draft-ietf-ipp-indp-method-05.txt   draft-ietf-ipp-indp-method-06.txt 
INTERNET-DRAFT Hugo Parra Internet Printing Protocol WG Hugo Parra
<draft-ietf-ipp-indp-method-05.txt> Novell, Inc. INTERNET-DRAFT Novell, Inc.
[Target Category: standards track] Tom Hastings <draft-ietf-ipp-indp-method-06.txt> Tom Hastings
Xerox Corp. Updates: RFC 2910 and 2911 Xerox Corp.
April 5, 2001 [Target Category: standards track] July 17, 2001
Expires: January 17, 2002
Internet Printing Protocol (IPP): Internet Printing Protocol (IPP):
The 'indp' Delivery Method for Event Notifications and Protocol/1.0 The 'indp' Delivery Method for Event Notifications and Protocol/1.0
Copyright (C) The Internet Society (2001). All Rights Reserved. Copyright (C) The Internet Society (2001). All Rights Reserved.
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of [RFC2026]. Internet-Drafts are all provisions of Section 10 of [RFC2026]. Internet-Drafts are
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http://www.ietf.org/ietf/1id-abstracts.txt http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed as The list of Internet-Draft Shadow Directories can be accessed as
http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
Abstract Abstract
This document describes an extension to the Internet Printing This document describes an extension to the Internet Printing
Protocol/1.0 (IPP) [RFC2566, RFC2565] and IPP/1.1 [RFC2911, RFC2910]. Protocol/1.0 (IPP) [RFC2566, RFC2565] and IPP/1.1 [RFC2911, RFC2910].
This document specifies the 'indp' Delivery Method and Protocol/1.0 This document specifies the 'indp' Delivery Method and Protocol/1.0
for use with the IPP Event Notification Specification [ipp-ntfy]. for use with the "IPP Event Notifications and Subscriptions"
specification [ipp-ntfy]. When IPP Notification [ipp-ntfy] is
supported, the Delivery Method defined in this document is one of the
RECOMMENDED Delivery Methods for Printers to support.
This Delivery Method is a simple protocol consisting of a single This Delivery Method is a simple protocol consisting of a single
operation: the Send-Notifications operation which uses the same operation: the Send-Notifications operation which uses the same
encoding and transport as IPP [RFC2565, RFC2910]. encoding and transport as IPP [RFC2565, RFC2910]. For this Delivery
Method, when an Event occurs, the Printer immediately sends (pushes)
For this Delivery Method, when an Event occurs, the Printer an Event Notification via the Send-Notifications operation to the
immediately sends (pushes) an Event Notification via the Send- Notification Recipient specified in the Subscription Object. The
Notifications operation to the Notification Recipient specified in Event Notification content consists of Machine Consumable attributes
the Subscription Object. The Event Notification content consists of and a Human Consumable "notify-text" attribute. The Notification
Machine Consumable attributes and a Human Consumable "notify-text" Recipient returns a response to the Printer.
attribute. The Notification Recipient returns a response to the
Printer.
