CUPS Implementation of IPP
Keywords: Programming, Internet Printing Protocol

## Introduction

CUPS 1.1 implements IPP/1.1 and the operations and attributes defined in the "IPP: Job and Printer Set Operations", "IPP/1.1: Output-bin Attribute Extension", and "IPP/1.1: finishings 'fold',' trim', and 'bale' attribute values extension" specifications.

CUPS also provides 15 new operations and many new attributes to support multiple IPP printers and printer classes on a single host.

### IPP URIs

CUPS supports the "http", "https", and "ipp" schemes. The following resource names are used:

`scheme://hostname:port/`
  Can be used for all "get" operations and for server subscriptions.
`scheme://hostname:port/admin/`
  Used for all administrative operations.
`scheme://hostname:port/classes/name`
  Specifies a printer class.
`scheme://hostname:port/jobs/id`
  Specifies a job.
`scheme://hostname:port/printers/name`
  Specifies a printer.

So a typical printer URI would be "ipp://foo.bar.com/printers/LaserJet". In addition, the CUPS server also supports normal browser access via "http://hostname:port/" and "https://hostname:port/".

### CUPS IPP Operations

CUPS provides 14 extension operations in addition to most of the standard IPP and registered extension operations:

Operation Name | CUPS | Code | Brief Description
--- | --- | --- | ---
Print-Job | 1.0 | 0x0002 | Print a file.
Validate-Job | 1.0 | 0x0004 | Validate job attributes.
Create-Job | 1.1 | 0x0005 | Create a print job.
Send-Document | 1.1 | 0x0006 | Send a file for a print job.
Cancel-Job | 1.0 | 0x0008 | Cancel a print job.
Get-Job-Attributes | 1.0 | 0x0009 | Get job attributes.
Get-Jobs | 1.0 | 0x000A | Get all jobs.
Get-Printer-Attributes | 1.0 | 0x000B | Get printer attributes.
Hold-Job | 1.1 | 0x000C | Hold a job for printing.
Release-Job | 1.1 | 0x000D | Release a job for printing.
Restart-Job | 1.1 | 0x000E | Restarts a print job.
Pause-Printer | 1.0 | 0x0010 | Pause printing on a printer.
Resume-Printer | 1.0 | 0x0011 | Resume printing on a printer.
Purge-Jobs | 1.0 | 0x0012 | Purge all jobs.
Set-Job-Attributes | 1.1 | 0x0014 | Set attributes for a pending or held job.
Create-Printer-Subscription | 1.2 | 0x0016 | Creates a subscription associated with a printer or the server.
Create-Job-Subscription | 1.2 | 0x0017 | Creates a subscription associated with a job.
Get-Subscription-Attributes | 1.2 | 0x0018 | Gets the attributes for a subscription.
Get-Subscriptions | 1.2 | 0x0019 | Gets the attributes for zero or more subscriptions.
Renew-Subscription | 1.2 | 0x001A | Renews a subscription.
Cancel-Subscription | 1.2 | 0x001B | Cancels a subscription.
Get-Notifications | 1.2 | 0x001C | Get notification events for `ippget` subscriptions.
Enable-Printer | 1.2 | 0x0022 | Accepts jobs on a printer.
Disable-Printer | 1.2 | 0x0023 | Rejects jobs on a printer.
CUPS-Get-Default | 1.0 | 0x4001 | Get the default destination.
CUPS-Get-Printers | 1.0 | 0x4002 | Get all of the available printers.
CUPS-Add-Modify-Printer | 1.0 | 0x4003 | Add or modify a printer.
CUPS-Delete-Printer | 1.0 | 0x4004 | Delete a printer.
CUPS-Get-Classes | 1.0 | 0x4005 | Get all of the available printer classes.
CUPS-Add-Modify-Class | 1.0 | 0x4006 | Add or modify a printer class.
CUPS-Delete-Class | 1.0 | 0x4007 | Delete a printer class.
CUPS-Accept-Jobs | 1.0 | 0x4008 | Accept jobs on a printer or printer class.
CUPS-Reject-Jobs | 1.0 | 0x4009 | Reject jobs on a printer or printer class.
CUPS-Set-Default | 1.0 | 0x400A | Set the default destination.
CUPS-Get-Devices | 1.1 | 0x400B | Get all of the available devices.
CUPS-Get-PPDs | 1.1 | 0x400C | Get all of the available PPDs.
CUPS-Move-Job | 1.1 | 0x400D | Move a job to a different printer.
CUPS-Authenticate-Job | 1.2 | 0x400E | Authenticate a job for printing.
CUPS-Get-PPD | 1.3 | 0x400F | Get a PPD file.

## Operations

The following sections describe the operations supported by CUPS. In the interest of brevity, operations which use only the standard IPP attributes are not described.

### Print-Job Operation

The Print-Job operation (0x0002) prints a file.

#### Print-Job Request

The following groups of attributes are supplied as part of the Print-Job 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer.

Group 2: Job Template Attributes

"auth-info" (1setOf text(MAX)):CUPS 1.3
  The client OPTIONALLY supplies one or more authentication values as specified by the "auth-info-required" attribute.
"job-billing" (text(MAX)):CUPS 1.1
  The client OPTIONALLY supplies a billing string that is logged with the page accounting information.
"job-sheets" (1setof type3 keyword | name(MAX)):CUPS 1.1
  The client OPTIONALLY supplies one or two banner pages that are printed before and after any files in the print job. The name of "none" is reserved to indicate that no banner page should be printed. If the client does not specify this attribute then the value of the "job-sheets-default" printer object attribute is used.

