOD].

5.3.4. resource-document-formats (1setOf mimeMediaType)

OPTIONAL

REQUIRED - for IPP Printers to implement.

This attribute specifies the list of document formats supported by
the Resource. Resource (e.g., 'application/postscript' for a Resource of type
'font').

5.3.5. resource-os-types (1setOf type2 keyword)

OPTIONAL resource-create-date-time (dateTime)

REQUIRED - for IPP Printers to implement.

This attribute specifies indicates the list of target operating system types date and time at which the Resource
object instance was created.

IPP Resource objects created during product manufacturing (via
software download to the IPP Printer, for example) MUST include a
vendor-supplied value for "resource-create-date-time". This value
SHOULD reflect the actual 'build date' of the Resource. Resource, rather than
simply the 'install date' on the IPP Printer, because this is more
informative for the end user.

IPP Resource objects created with the Create-Resource operation MUST
include an IPP Client-supplied value for "resource-create-date-time"
in the create request.

See IANA registry of operating system names at [OS-TYPE]. section 4.4.30 'printer-current-time' in [IPP-MOD].
See section 4.3.14.5 'date-time-at-creation' in [IPP-MOD].

5.3.6. resource-lease-duration (integer(0:MAX))

REQUIRED - for IPP Printers to implement.

This attribute indicates length of the Resource object instance lease
in seconds.

If this attribute is zero '0', then the lease on this Resource object
instance is infinite (i.e., the lease never expires).

If this attribute is non-zero, then this Resource object instance has
a finite lease and expires according to "resource-expiration-time"
granted by the IPP Printer.

See section 5.x 'resource-create-time'.
See section 5.x 'resource-expiration-time'.

5.3.7. resource-data-present (boolean)

REQUIRED - for IPP Printers to implement.

The attribute indicates whether or not a local copy of the Resource
data is present at the IPP Printer.

This attribute MUST default to 'false', if not supplied by the IPP
Client in the Create-Resource operation.

When "resource-data-present" is 'true' on a Resource object instance,
it indicates that the IPP Printer has stored a local copy of the
Resource data or has fetched a local copy of the Resource data that
was specified by reference in "resource-data-uri".

When "resource-data-present" is 'false' on a Resource object instance
and "resource-data-uri" is empty, it indicates that there is no
Resource data.

When "resource-data-present" is 'false' on a Resource object instance
and "resource-data-uri" is non-empty, it indicates that the IPP
Printer has NOT yet fetched a local copy of the Resource data that
was specified by reference and the value of "resource-data-k-octets"
is unverified.

See section 5.3.7 "resource-data-uri" in this document.
See section 5.3.8 "resource-data-k-octets" in this document.

5.3.7. 4.2.3 'Refresh-Resource Operation'.

5.3.8. resource-data-uri (1setOf uri)

REQUIRED - for IPP Printers to implement.

This attribute contains the URI of associated Resource data (if any)
as a reference.

Lazy Refresh:
An IPP Printer NEED NOT immediately fetch a local copy of the
Resource data specified by reference in "resource-data-uri", but MUST
set "resource-data-present" to 'false' until a local copy is fetched.

When an IPP Printer does fetch a local copy of the Resource data, it
MUST set (REQUIRED) "resource-data-present" to 'true', 'true' and set
(REQUIRED) "resource-data-k-octets" to the actual size, and update the timestamp
in the (OPTIONAL) "resource-refresh-time" attribute.

ISSUE_3: size.

ISSUE_5: This 'lazy refresh' behavior may have performance and
'stale data' consequences for IPP Clients. Because the manufacturer
may also be slow to inform installed IPP Printers of a new version of
a Resource (for update by means outside of this specification) the
'stale data' problem may also apply to IPP Printers. Should we add
an operation attribute to prevent PREVENT this 'lazy refresh' behavior?

See section 5.3.6 "resource-data-present" in this document. 4.2.3 'Refresh-Resource Operation'.
See section 5.x 'resource-data-present'.
See section 4.4.27 'reference-uri-schemes-supported' in [IPP-MOD].
See section 3.2.2 'Print-URI' in [IPP-MOD].

5.3.8.

5.3.9. resource-data-k-octets (integer(0:MAX))

REQUIRED - for IPP Printers to implement.