Table of Contents Table of Contents
1 Introduction....................................................4 1 Introduction.....................................................5
2 Terminology.....................................................4 2 Terminology......................................................6
3 Model and Operation.............................................5 3 Model and Operation..............................................6
4 General Information.............................................6 4 General Information..............................................7
5 Subscription object attributes..................................9 5 Subscription object attributes..................................10
5.1 Subscription Template Attribute Conformance..................9 5.1 Subscription Template Attribute Conformance...................10
5.2 Additional Information about Subscription Template Attributes9 5.2 Additional Information about Subscription Template Attributes.10
5.2.1 notify-recipient-uri (uri).................................9 5.2.1 notify-recipient-uri (uri)..................................10
5.3 Subscription Description Attribute Conformance...............9 5.3 Subscription Description Attribute Conformance................10
6 Printer Description Attributes..................................9 6 New Values for Existing Printer Description Attributes..........11
6.1 Printer Description Attribute Conformance...................10 6.1 notify-schemes-supported (1setOf uriScheme)...................11
6.2 New Values for Existing Printer Description Attributes......10 6.2 operations-supported (1setOf type2 enum)......................11
6.2.1 notify-schemes-supported (1setOf uriScheme)...............10
6.2.2 operations-supported (1setOf type2 enum)..................10
7 Attributes Only in Event Notifications.........................10 7 Attributes Only in Event Notifications..........................11
8 Operations for Notification....................................11 8 Operations for Notification.....................................12
8.1 Send-Notifications operation................................11 8.1 Send-Notifications operation..................................12
8.1.1 Send-Notifications Request................................11 8.1.1 Send-Notifications Request..................................12
8.1.2 Send-Notifications Response...............................15 8.1.2 Send-Notifications Response.................................17
9 Status Codes...................................................16 9 Status Codes....................................................18
9.1 Additional Status Codes.....................................16 9.1 Additional Status Codes.......................................18
9.1.1 successful-ok-ignored-notifications (0x0004)..............17 9.1.1 successful-ok-ignored-notifications (0x0004)................19
9.1.2 client-error-ignored-all-notifications (0x0416)...........17 9.1.2 client-error-ignored-all-notifications (0x0416).............19
9.2 Status Codes returned in Event Notification Attributes Groups17 9.2 Status Codes returned in Event Notification Attributes Groups.19
9.2.1 client-error-not-found (0x0406)...........................17 9.2.1 client-error-not-found (0x0406).............................19
9.2.2 successful-ok-but-cancel-subscription (0x0006)............18 9.2.2 successful-ok-but-cancel-subscription (0x0006)..............20
10 Encoding and Transport.........................................18 10 Encoding and Transport.........................................20
10.1 Encoding of the Operation Layer.............................18 10.1 Encoding of the Operation Layer..............................20
10.2 Encoding of Transport Layer.................................18 10.2 Encoding of Transport Layer..................................20
11 Conformance Requirements.......................................18 11 Conformance Requirements.......................................20
11.1 Conformance Requirements for Printers.......................19 11.1 Conformance Requirements for Printers........................21
11.2 Conformance Requirements for INDP Notification Recipients...19 11.2 Conformance Requirements for INDP Notification Recipients....21
12 INDP URL Scheme................................................20 12 INDP URL Scheme................................................22
12.1 INDP URL Scheme Applicability and Intended Usage............20 12.1 INDP URL Scheme Applicability and Intended Usage.............22
12.2 INDP URL Scheme Associated INDP Port........................20 12.2 INDP URL Scheme Associated INDP Port.........................22
12.3 INDP URL Scheme Associated MIME Type........................20 12.3 INDP URL Scheme Associated MIME Type.........................22
12.4 INDP URL Scheme Character Encoding..........................20 12.4 INDP URL Scheme Character Encoding...........................22
12.5 INDP URL Scheme Syntax in ABNF..............................21 12.5 INDP URL Scheme Syntax in ABNF...............................23
12.5.1 INDP URL Examples.........................................22 12.5.1 INDP URL Examples..........................................23
12.5.2 INDP URL Comparisons......................................22 12.5.2 INDP URL Comparisons.......................................24
13 IANA Considerations............................................22 13 IANA Considerations............................................24
13.1 Operation Registrations.....................................23 13.1 Operation Registrations......................................25
13.2 Additional values of existing attributes....................23 13.2 Additional attribute value registrations for existing attributes
25
13.2.1 Additional values for the "notify-schemes-supported" Printer 13.2.1 Additional values for the "notify-schemes-supported" Printer
attribute..............................................23 attribute..............................................25
13.2.2 Additional values for the "operations-supported" Printer 13.2.2 Additional values for the "operations-supported" Printer
attribute..............................................24 attribute..............................................26