  > Note: Standard IPP only allows specification of a single job-sheets attribute value.

"media" (1setof type3 keyword | name(MAX)):
  The client OPTIONALLY supplies one or more media attributes specifying the size, type, source, and color of the output media. If the client does not specify this attribute then the value of the "media-default" printer object attribute is used.

  > Note: Standard IPP only allows specification of a single media attribute value.

Other Job Template Attributes

The Print-Job request is followed by a file to be printed.

#### Print-Job Response

The following groups of attributes are send as part of the Print-Job Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Job Attributes

Standard Job Attributes

Group 3: Unsupported Attributes (status=client-eror-attributes-or-values-not-supported)

auth-info-required (1setOf Type2 keyword)
  The required authentication information.

### CUPS 1.1Create-Job Operation

The Create-Job operation (0x0005) creates a new, empty print job.

#### Create-Job Request

The following groups of attributes are supplied as part of the Create-Job 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer.

Group 2: Job Template Attributes

"auth-info" (1setOf text(MAX)):CUPS 1.3
  The client OPTIONALLY supplies one or more authentication values as specified by the "auth-info-required" attribute.
"job-billing" (text(MAX)):CUPS 1.1
  The client OPTIONALLY supplies a billing string that is logged with the page accounting information.
"job-sheets" (1setof type3 keyword | name(MAX)):CUPS 1.1
  The client OPTIONALLY supplies one or two banner pages that are printed before and after any files in the print job. The name of "none" is reserved to indicate that no banner page should be printed. If the client does not specify this attribute then the value of the "job-sheets-default" printer object attribute is used.

  > Note: Standard IPP only allows specification of a single job-sheets attribute value.

"media" (1setof type3 keyword | name(MAX)):
  The client OPTIONALLY supplies one or more media attributes specifying the size, type, source, and color of the output media. If the client does not specify this attribute then the value of the "media-default" printer object attribute is used.

  > Note: Standard IPP only allows specification of a single media attribute value.

Standard Job Template Attributes

#### Create-Job Response

The following groups of attributes are send as part of the Create-Job Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Job Attributes

Standard Job Attributes

Group 3: Unsupported Attributes (status=client-eror-attributes-or-values-not-supported)

auth-info-required (1setOf Type2 keyword)
  The required authentication information.

### CUPS 1.1Set-Job-Attributes Operation

The Set-Job-Attributes operation (0x0014) changes the attributes of an active (not completed) job.

#### Set-Job-Attributes Request

The following groups of attributes are supplied as 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 section 3.1.4.1 of the IPP Model and Semantics document.
"printer-uri" (uri) and "job-id" (integer)
OR
"job-uri":
  The client MUST supply a URI for the specified printer and a job ID number, or the job URI.

Group 2: Job Template Attributes

"job-sheets" (1setof type3 keyword | name(MAX)):CUPS 1.1
  The client OPTIONALLY supplies one or two banner pages that are printed before and after any files in the print job. The name of "none" is reserved to indicate that no banner page should be printed. If the client does not specify this attribute then the value of the "job-sheets-default" printer object attribute is used.

  > Note: Standard IPP only allows specification of a single job-sheets attribute value.

"media" (1setof type3 keyword | name(MAX)):
  The client OPTIONALLY supplies one or more media attributes specifying the size, type, source, and color of the output media. If the client does not specify this attribute then the value of the "media-default" printer object attribute is used.

  > Note: Standard IPP only allows specification of a single media attribute value.

Other Job Template Attributes

#### Set-Job-Attributes Response

The following groups of attributes are send as part of the Set-Job-Attributes Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS 1.2Create-Printer-Subscription

The Create-Printer-Subscription operation (0x0016) creates a subscription for printer or server event notifications. CUPS provides several additional events in addition to the standard events in the IPP notifications specification.

#### Create-Printer-Subscription Request

The following groups of attributes are supplied as part of the 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The printer (`ipp://server/printers/printername`), class (`ipp://server/classes/classname`), or server (`ipp://server/`) URI for event notifications.
"notify-events" (1setOf keyword):
  The events to monitor. In addition to the standard events, CUPS adds the following keywords:
  - `printer-added` - Get notified whenever a printer or class is added
  - `printer-deleted` - Get notified whenever a printer or class is deleted
  - `printer-modified` - Get notified whenever a printer or class is modified
  - `server-audit` - Get notified when a security condition occurs
  - `server-restarted` - Get notified when the server is restarted
  - `server-started` - Get notified when the server is started
  - `server-stopped` - Get notified when the server is stopped

#### Create-Printer-Subscription Response

The following groups of attributes are send as part of the response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Subscription Object Attributes

"subscription-id" (integer):
  The subscription number.

### CUPS-Get-Default Operation

The CUPS-Get-Default operation (0x4001) returns the default printer URI and attributes.

#### CUPS-Get-Default Request

The following groups of attributes are supplied as part of the CUPS-Get-Default 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 of the IPP Model and Semantics document.
"requested-attributes" (1setOf keyword) :
  The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.

#### CUPS-Get-Default Response

The following groups of attributes are send as part of the CUPS-Get-Default Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Printer Object Attributes

The set of requested attributes and their current values.