This attribute contains the size of associated Resource data (if
any). An IPP Printer MUST set this attribute to zero for Resource
types that MUST not have Resource data supplied by reference in
"resource-data-uri" or by value in a Create-Resource operation.

See 'Lazy Refresh' in section 5.3.7 5.x 'resource-data-uri' of this
document for IPP Printer behavior with respect to
"resource-data-k-octets".

See section 5.3.6 "resource-data-present" in this document.

5.3.9. 4.2.3 'Refresh-Resource Operation'.
See section 5.x 'resource-data-present'.

5.3.10. resource-data-compression (type3 keyword)

REQUIRED - for IPP Printers to implement.

This attribute identifies the compression of the associated Resource
data (if any).

See section 4.4.32 'compression-supported' in [IPP-MOD] for standard
keyword values.

5.3.10. resource-create-date-time (dateTime)

REQUIRED - for IPP Printers to implement.

This attribute indicates the date and time at which the Resource
object instance was created.

Note: This time SHOULD reflect the actual 'build date' of the
Resource data rather than simply the 'install date' on the IPP
Printer, because this is more informative for the end user.

See section 4.4.30 'printer-current-time' in [IPP-MOD].
See section 4.3.14.5 'date-time-at-creation' in [IPP-MOD].

5.3.11. resource-duration (integer(0:MAX))

REQUIRED - for IPP Printers to implement.

This attribute indicates length of the Resource object instance lease
in seconds.

See section 5.4.6 "resource-create-time" in this document.
See section 5.4.9 "resource-expiration-time" in this document.

5.3.12. resource-persistence (boolean)

REQUIRED - for IPP Printers to implement.

This attribute indicates whether or not this Resource object instance
is persistent (preserved by the IPP Printer across power cycles).

A 'true' value specifies an infinite lease and supersedes
"resource-duration" and "resource-expiration-time". A 'false' value
specifies a finite lease and selects use of "resource-duration" and
"resource-expiration-time".

See section 5.3.11 "resource-duration" in this document.
See section 5.4.9 "resource-expiration-time" in this document.

5.4. Resource Description Attributes

5.4.1. resource-type (type2 keyword)

REQUIRED - for IPP Printers to implement.

This attribute identifies the type of this Resource object instance
which determines additional Resource attributes specific to the named
type.

The following standard keyword values are defined:

'driver':

'font': The Resource contains client print support files
(e.g., a driver) font characteristics and
(OPTIONALLY) font data.

'form': The Resource contains form characteristics and
(OPTIONALLY) form data.

'image': The Resource contains image characteristics and
(OPTIONALLY) image data.

'logo': The Resource contains logo characteristics and
(OPTIONALLY) logo data.

'media': The Resource contains media characteristics for an IPP Client (see a
single medium and MUST NOT contain media data.

See section 6 'Driver
Resource Type' in this document) 5.5 'Job Template Attributes for this IPP Printer. Resources'.

5.4.2. resource-name (name(127))

REQUIRED - for IPP Printers to implement.

This attribute is the human-readable name of the Resource. Resource object
instance. This name is more user-friendly than the integer
"resource-id" attribute.

This name

Note: Unlike the "job-name" attribute, the value of "resource-name"
MUST be unique among Resources of the SAME "resource-type". IPP
Printers MUST not allow Resource object instances of the SAME
"resource-type" to exist with duplicate "resource-name" values. IPP
Printers MUST reject Create-Resource operations that specify
duplicate "resource-name" values.

Note: This attribute has been specified as REQUIRED (unlike
"job-name") in the interests of ease-of-use. IPP Printers are
expected to implement large numbers of Resource objects and the
guaranteed presence of the a user-friendly name will benefit ease-of-use.

See section 4.3.5 'job-name' in [IPP-MOD].

5.4.3. resource-id (integer(1:MAX))

REQUIRED - for IPP Printers to implement.

This attribute contains the locally unique ID (for a given value of
"resource-type") of the Resource. Resource object instance.

The IPP Printer, on creation of a new Resource object instance, (by
means outside of this
specification), specification) generates an ID which identifies
the new Resource object instance on
that the Printer specified by the
value of "resource-printer-uri" (but not globally). The zero '0'
value is not included to allow for compatibility with SNMP index
values which also cannot be zero '0'.