13.3 Status code Registrations...................................24 13.3 Status code Registrations....................................26
14 Internationalization Considerations............................24 14 Internationalization Considerations............................26
15 Security Considerations........................................24 15 Security Considerations........................................27
15.1 Security Conformance........................................25 15.1 Security Conformance.........................................27
16 References.....................................................25 16 References.....................................................28
17 Author's Addresses.............................................27 17 Author's Addresses.............................................29
18 Summary of Base IPP documents..................................27 18 Summary of Base IPP documents..................................30
19 Full Copyright Statement.......................................29 19 Full Copyright Statement.......................................32
Tables Tables
Table 1 - Information about the Delivery Method....................7 Table 1 - Information about the Delivery Method....................8
Table 2 - Operation-id assignments................................10 Table 2 - Operation-id assignments................................11
Table 3 - Attributes in Event Notification Content................13 Table 3 - Attributes in Event Notification Content................15
Table 4 - Additional Attributes in Event Notification Content for Job Table 4 - Additional Attributes in Event Notification Content for Job
Events ........................................................14 Events ........................................................16
Table 5 - Combinations of Events and Subscribed Events for "job- Table 5 - Combinations of Events and Subscribed Events for "job-
impressions-completed" ........................................14 impressions-completed" ........................................16
Table 6 - Additional Attributes in Event Notification Content for Table 6 - Additional Attributes in Event Notification Content for
Printer Events ................................................15 Printer Events ................................................17
Table 7 - The "event-notification-attributes-tag" value...........18 Table 7 - The "event-notification-attributes-tag" value...........20
1 Introduction 1 Introduction
The "IPP Event Notification Specification" document [ipp-ntfy] The "IPP Event Notifications and Subscriptions" document [ipp-ntfy]
defines an extension to Internet Printing Protocol/1.0 (IPP) defines an OPTIONAL extension to Internet Printing Protocol/1.0 (IPP)
[RFC2566, RFC2565] and IPP/1.1 [RFC2911, RFC2910]. This extension [RFC2566, RFC2565] and IPP/1.1 [RFC2911, RFC2910] (for a description
defines operations that a client can perform in order to create of the base IPP documents, see section 18). That extension defines
Subscription Objects in a Printer and carry out other operations on operations that a client can perform in order to create Subscription
them. A Subscription Object represents a Subscription abstraction. Objects in a Printer and carry out other operations on them. A
A client associates Subscription Objects with a particular Job by Subscription Object represents a Subscription abstraction. A client
performing the Create-Job-Subscriptions operation or by submitting a associates Subscription Objects with a particular Job by performing
Job with subscription information. A client associates Subscription the Create-Job-Subscriptions operation or by submitting a Job with
Objects with the Printer by performing a Create-Printer-Subscriptions subscription information. A client associates Subscription Objects
with the Printer by performing a Create-Printer-Subscriptions
operation. Four other operations are defined for Subscription operation. Four other operations are defined for Subscription
Objects: Get-Subscriptions-Attributes, Get-Subscriptions, Renew- Objects: Get-Subscriptions-Attributes, Get-Subscriptions, Renew-
Subscription, and Cancel-Subscription. The Subscription Object Subscription, and Cancel-Subscription. The Subscription Object
specifies that when one of the specified Events occurs, the Printer specifies that when one of the specified Events occurs, the Printer
sends an asynchronous Event Notification to the specified sends an asynchronous Event Notification to the specified
Notification Recipient via the specified Delivery Method (i.e., Notification Recipient via the specified Delivery Method (i.e.,
protocol). protocol).
The "IPP Event Notification Specification" document [ipp-ntfy] The "IPP Event Notifications and Subscriptions" document [ipp-ntfy]
specifies that each Delivery Method is defined in another document. specifies that each Delivery Method is defined in another document.
This document is one such document, and it specifies the 'indp' This document is one such document, and it specifies the 'indp'
Delivery Method. This Delivery Method is a simple protocol Delivery Method. When IPP Notification [ipp-ntfy] is supported, the
consisting of a single operation: the Send-Notifications operation Delivery Method defined in this document is one of the RECOMMENDED
which uses the same encoding and transport as IPP. This document Delivery Methods for Printers to support. This Delivery Method is a
defines version '1.0' of the protocol. simple protocol consisting of a single operation: the Send-
Notifications operation which uses the same encoding and transport as
IPP. This document defines version '1.0' of the protocol.
For the 'indp' Delivery Method, an IPP Printer sends (pushes) a Send- For the 'indp' Delivery Method, an IPP Printer sends (pushes) a Send-
Notifications operation request containing one or more Event Notifications operation request containing one or more Event
Notifications to the Notification Recipient specified in the Notifications to the Notification Recipient specified in the
Subscription Object. The Event Notification content consists of Subscription Object. The Event Notification content consists of
Machine Consumable attributes and a Human Consumable "notify-text" Machine Consumable attributes and a Human Consumable "notify-text"
attribute. attribute.