### CUPS-Get-Printers Operation

The CUPS-Get-Printers operation (0x4002) returns the printer attributes for every printer known to the system. This may include printers that are not served directly by the server.

#### CUPS-Get-Printers Request

The following groups of attributes are supplied as part of the CUPS-Get-Printers 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 of the IPP Model and Semantics document.
"first-printer-name" (name(127)):CUPS 1.2
  The client OPTIONALLY supplies this attribute to select the first printer that is returned.
"limit" (integer (1:MAX)):
  The client OPTIONALLY supplies this attribute limiting the number of printers that are returned.
"printer-location" (text(127)): CUPS 1.1.7
  The client OPTIONALLY supplies this attribute to select which printers are returned.
"printer-type" (type2 enum): CUPS 1.1.7
  The client OPTIONALLY supplies a printer type enumeration to select which printers are returned.
"printer-type-mask" (type2 enum): CUPS 1.1.7
  The client OPTIONALLY supplies a printer type mask enumeration to select which bits are used in the "printer-type" attribute.
"requested-attributes" (1setOf keyword) :
  The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.
"requested-user-name" (name(127)) : CUPS 1.2
  The client OPTIONALLY supplies a user name that is used to filter the returned printers.

#### CUPS-Get-Printers Response

The following groups of attributes are send as part of the CUPS-Get-Printers Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Printer Object Attributes

The set of requested attributes and their current values for each printer.

### CUPS-Add-Modify-Printer Operation

The CUPS-Add-Modify-Printer operation (0x4003) adds a new printer or modifies an existing printer on the system.

#### CUPS-Add-Modify-Printer Request

The following groups of attributes are supplied as part of the CUPS-Add-Modify-Printer 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer.

Group 2: Printer Object Attributes

"auth-info-required" (1setOf type2 keyword):CUPS 1.3
  The client OPTIONALLY supplies one or more authentication keywords that are required to communicate with the printer/remote queue.
"job-sheets-default" (1setOf name(127)): CUPS 1.1.7
  The client OPTIONALLY supplies one or two banner page names that are printed before and after files in a job. The reserved name "none" is used to specify that no banner page should be printed.
"device-uri" (uri):
  The client OPTIONALLY supplies a device URI for the specified printer.
"port-monitor" (name(127)):
  The client OPTIONALLY supplies a port monitor name for the specified printer.
"ppd-name" (name(127)):
  The client OPTIONALLY supplies a PPD name for the specified printer.
"printer-is-accepting-jobs" (boolean):
  The client OPTIONALLY supplies this boolean attribute indicating whether or not the printer object should accept new jobs.
"printer-info" (text(127)):
  The client OPTIONALLY supplies this attribute indicating the printer information string.
"printer-location" (text(127)):
  The client OPTIONALLY supplies this attribute indicating a textual location of the printer.
"printer-more-info" (uri):
  The client OPTIONALLY supplies this attribute indicating a URI for additional printer information.
"printer-state" (type2 enum):
  The client OPTIONALLY supplies this attribute indicating the initial/current state of the printer. Only the "idle" and "stopped" enumerations are recognized.
"printer-state-message" (text(MAX)):
  The client OPTIONALLY supplies this attribute indicating a textual reason for the current printer state.
"requesting-user-name-allowed" (1setof name(127) | delete)
OR
"requesting-user-name-denied" (1setof name(127) | delete):
  The client OPTIONALLY supplies one of these attributes to specify an access control list for incoming print jobs. To allow all users access to a printer, use the delete tag for the attribute value.

The CUPS-Add-Modify-Printer request can optionally be followed by a PPD file or System V interface script to be used for the printer. The "ppd-name" attribute overrides any file that is attached to the end of the request with a local CUPS PPD file.

#### CUPS-Add-Modify-Printer Response

The following groups of attributes are send as part of the CUPS-Add-Modify-Printer Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS-Delete-Printer Operation

The CUPS-Delete-Printer operation (0x4004) removes an existing printer from the system.

#### CUPS-Delete-Printer Request

The following groups of attributes are supplied as part of the CUPS-Delete-Printer 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer.

#### CUPS-Delete-Printer Response

The following groups of attributes are send as part of the CUPS-Delete-Printer Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS-Get-Classes Operation

The CUPS-Get-Classes operation (0x4005) returns the printer attributes for every printer class known to the system. This may include printer classes that are not served directly by the server.

#### CUPS-Get-Classes Request

The following groups of attributes are supplied as part of the CUPS-Get-Classes 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 of the IPP Model and Semantics document.
"first-printer-name" (name(127)):CUPS 1.2
  The client OPTIONALLY supplies this attribute to select the first printer that is returned.
"limit" (integer (1:MAX)):
  The client OPTIONALLY supplies this attribute limiting the number of printer classes that are returned.
"printer-location" (text(127)): CUPS 1.1.7
  The client OPTIONALLY supplies this attribute to select which printer classes are returned.
"printer-type" (type2 enum): CUPS 1.1.7
  The client OPTIONALLY supplies a printer type enumeration to select which printer classes are returned.
"printer-type-mask" (type2 enum): CUPS 1.1.7
  The client OPTIONALLY supplies a printer type mask enumeration to select which bits are used in the "printer-type" attribute.
"requested-attributes" (1setOf keyword) :
  The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.
"requested-user-name" (name(127)) : CUPS 1.2
  The client OPTIONALLY supplies a user name that is used to filter the returned printers.