See section 4.3.2 'job-id' in [IPP-MOD].

5.4.4. resource-printer-uri (uri)

REQUIRED - for IPP Printers to implement.

This attribute identifies the IPP Printer that hosts this Resource
object instance. instance (i.e., records the value of the "printer-uri" target
attribute from a Create-Resource operation).

See section 4.3.3 'job-printer-uri' in [IPP-MOD].

5.4.5. resource-create-user-name (name(MAX))

REQUIRED - for IPP Printers to implement.

This attribute contains the name of the end user that created this
Resource object instance.

For factory-installed resources, "resource-create-user-name" MUST be
set to the empty string to prevent namespace conflicts in end user
networks.

See section 4.3.6 'job-originating-user-name' in [IPP-MOD].

5.4.6. resource-create-time (integer(0:MAX))

REQUIRED - for IPP Printers to implement.

This attribute indicates the time at which the Resource object
instance was created.

Note: This time SHOULD reflect created (i.e., the actual 'build time' value of "printer-up-time" when the
Resource data rather than simply object instance was created).

If this Resource was created prior to the 'install time' on most recent system startup,
then the IPP
Printer, because Printer MUST set this is more informative for the end user. attribute to zero '0'.

See section 5.x 'resource-expiration-time'.
See section 5.x 'resource-lease-duration'.
See section 4.4.29 'printer-up-time' in [IPP-MOD].
See section 4.3.14.1 'time-at-creation' in [IPP-MOD].

5.4.7. resource-change-time resource-expiration-time (integer(0:MAX))

REQUIRED - for IPP Printers to implement.

This attribute indicates the time at which the Resource object
instance was last changed. lease will expire. (i.e., the value of "printer-up-time"
when the Resource object instance will be deleted by the IPP
Printer).

If "resource-lease-duration" is zero '0', then the IPP Printer MUST
set "resource-expiration-time" also to zero '0' (i.e., infinite
lease).

See section 5.4.6 "resource-create-time" in this document. 5.x 'resource-create-time'.
See section 5.x 'resource-lease-duration'.

See section 4.4.29 'printer-up-time' in [IPP-MOD].

5.4.8. resource-refresh-time (integer(0:MAX))

REQUIRED -
See section 4.3.14.3 'time-at-completed' in [IPP-MOD].

5.5. Job Template Attributes for IPP Printers Resources

Each Resource Type Definition MUST specify whether or not the
Resource type MAY be associated with a Job object. If so, then two
new Job Description attributes are algorithmically added to implement. the
definition of a Job object:

5.5.1. restype (name (127))

Where 'restype' is a standard keyword for "resource-type" (e.g.,
'media' yields the Job attribute named simply "media").

This Job attribute indicates the time at which specifies the "resource-name" value of a single
Resource object instance was last refreshed (i.e., a local copy with "resource-type" of 'restype' that is
REQUIRED for this Job and that SHOULD override any PDL instructions
in the Resource data
was made). Job datastream.

This attribute supplies advice for job scheduling to the IPP Printer.

See section 5.4.6 "resource-create-time" 4.2.1 "media" in this document. [IPP-MOD].
See 'media-needed' keyword in section 4.4.29 'printer-up-time' 4.4.12 "printer-state-reasons"
in [IPP-MOD].

5.4.9. resource-expiration-time (integer(0:MAX))

REQUIRED -

5.5.2. restype-required (1setOf name(127))

Where 'restype' is a standard keyword for IPP Printers to implement. "resource-type" (e.g.,
'media' yields the Job attribute named "media-required").

This Job attribute indicates the time at which specifies the "resource-name" values of a set of
Resource object
instance lease will expire.

See section 5.4.6 "resource-create-time" in instances with "resource-type" of 'restype' that are
REQUIRED for this document.
See section 5.3.11 "resource-duration" Job and that SHOULD override any PDL instructions
in this document. the Job datastream.

This attribute supplies advice for job scheduling to the IPP Printer.

See section 4.4.29 'printer-up-time' 4.2.1 "media" in [IPP-MOD].
See 'media-needed' keyword in section 4.3.14.5 'date-time-at-creation' 4.4.12 "printer-state-reasons"
in [IPP-MOD].