The Notification Recipient receives the Event Notification as a Send- The Notification Recipient receives the Event Notification as a Send-
Notifications operation, in the same way as an IPP Printer receives Notifications operation, in the same way as an IPP Printer receives
IPP operations. The Notification Recipient returns a response to the IPP operations. The Notification Recipient returns a response to the
Printer. Printer.
2 Terminology 2 Terminology
This section defines the following terms that are used throughout This section defines the following terms that are used throughout
this document: this document:
Terms such as attributes, keywords, and support. These terms have This document uses the same terminology as [RFC2911], such as
special meaning and are defined in the model terminology "client", "Printer", "attribute", "attribute value", "keyword",
[RFC2911] section 12.2. "operation", "request", "response", and "support".
Capitalized terms, such as MUST, MUST NOT, REQUIRED, SHOULD, Capitalized terms, such as MUST, MUST NOT, REQUIRED, SHOULD,
SHOULD NOT, MAY, NEED NOT, and OPTIONAL, have special SHOULD NOT, MAY, NEED NOT, and OPTIONAL, have special meaning
meaning relating to conformance as specified in RFC 2119 relating to conformance as defined in RFC 2119 [RFC2119] and
[RFC2119] and [RFC2911] section 12.1. These terms refer to [RFC2911] section 12.1. If an implementation supports the
conformance to this document, if this document is extension defined in this document, then these terms apply;
implemented. otherwise, they do not. These terms define conformance to this
document only; they do not affect conformance to other documents,
Capitalized terms, such as Notification Recipient, Event unless explicitly stated otherwise.
Notification, Printer, etc., that are defined in [ipp-ntfy]
with the same meanings and are not reproduced here.
Event Notification Attributes Group - The attributes group in a Event Notification Attributes Group - The attributes group in a
request that contains Event Notification Attributes in a request that contains Event Notification Attributes in a
request or response. request or response.
Other capitalized terms, such as Notification Recipient, Event
Notification, Compound Event Notification, Printer, etc., are
defined in [ipp-ntfy], have the same meanings, and are not
reproduced here.
3 Model and Operation 3 Model and Operation
See [ipp-ntfy] for the description of the Event Notification Model See [ipp-ntfy] for the description of the Event Notification Model
and Operation. This Delivery Method takes advantage of combining and Operation. This Delivery Method takes advantage of combining
several Event Notifications into a single Compound Event Notification several Event Notifications into a single Compound Event Notification
that is delivery by a single Send-Notification operation to a single that is delivery by a single Send-Notification operation to a single
Notification Recipient. Notification Recipient.
When creating each Subscription object, the client supplies the When creating each Subscription object, the client supplies the
"notify-recipient" (uri) Subscription Template attribute. The "notify-recipient" (uri) Subscription Template attribute. The
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recipient-uri" attribute value (see section 5.2.1). recipient-uri" attribute value (see section 5.2.1).
If several events occur sufficiently close to one another for the If several events occur sufficiently close to one another for the
same or different Subscription objects, but with the same same or different Subscription objects, but with the same
Notification Recipient, the Printer MAY combine them into a single Notification Recipient, the Printer MAY combine them into a single
Send-Notifications request using a separate Event Notification Send-Notifications request using a separate Event Notification
Attributes group for each event (see section 8.1.1). Attributes group for each event (see section 8.1.1).
4 General Information 4 General Information
If a Printer supports this Delivery Method, Table 1 lists its If a client or Printer supports this Delivery Method, Table 1 lists
characteristics. its characteristics.
Table 1 - Information about the Delivery Method Table 1 - Information about the Delivery Method
Document Method conformance 'indp' realization Document Method conformance 'indp' realization
requirement requirement
1. What is the URL scheme name indp 1. What is the URL scheme name indp
for the Delivery Method? for the Delivery Method?