#### CUPS-Get-Classes Response

The following groups of attributes are send as part of the CUPS-Get-Classes Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Printer Class Object Attributes

The set of requested attributes and their current values for each printer class.

### CUPS-Add-Modify-Class Operation

The CUPS-Add-Modify-Class operation (0x4006) adds a new printer class or modifies and existing printer class on the system.

#### CUPS-Add-Modify-Class Request

The following groups of attributes are supplied as part of the CUPS-Add-Modify-Class 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer class.

Group 2: Printer Object Attributes

"auth-info-required" (1setOf type2 keyword):CUPS 1.3
  The client OPTIONALLY supplies one or more authentication keywords that are required to communicate with the printer/remote queue.
"member-uris" (1setof uri):
  The client OPTIONALLY supplies the "member-uris" set specifying the printers and printer classes that are part of the class.
"printer-is-accepting-jobs" (boolean):
  The client OPTIONALLY supplies this boolean attribute indicating whether or not the class object should accept new jobs.
"printer-info" (text(127)):
  The client OPTIONALLY supplies this attribute indicating the printer information string.
"printer-location" (text(127)):
  The client OPTIONALLY supplies this attribute indicating a textual location of the class.
"printer-more-info" (uri):
  The client OPTIONALLY supplies this attribute indicating a URI for additional class information.
"printer-state" (type2 enum):
  The client OPTIONALLY supplies this attribute indicating the initial/current state of the class. Only the "idle" and "stopped" enumerations are recognized.
"printer-state-message" (text(MAX)):
  The client OPTIONALLY supplies this attribute indicating a textual reason for the current class state.
"requesting-user-name-allowed" (1setof name(127))
OR
"requesting-user-name-denied" (1setof name(127)):
  The client OPTIONALLY supplies one of these attributes to specify an access control list for incoming print jobs. To allow all users access to a class, use the delete tag for the attribute value.

#### CUPS-Add-Modify-Class Response

The following groups of attributes are send as part of the CUPS-Add-Modify-Class Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS-Delete-Class Operation

The CUPS-Delete-Class operation (0x4007) removes an existing printer class from the system.

#### CUPS-Delete-Class Request

The following groups of attributes are supplied as part of the CUPS-Delete-Class 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer class.

#### CUPS-Delete-Class Response

The following groups of attributes are send as part of the CUPS-Delete-Class Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS-Accept-Jobs Operation

The CUPS-Accept-Jobs operation (0x4008) sets the "printer-is-accepting-jobs" attribute to true for the specified printer or printer class.

#### CUPS-Accept-Jobs Request

The following groups of attributes are supplied as part of the CUPS-Accept-Jobs 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer or printer class.

#### CUPS-Accept-Jobs Response

The following groups of attributes are send as part of the CUPS-Accept-Jobs Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS-Reject-Jobs Operation

The CUPS-Reject-Jobs operation (0x4009) sets the"printer-is-accepting-jobs" attribute to false for the specified printer or printer class.

#### CUPS-Reject-Jobs Request

The following groups of attributes are supplied as part of the CUPS-Reject-Jobs 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer or printer class.

Group 2: Printer Object Attributes

"printer-state-message" (text(MAX)):
  The client OPTIONALLY supplies this attribute indicating a textual reason for the current printer state.

#### CUPS-Reject-Jobs Response

The following groups of attributes are send as part of the CUPS-Reject-Jobs Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS-Set-Default Operation

The CUPS-Set-Default operation (0x400A) sets the default printer destination for all clients when a resource name of "/printers" is specified.

#### CUPS-Set-Default Request

The following groups of attributes are supplied as part of the CUPS-Set-Default 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 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The client MUST supply a URI for the specified printer or printer class.

#### CUPS-Set-Default Response

The following groups of attributes are send as part of the CUPS-Set-Default Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS 1.1CUPS-Get-Devices Operation

The CUPS-Get-Devices operation (0x400B) returns all of the supported device-uri's for the server.

#### CUPS-Get-Devices Request

The following groups of attributes are supplied as part of the CUPS-Get-Devices 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 of the IPP Model and Semantics document.
"device-class" (type1 keyword):
  The client OPTIONALLY supplies a device class keyword to select which devices are returned.
"limit" (integer (1:MAX)):
  The client OPTIONALLY supplies this attribute limiting the number of devices that are returned.
"requested-attributes" (1setOf keyword) :
  The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'.

#### CUPS-Get-Devices Response

The following groups of attributes are send as part of the CUPS-Get-Devices Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Device Object Attributes

The set of requested attributes and their current values for each device.

### CUPS 1.1CUPS-Get-PPDs Operation

The CUPS-Get-PPDs operation (0x400C) returns all of the locally available PPD files on the system.