6. Driver Rules for Resource Type Definitions

6.1. Table of Required Driver Resource Attributes

All IPP Printers that support Driver Do NOT define new operations for Resource objects MUST implement
the following

REQUIRED attributes defined in this specification (on
the Driver Resource object or - Do NOT define any new operations for the Printer object):

Driver Resource Attribute Driver Attribute Type
Operation or Resource Group
Printer Attribute Printer Attribute Type
------------------------------- --------------------------
driver-file-type (type2 keyword)
driver-file-type [Resource group]
driver-file-type-default (type2 keyword)
driver-file-type-supported (1setOf type2 keyword)

driver-file-name (name(MAX))
driver-file-name [Resource group]
[none] Resource.

6.2. Table of Optional Driver Resource Attributes

All IPP Printers that support Driver Resource objects MAY implement
the following OPTIONAL attributes defined in this specification (on
the Driver Define new type keyword for Resource object or

REQUIRED - Define a new type keyword 'restype' for the Printer object):

Driver Resource Attribute Driver Attribute Type
Operation or Resource Group
Printer Attribute Printer Attribute Type
------------------------------- --------------------------
driver-charset (1setOf charset)
driver-charset [Resource group]
charset-configured (charset)
charset-supported (1setOf charset)

driver-natural-language (1setOf naturalLanguage)
driver-natural-language [Resource group]
natural-language-configured (naturalLanguage)
generated-natural-language-configured (1setOf naturalLanguage) Resource.

6.3. Driver Define new type-specific attributes for Resource Template Attributes

6.3.1. driver-charset (1setOf charset)

OPTIONAL - Define type-specific attributes for IPP Printers to implement.

This attribute specifies the list Resource with
names of client charsets
supported by the Driver Resource (when installed on form "restype-yyy" (e.g., "media-size"), using the client system

6.3.2. driver-natural-language (1setOf naturalLanguage)

OPTIONAL - for IPP Printers to implement.

This
'restype' keyword chosen above. is a simple attribute specifies the list of client natural languages
supported by the Driver name for this
Resource type.

6.4. Define new Printer attributes for Resource (when installed on the client system

6.3.3. driver-file-type (type2 keyword)

REQUIRED - for IPP Printers to implement.

This attribute specifies the client file type of
this Driver Define new Resource (when installed Template attributes on the client system).

The following standard Printer
object for the Resource, named "restype-default" and
"restype-supported", using the 'restype' keyword chosen above (e.g.,
"media-default" and "media-supported"). "restype-supported" lists
all the current values are defined:

'none': The Driver Resource contains client print support files i
unspecified (opaque) format.

'exec': The Driver Resource contains client print support files i
native executable format of the operating system(s) specified in
"resource-os-types" attribute, "resource-name" for example '.exe' on Microsoft sy

'gpd': The Driver Resource contains client print support files in
Microsoft GPD format.

'java': The Driver Resource contains client print support files i

'ppd': The Driver Resource contains client print support files in
Adobe PPD format.

'printcap': The Driver this Resource contains client print support fil
the UNIX 'printcap' format.

'script': The Driver type.

OPTIONAL - Define new Resource contains client print support files
native script format of Template attributes on the operating system(s) specified in Printer
object for the
"resource-os-types" attribute, Resource, if this Resource has type-specific
attributes (e.g., "media-size-default").

6.5. Define new Job attributes for example Bourne shell on UNIX s
Note: This type may be ambiguous on some target operating system

'updf': The Driver Resource contains client print support files i
(work-in-progress) PWG UPDF format.

6.3.4. driver-file-name (name(MAX))

REQUIRED

OPTIONAL - Define new Job Template attributes for IPP Printers to implement.

This attribute specifies the client file name of Resource, if
this Driver Resource (when installed on the client system)
or the empty string (if none configured).
If this Driver MAY be associated with a Job (e.g., "media-required").

See section 5.5 'Job Template Attributes for Resources'.

6.6. Define Printer operation extensions for Resource contains multiple client print support files,
then "driver-file-name" SHOULD specify an 'install directory path'.

7. Conformance Requirements

7.1. IPP Client Conformance Requirements

IPP Clients MUST supply the required operation attributes in Resource
operations.