2. Is the Delivery Method is RECOMMENDED 2. Is the Delivery Method is
REQUIRED, RECOMMENDED, or REQUIRED, RECOMMENDED, or
OPTIONAL for an IPP Printer to OPTIONAL for an IPP Printer to
support? support? RECOMMENDED
3. What transport and delivery A Printer MUST support a 3. What transport and delivery
protocol does the Printer use complete HTTP/1.1 stack protocol does the Printer use complete HTTP/1.1 stack
to deliver the Event [RFC2616] to deliver the Event [RFC2616]
Notification content, i.e., Notification content, i.e.,
what is the entire network what is the entire network
stack? stack? A Printer MUST support a
4. Can several Event A Printer implementation MAY 4. Can several Event A Printer implementation MAY
Notifications be combined into combine several Event Notifications be combined into combine several Event
a Compound Event Notification? Notifications into a single a Compound Event Notification? Notifications into a single
Event Notifications request as Event Notifications request as
separate Event Notification separate Event Notification
Attributes Groups, see section Attributes Groups, see section
8.1.1 8.1.1
5. Is the Delivery Method This Delivery Method is a push. 5. Is the Delivery Method This Delivery Method is a push.
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7. What section in this document The representation and encoding 7. What section in this document The representation and encoding
answers the following is the same as IPP. See answers the following is the same as IPP. See
question? For a Machine section 8.1.1 question? For a Machine section 8.1.1
Consumable Event Notification, Consumable Event Notification,
what is the representation and what is the representation and
encoding of values defined in encoding of values defined in
section 9.1 of [ipp-ntfy] and section 9.1 of [ipp-ntfy] and
the conformance requirements the conformance requirements
thereof? For a Human thereof? For a Human
Consumable Event Notification,
Document Method conformance 'indp' realization Document Method conformance 'indp' realization
requirement requirement
thereof? For a Human
Consumable Event Notification,
what is the representation and what is the representation and
encoding of pieces of encoding of pieces of
information defined in section information defined in section
9.2 of [ipp-ntfy] and the 9.2 of [ipp-ntfy] and the
conformance requirements conformance requirements
thereof? thereof?
8. What are the latency and 8. What are the latency and
reliability of the transport itselfs(see [RFC2911]).IPP/1.1 reliability of the transport itself (see [RFC2911]).
and delivery protocol? and delivery protocol? Same as for IPP/1.0 or IPP/1.1
9. What are the security aspects 15 9. What are the security aspects See section 15
of the transport and delivery of the transport and delivery
protocol, e.g., how it is See section protocol, e.g., how it is
handled in firewalls? handled in firewalls?
10. What are the content length They are the same as for 10. What are the content length They are the same as for
restrictions? IPP/1.0 and IPP/1.1 itself (see restrictions? IPP/1.0 and IPP/1.1 itself (see
[RFC2911]). [RFC2911]).
11. What are the additional values A new Event Notifications 11. What are the additional values A new Event Notifications
or pieces of information that attribute group (see section or pieces of information that attribute group (see section
a Printer sends in an Event 10.1) and additional status a Printer sends in an Event 10.1) and additional status
Notification and the codes for use in the response Notification and the codes for use in the response
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Notification operation. See section 12 for a complete Notification operation. See section 12 for a complete
definition of the syntax of the INDP URL. definition of the syntax of the INDP URL.
5.3 Subscription Description Attribute Conformance 5.3 Subscription Description Attribute Conformance
The 'indp' Delivery Method has the same conformance requirements for The 'indp' Delivery Method has the same conformance requirements for
Subscription Description attributes as defined in [ipp-ntfy]. The Subscription Description attributes as defined in [ipp-ntfy]. The
'indp' Delivery Method does not define any addition Subscription 'indp' Delivery Method does not define any addition Subscription
Description attributes. Description attributes.
6 Printer Description Attributes 6 New Values for Existing Printer Description Attributes
This section defines the Printer Description Attributes conformance
requirements for Printers.
6.1 Printer Description Attribute Conformance
The 'indp' Delivery Method has the same conformance requirements for
Printer Description attributes as defined in [ipp-ntfy]. The 'indp'
Delivery Method does not define any addition Printer Description
attributes.
6.2 New Values for Existing Printer Description Attributes
This section defines additional values for existing Printer This Delivery Method does not define any additional Printer
Description attributes. Description attribute from those defined in [ipp-ntfy]. However, it
does define additional values for existing Printer Description
attributes defined in [ipp-ntfy]. This section defines those
additional values.