#### CUPS-Get-PPDs Request

The following groups of attributes are supplied as part of the CUPS-Get-PPDs 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 of the IPP Model and Semantics document.
"limit" (integer (1:MAX)):
  The client OPTIONALLY supplies this attribute limiting the number of PPDs that are returned.
"ppd-make" (text(127)):
  The client OPTIONALLY supplies a printer manufacturer to select which PPDs are returned.
"ppd-make-and-model" (text(127)):CUPS 1.3
  The client OPTIONALLY supplies a make and model to select which PPDs are returned.
"ppd-model-number" (integer):CUPS 1.3
  The client OPTIONALLY supplies a model number to select which PPDs are returned.
"ppd-natural-language" (naturalLanguage):CUPS 1.3
  The client OPTIONALLY supplies a language to select which PPDs are returned.
"ppd-product" (text(127)):CUPS 1.3
  The client OPTIONALLY supplies a PostScript product string to select which PPDs are returned.
"ppd-psversion" (text(127)):CUPS 1.3
  The client OPTIONALLY supplies a PostScript version string to select which PPDs are returned.
"ppd-type" (type1 keyword):CUPS 1.3
  The client OPTIONALLY supplies a driver type to select which PPDs are returned.
"requested-attributes" (1setOf keyword) :
  The client OPTIONALLY supplies a set of attribute names and/or attribute group names in whose values the requester is interested. If the client omits this attribute, the server responds as if this attribute had been supplied with a value of 'all'. Specify "ppd-make" to get a list of manufacturers.

#### CUPS-Get-PPDs Response

The following groups of attributes are send as part of the CUPS-Get-PPDs Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: PPD Attributes

The set of requested attributes and their current values for each PPD file.

### CUPS 1.1CUPS-Move-Job Operation

The CUPS-Move-Job operation (0x400D) moves an active print job to a different printer.

#### CUPS-Move-Job Request

The following groups of attributes are supplied as part of the CUPS-Move-Job 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 of the IPP Model and Semantics document.
"printer-uri" (uri) and "job-id" (integer)
OR
"job-uri":
  The client MUST supply a URI for the specified printer and a job ID number, or the job URI.

Group 2: Job Template Attributes

"job-printer-uri" (uri)
  The client MUST supply a URI for a printer on the same server.

#### CUPS-Move-Job Response

The following groups of attributes are send as part of the CUPS-Move-Job Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

### CUPS 1.2CUPS-Authenticate-Job Operation

The CUPS-Authenticate-Job operation (0x400E) authenticate a print job for printing. Typically this is used when printing to a remote server. The authentication information is passed in the HTTP request.

#### CUPS-Authenticate-Job Request

The following groups of attributes are supplied as part of the CUPS-Authenticate-Job 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 of the IPP Model and Semantics document.
"printer-uri" (uri) and "job-id" (integer)
OR
"job-uri":
  The client MUST supply a URI for the specified printer and a job ID number, or the job URI.

Group 2: Job Attributes

"auth-info" (1setOf text(MAX)):CUPS 1.3
  The client OPTIONALLY supplies one or more authentication values as specified by the "auth-info-required" attribute.

#### CUPS-Authenticate-Job Response

The following groups of attributes are send as part of the CUPS-Authenticate-Job Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.

Group 2: Unsupported Attributes (status=client-eror-attributes-or-values-not-supported)

auth-info-required (1setOf Type2 keyword)
  The required authentication information.

### CUPS 1.3CUPS-Get-PPD Operation

The CUPS-Get-PPD operation (0x400F) gets a PPD file from the server. The PPD file can be specified using a `ppd-name` returned by `CUPS-Get-PPDs` or using the `printer-uri` for a queue.

If the PPD file is found, `successful-ok` is returned with the PPD file following the response data.

If the PPD file cannot be served by the local server because the `printer-uri` attribute points to an external printer, a `cups-see-other` status is returned with the correct URI to use.

If the PPD file does not exist, `client-error-not-found` is returned.

#### CUPS-Get-PPD Request

The following group of attributes is supplied as part of the CUPS-Get-PPD 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 of the IPP Model and Semantics document.
"printer-uri" (uri)
OR
"ppd-name" (name(255)):
  The client MUST supply a printer URI or PPD name.

#### CUPS-Get-PPD Response

The following group of attributes is sent as part of the CUPS-Get-PPD Response:

Group 1: Operation Attributes

Status Message:
  The standard response status message.
Natural Language and Character Set:
  The "attributes-charset" and "attributes-natural-language" attributes as described in section 3.1.4.2 of the IPP Model and Semantics document.
"printer-uri" (uri):
  The printer that provides the actual PPD file when the status code is cups-see-other (0x280)

If the status code is `successful-ok`, the PPD file follows the end of the IPP response.

## Attributes

CUPS provides many extension attributes to support multiple devices, PPD files, standard job filters, printers, and printer classes.

### Device Attributes

Device attributes are returned by the CUPS-Get-Devices operation and enumerate all of the available hardware devices and network protocols that are supported by the server.

#### device-class (type2 keyword)

The device-class attribute specifies the class of device and can be one of the following:

- "file" - a disk file.
- "direct" - a parallel or fixed-rate serial data port, currently used for Centronics, IEEE-1284, and USB printer ports.
- "serial" - a variable-rate serial port.
- "network" - a network connection, typically via AppSocket, HTTP, IPP, LPD, or SMB/CIFS protocols.

#### device-id (text(127))CUPS 1.2

The device-id attribute specifies the IEEE-1284 device ID string for the device.

#### device-info (text(127))

The device-info attribute specifies a human-readable string describing the device, e.g. "Parallel Port #1".

#### device-make-and-model (text(127))

The device-makr-and-model attribute specifies a device identification string provided by the printer connected to the device. If the device or printer does not support identification then this attribute contains the string "unknown".