7.2. IPP Printer Conformance Requirements

7.2.1. Resource Operations

All IPP Printers that support IPP Resource objects MUST implement the
following REQUIRED operations defined in this specification:

Resource Operation
------------------
Get-Resources
Get-Resource-Attributes
Get-Resource-Data
Get-Resources
7.2.2. Resource Attributes

See section 5.1 'Table of Required

All IPP Resource Attributes' and section
5.2 'Table attributes presently defined are REQUIRED for all
IPP Printer implementations of Optional Resource Attributes'.

7.2.3. Driver Resource Attributes objects.

See section 6.1 5.1 'Table of Required Driver Resource Template Attributes' and
See section 6.2 5.2 'Table of Optional Driver Resource Description Attributes'.

8. IANA Considerations

See section 6 'IANA Considerations' in [IPP-MOD].

9. Internationalization Considerations

This IPP Resource Objects and Get Resource Operations specification continues support for the
internationalization in [IPP-MOD] attributes containing text strings
and names.

See section 7 'Internationalization Considerations' in [IPP-MOD].

10. Security Considerations

This IPP Resource Objects and Get Resource Operations specification inherits the same security
considerations for Resources as are specified for Jobs in [IPP-MOD].

See section 8 'Security Considerations' in [IPP-MOD].

11. Encodings of Additional Resource Protocol Tags

11.1. Encodings of Additional Attribute Tags

The section assigns values a value to a new protocol tags attribute tag as extensions an extension to
the encoding defined in [IPP-PRO].

The resource-attributes-tag delimits Resource Template Attributes
Groups in requests and Resource Attributes Groups in responses.

Tag Value (Hex) Tag Meaning
--------------- -----------
0x08 resource-attributes-tag

11.2. Encodings of Additional Operation Tags

The section assigns values to new operation tags as extensions to the
encoding defined in [IPP-PRO].

Tag Value (Hex) Tag Meaning
--------------- -----------
0x1E Get-Resource-Attributes operation
0x1F Get-Resource-Data operation
0x20 Get-Resources operation
[TBD] Create-Resource
[TBD] Delete-Resource
[TBD] Refresh-Resource
[TBD] Renew-Resource

12. References

See section 9 'References' in [IPP-MOD].

[IPP-MOD] R. deBry, T. Hastings, R. Herriot, S. Isaacson, P. Powell.
IPP/1.1 Model and Semantics, <draft-ietf-ipp-model-v11-07.txt>, May
2000 (adopted by IESG as Proposed Standard in June 2000).

[IPP-NOT] S. Isaacson, J. Martin, R. deBry, T. Hastings, M. Shepherd,
R. Bergman. IPP Event Notification Specification,
<draft-ietf-ipp-not-spec-02.txt> (work-in-progress), March 2000.

[OS-TYPE] IANA Registry of Operating System Names at
ftp://ftp.isi.edu/in-notes/iana/assignments/operating-system-names.

13. Authors' Addresses

Tom Hastings
Xerox Corporation
701 S Aviation Blvd, MS 834-03E
El Segundo, CA 90245

Phone: +1 310-333-6413
Email: hastings@cp10.es.xerox.com

Ira McDonald
High North Inc
221 Ridge Ave
Grand Marais, MI 49839

Phone: +1 906-494-2434 or +1 906-494-2697
Email: imcdonald@sharplabs.com
Email: imcdonal@sdsp.mc.xerox.com

14. Appendix A - Change History

[To be deleted before RFC publication]

14.1.

7 September 2000 - draft-ietf-ipp-get-resource-01.txt
- revised Abstract and Introduction for admin operations
- deleted all references to the resource type 'driver'
- named package of Resource query (Get) operations in section 4
- added package of Resource system admin operations to section 4
- added Create-Resource to create (install) static resources
- added Delete-Resource to delete (remove) static resources
- added Refresh-Resource to refresh (locally cache) resource data
- added Renew-Resource to renew (finite) resource leases
- revised section 5.1 'Table of Resource Template Attributes'
- revised section 5.2 'Table of Resource Description Attributes'
- added section 6 'Rules for Resource Type Definitions'
- deleted "resource-persistence" (redundant with zero lease)
- renamed "resource-duration" to "resource-lease-duration"
- deleted "resource-os-types" (was used for 'driver' resources)
- deleted "resource-change-time" and "resource-refresh-time"

7 July 2000 - draft-ietf-ipp-get-resource-00.txt
- initial version - Get operations and Driver resource type

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