#### device-uri (uri)

The device-uri attribute specifies a unique identifier for the device. The actual format of the device-uri string depends on the value of the device-class attribute:

- "file" - The device-uri will be of the form "file:///path/to/filename".
- "direct" - The device-uri will be of the form "scheme:/dev/filename" or "scheme://vendor/identifier", where scheme may be "parallel" or "usb" in the current implementation.
- "serial" - The device-uri will be of the form "serial:/dev/filename?baud=value+parity=value+flow=value". The baud value is the data rate in bits per second; the supported values depend on the underlying hardware. The parity value can be one of "none", "even", or "odd". The flow value can be one of "none", "soft" (XON/XOFF handshaking), "hard" or "rts/cts" (RTS/CTS handshaking), or "dtrdsr" (DTR/DSR handshaking).

  The URI returned by CUPS-Get-Devices will contain the maximum baud rate supported by the device and the best type of flow control available ("soft" or "hard").

- "network" - The device-uri will be of the form "scheme://[username:password@]hostname[:port]/[resource]", where scheme may be "http", "https", "ipp", "lpd", "smb", or "socket" in the current implementation.

  The URI returned by CUPS-Get-Devices will only contain the scheme name ("scheme"). It is up to the client application to add the appropriate host and other information when adding a new printer.

  The URI returned by Get-Printer-Attributes and CUPS-Get-Printers has any username and password information stripped; the information is still stored and used by the server internally to perform any needed authentication.

### Job Template Attributes

#### auth-info (1setOf text(MAX))CUPS 1.3

The auth-info attribute specifies the authentication information to use when printing to a remote device. The order and content of each text value is specifed by the auth-info-required printer attribute.

#### blackplot (boolean)

The blackplot attribute specifies whether HP-GL/2 plot files should be rendered entirely in black ink (blackplot=true) or using the colors and shades specified in the file (blackplot=false). The default value is false.

#### brightness (integer(0:200))

The brightness attribute specifies the overall brightness of the printed output in percent. A brightness of 100 is normal, while 200 is twice as bright and 50 is half as bright. The default value is 100.

Brightness is applied to the Cyan, Magenta, Yellow, and Black values using the function "f(x) = brightness / 100 * x".

#### columns (integer(1:4))

The columns attribute specifies the number of columns to generate when printing text files. The default value is 1.

#### cpi (type2 enum)

The cpi attribute specifies the number of characters per inch when printing text files. Only the values 10, 12, and 17 are currently supported. The default value is 10.

#### fitplot (boolean)

The fitplot attribute specifies whether to scale HP-GL/2 plot files to fit on the selected media (fitplot=true) or use the physical scale specified in the plot file (fitplot=false). The default value is false.

#### gamma (integer(1:10000))

The gamma attribute specifies the luminance correction for the output. A value of 1000 specifies no correction, while values of 2000 and 500 will generate lighter and darker output, respectively. The default value is 1000.

Gamma is applied to the Red, Green, and Blue values (or luminance for grayscale output) using the function "f(x) = x(1000/gamma)".

#### hue (integer(-180:180))

The hue attribute specifies a color hue rotation when printing image files. The default value is 0.

#### job-billing (text(MAX))CUPS 1.1

The job-billing attribute provides a text value to associate with a job for billing purposes.

#### job-hold-until (keyword | name(MAX))CUPS 1.1

The job-hold-until attribute specifies a hold time. In addition to the standard IPP/1.1 keyword names, CUPS supports name values of the form "HH:MM" and "HH:MM:SS" that specify a hold time. The hold time is in Universal Coordinated Time (UTC) and not in the local time zone. If the specified time is less than the current time, the job is held until the next day.

#### job-printer-state-message (text(MAX))CUPS 1.3

The job-printer-state-message attribute provides the last known value of the printer-state-message attribute for the printer that processed (or is processing) the job.

#### job-printer-state-reasons (1setOf type2 keyword)CUPS 1.3

The job-printer-state-reasons attribute provides the last known value of the printer-state-reasons attribute for the printer that processed (or is processing) the job.

#### job-sheets (1setof type3 keyword | name(MAX))CUPS 1.1

The job-sheets attribute specifies one or two banner files that are printed before and after a job. The reserved value of "none" disables banner printing. The default value is stored in the job-sheets-default attribute.

If only one value is supplied, the banner file is printed before the job. If two values are supplied, the first value is used as the starting banner file and the second as the ending banner file.

#### job-originating-host-name (name(MAX))

(CUPS 1.1.5 and higher)

The job-originating-host-name attribute specifies the host from which the job was queued. The value will be the hostname or IP address of the client depending on whether hostname resolution is enabled. The localhost address (127.0.0.1) is always resolved to the name "localhost".

This attribute is read-only.

#### lpi (type2 enum)

The lpi attribute specifies the number of lines per inch when printing text files. Only the values 6 and 8 are currently supported. The default value is 6.

#### mirror (boolean)

The mirror attribute specifies whether pages are mirrored on their X axis, which is useful for printing transfer images on special media. The default value is false.

#### natural-scaling (integer(1:1000))CUPS 1.1.9

The natural-scaling attribute specifies the scaling of image files with respect to the natural image size. A value of 100 specifies that the image file should exactly the natural size, while 50 is half the natural size and 200 is twice the natural size. The default value is 100.

The ppi option can be used to override the natural resolution of the image, which controls the natural size.

#### number-up-layout (type2 keyword)CUPS 1.1.15

The number-up-layout attribute specifies the order each input page is placed on each output page. The following keywords are presently defined:

- `btlr` - Bottom to top, left to right
- `btrl` - Bottom to top, right to left
- `lrbt` - Left to right, bottom to top
- `lrtb` - Left to right, top to bottom (default)
- `rlbt` - Right to left, bottom to top
- `rltb` - Right to left, top to bottom
- `tblr` - Top to bottom, left to right
- `tbrl` - Top to bottom, right to left

#### page-border (type2 keyword)CUPS 1.1.15

The page-border attribute specifies whether a border is draw around each page. The following keywords are presently defined:

- `double` - Two hairline borders are drawn
- `double-thick` - Two 1pt borders are drawn
- `none` - No border is drawn (default)
- `single` - A single hairline border is drawn
- `single-thick` - A single 1pt border is drawn

#### page-bottom (integer(0:MAX))

The page-bottom attribute specifies the bottom margin in points (72 points equals 1 inch). The default value is the device physical margin.

#### page-label (text(MAX))CUPS 1.1.7

The page-label attribute provides a text value to place in the header and footer on each page. If a classification level is set on the server, then this classification is printed before the page label.

#### page-left (integer(0:MAX))

The page-left attribute specifies the left margin in points (72 points equals 1 inch). The default value is the device physical margin.

#### page-right (integer(0:MAX))

The page-right attribute specifies the right margin in points (72 points equals 1 inch). The default value is the device physical margin.

#### page-set (type2 keyword)

The page-set attribute specifies which pages to print in a file. The supported keywords are "all", "even", and "odd". The default value is "all".

#### page-top (integer(0:MAX))

The page-top attribute specifies the top margin in points (72 points equals 1 inch). The default value is the device physical margin.

#### penwidth (integer(0:MAX))

The penwidth attribute specifies the default pen width in micrometers when printing HP-GL/2 plot files. The default value is 1000 (1 millimeter).

#### position (type2 keyword)

The position attribute specifies the location of image files on the media. The following keyword values are recognized:

- `center` - Center the image on the page (default)
- `top` - Print the image centered at the top of the page
- `left` - Print the image centered on the left of page
- `right` - Print the image centered on the right of the page
- `top-left` - Print the image at the top left corner of the page
- `top-right` - Print the image at the top right corner of the page
- `bottom` - Print the image centered at the bottom of the page
- `bottom-left` - Print the image at the bottom left corner of the page
- `bottom-right` - Print the image at the bottom right corner of the page

#### ppi (integer(1:MAX))

The ppi attribute specifies the resolution of an image file in pixels per inch. The default value is the resolution included with the file or 128 if no resolution information is available.

#### prettyprint (boolean)

The prettyprint attribute specifies whether text files should be printed with a shaded header and keyword highlighting (prettyprint=true) or without additional formatting (prettyprint=false). The default value is false.

#### saturation (integer(0:200))

The saturation attribute specifies the color saturation when printing image files. A saturation of 100 is normal, while values of 50 and 200 will be half and twice as colorful, respectively. The default value is 100.

#### scaling (integer(1:1000))

The scaling attribute specifies the scaling of image files with respect to the selected media. A value of 100 specifies that the image file should fit 100% of the page, or as much as possible given the image dimensions. The default value is unspecified.

The scaling attribute overrides the ppi attribute if specified.

#### wrap (boolean)

The wrap attribute specifies whether long lines should be wrapped (wrap=true) or not (wrap=false) when printing text files. The default value is true.

### PPD Attributes

#### ppd-device-id (text(127))

The ppd-device-id attribute specifies the IEEE-1284 device ID string for the device described by the PPD file.

#### ppd-make (text(127))

The ppd-make attribute specifies the manufacturer of the printer (the Manufacturer attribute in the PPD file). If the manufacturer is not specified in the PPD file then an educated guess is made using the NickName attribute in the PPD file.

#### ppd-make-and-model (text(127))

The ppd-make-and-model attribute specifies the manufacturer and model name of the PPD file (the NickName attribute in the PPD file). If the make and model is not specified in the PPD file then the ModelName or ShortNickName attributes are used instead.

#### ppd-model-number (integer)CUPS 1.3

The ppd-model-number attribute provides the `cupsModelNumber` value from the PPD file.

#### ppd-name (name(255))

The ppd-name attribute specifies either the PPD filename on the server relative to the model directory or a URI that maps to a specific driver interface in the driver directory. The forward slash (/) is used to delineate directories.

#### ppd-natural-language (1setOf naturalLanguage)

The ppd-natural-language attribute specifies the language encoding of the PPD file (the LanguageVersion attribute in the PPD file). If the language is unknown or undefined then "en" (English) is assumed.

#### ppd-product (1setOf text(127))

The ppd-product attribute specifies the Product attribute values in the PPD file.

#### ppd-psversion (1setOf text(127))CUPS 1.3

The ppd-product attribute specifies the PSVersion attribute values in the PPD file.

#### ppd-type (type1 keyword)CUPS 1.3

The ppd-type attribute specifies the type of driver described by the PPD file:

- `fax` - A facsimile or multi-function device
- `pdf` - A PDF printer
- `postscript` - A PostScript printer (no filters)
- `raster` - A CUPS raster driver
- `unknown` - An unknown or hybrid driver

### Printer Attributes

#### auth-info-required (1setOf type2 keyword)CUPS 1.3

The auth-info-required attribute specifies the authentication information that is required for printing a job. The following keywords are recognized:

- `domain` - A domain name is required.
- `none` - No authentication is required - this keyword can only appear by itself.
- `password` - A password is required.
- `username` - A username is required.

#### job-k-limit (integer)CUPS 1.1

The job-k-limit attribute specifies the maximum number of kilobytes that may be printed by a user, including banner files. The default value of 0 specifies that there is no limit.

#### job-page-limit (integer)CUPS 1.1

The job-page-limit attribute specifies the maximum number of pages that may be printed by a user, including banner files. The default value of 0 specifies that there is no limit.

#### job-quota-period (integer)CUPS 1.1

The job-quota-period attribute specifies the time period used for quota calculations, in seconds. The default value of 0 specifies that the limits apply to all jobs that have been printed by a user that are still known to the system.

#### job-sheets-supported (1setof type3 keyword | name(MAX))CUPS 1.1

The job-sheets-supported attribute specifies the available banner files. There will always be at least one banner file available called "none".

#### marker-change-time (integer)

The marker-change-time attribute specifies the printer-up-time value when the last change to the marker-colors, marker-levels, marker-names, or marker-types attributes was made.

#### marker-colors (1setof name(MAX))

The marker-colors attribute specifies the color(s) for each supply in the printer. It is only available when the driver provides supply levels. The color is either "none" or one or more hex-encoded sRGB colors of the form "#RRGGBB".

#### marker-levels (1setof integer(-1:100))

The marker-levels attribute specifies the current supply levels for the printer. It is only available when the driver provides supply levels. A value of -1 indicates the level is unknown, while values from 0 to 100 indicate the corresponding percentage.

#### marker-names (1setof name(MAX))

The marker-names attribute specifies the name(s) for each supply in the printer. It is only available when the driver provides supply levels.

#### marker-types (1setof type3 keyword)

The marker-types attribute specifies the type(s) of each supply in the printer. It is only available when the driver provides supply levels. The following (RFC 3805) types are currently supported:

- `toner`
- `wasteToner`
- `ink`
- `inkCartridge`
- `inkRibbon`
- `wasteInk`
- `opc`
- `developer`
- `fuserOil`
- `solidWax`
- `ribbonWax`
- `wasteWax`
- `fuser`
- `coronaWire`
- `fuserOilWick`
- `cleanerUnit`
- `fuserCleaningPad`
- `transferUnit`
- `tonerCartridge`
- `fuserOiler`
- `water`
- `wasteWater`
- `bindingSupply`
- `bandingSupply`
- `stichingWire`
- `shrinkWrap`
- `paperWrap`
- `staples`
- `inserts`
- `covers`

#### port-monitor" (name(127))

The port-monitor attribute specifies the port monitor to use when printing to this printer. The default port monitor is "none".

#### port-monitor-supported" (1setOf name(127))

The port-monitor-supported attribute specifies the available port monitors.

#### printer-type (type2 enum)

The printer-type attribute specifies printer type and capability bits for the printer or class. The default value is computed from internal state information and the PPD file for the printer. The following bits are defined:

Bit | Description
--- | ---
0x00000001 | Is a printer class.
0x00000002 | Is a remote destination.
0x00000004 | Can print in black.
0x00000008 | Can print in color.
0x00000010 | Can print on both sides of the page in hardware.
0x00000020 | Can staple output.
0x00000040 | Can do fast copies in hardware.
0x00000080 | Can do fast copy collation in hardware.
0x00000100 | Can punch output.
0x00000200 | Can cover output.
0x00000400 | Can bind output.
0x00000800 | Can sort output.
0x00001000 | Can handle media up to US-Legal/A4.
0x00002000 | Can handle media from US-Legal/A4 to ISO-C/A2.
0x00004000 | Can handle media larger than ISO-C/A2.
0x00008000 | Can handle user-defined media sizes.
0x00010000 | Is an implicit (server-generated) class.
0x00020000 | Is the a default printer on the network.
0x00040000 |  | Is a facsimile device.
0x00080000 | Is rejecting jobs.
0x00100000 | Delete this queue.
0x00200000 | Queue is not shared.
0x00400000 | Queue requires authentication.
0x00800000 | Queue supports CUPS command files.
0x01000000 | Queue was automatically discovered and added.

#### printer-type-mask (type2 enum)CUPS 1.1

The printer-type-mask attribute is used to choose printers or classes with the CUPS-Get-Printers and CUPS-Get-Classes operations. The bits are defined identically to the printer-type attribute and default to all 1's.

#### requesting-user-name-allowed (1setof name(127))CUPS 1.1

The requesting-user-name-allowed attribute lists all of the users that are allowed to access a printer or class. Either this attribute or the requesting-user-name-denied attribute will be defined, but not both.

#### requesting-user-name-denied (1setof name(127))CUPS 1.1

The requesting-user-name-denied attribute lists all of the users that are not allowed to access a printer or class. Either this attribute or the requesting-user-name-allowed attribute will be defined, but not both.

### Printer Class Attributes

#### member-names (1setof name(127))

The member-names attribute specifies each of the printer-name attributes of the member printers and classes. Each name corresponds to the same element of the member-uris attribute.

#### member-uris (1setof uri)

The member-uris attribute specifies each of the printer-uri attributes of the member printers and classes. Each URI corresponds to the same element of the member-names attribute.