6.2.1 notify-schemes-supported (1setOf uriScheme) 6.1 notify-schemes-supported (1setOf uriScheme)
The following "notify-schemes-supported" value is added in order to The following value of the "notify-schemes-supported" Printer
support the new Delivery Method defined in this document: attribute (see [ipp-ntfy] section 5.3.1) is added in order to support
the new Delivery Method defined in this document:
'indp' - The IPP Notification Delivery Method defined in this 'indp' - The IPP Notification Delivery Method defined in this
document. document.
6.2.2 operations-supported (1setOf type2 enum) 6.2 operations-supported (1setOf type2 enum)
Table 2 lists the "operation-id" value added in order to support the Table 2 lists the value of the "operation-id" operation parameter
(see [RFC2911]) and the value of the "operations-supported" Printer
Description attribute (see [RFC2911]) added in order to support the
new operation defined in this document. The operation-id is assigned new operation defined in this document. The operation-id is assigned
in the same name space as other operations that a Printer supports. in the same name space as other operations that a Printer supports.
However, a Printer MUST NOT include this value in its "operations- However, a Printer MUST NOT include this value in its "operations-
supported" attribute unless it can accept the Send-Notifications supported" attribute unless it can accept the Send-Notifications
request. request.
Table 2 - Operation-id assignments Table 2 - Operation-id assignments
Value Operation Name Value Operation Name
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No additional attributes are defined only for use in Event No additional attributes are defined only for use in Event
Notifications besides those defined in [ipp-ntfy]. Notifications besides those defined in [ipp-ntfy].
8 Operations for Notification 8 Operations for Notification
This section defines the operation for Event Notification using the This section defines the operation for Event Notification using the
'indp' Delivery Method. 'indp' Delivery Method.
There is only one operation defined: Send-Notifications. Section There is only one operation defined: Send-Notifications. Section
6.2.2 assigns of the "operation-id" for the Send-Notifications 6.2 assigns of the "operation-id" for the Send-Notifications
operation and the following section defined the operation. operation and the following section defined the operation.
8.1 Send-Notifications operation 8.1 Send-Notifications operation
This REQUIRED operation allows a Printer to send one or more Event This REQUIRED operation allows a Printer to send one or more Event
Notifications to a Notification Recipient using HTTP. Notifications to a Notification Recipient using HTTP.
The Printer composes the information defined for an IPP Notification The Printer composes the information defined for an IPP Notification
[ipp-ntfy] and sends it using the Sent-Notifications operation to the [ipp-ntfy] and sends it using the Send-Notifications operation to the
Notification Recipient supplied in the Subscription object. Notification Recipient supplied in the Subscription object. The
ordering of separate Send-Notifications operations that a Printer
sends MUST follow the "Event Notification Ordering" requirements in
[ipp-ntfy] section 9.
The Send-Notifications operation uses the operations model defined by The Send-Notifications operation uses the operations model defined by
IPP [RFC2566]. This includes, the use of a URI as the identifier for IPP [RFC2566]. This includes, the use of a URI as the identifier for
the target of each operation, the inclusion of a version number, the target of each operation, the inclusion of a version number,
operation-id, and request-id in each request, and the definition of operation-id, and request-id in each request, and the definition of
attribute groups. The Send-Notifications operation uses the Operation attribute groups. The Send-Notifications operation uses the Operation
Attributes group, but currently has no need for the Unsupported Attributes group, but currently has no need for the Unsupported
Attributes, Printer Object Attributes, and Job-Object Attributes Attributes, Printer Object Attributes, and Job-Object Attributes
groups. However, it uses a new attribute group, the Event groups. However, it uses a new attribute group, the Event
Notification Attributes group. Notification Attributes group.
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Target: Target:
A copy of the Subscription object's "notify-recipient-uri" A copy of the Subscription object's "notify-recipient-uri"
(uri) attribute which is the target of this operation as (uri) attribute which is the target of this operation as
described in [RFC2911] section 3.1.5, i.e., the URI of the described in [RFC2911] section 3.1.5, i.e., the URI of the
'indp' Notification Recipient (see section 5.2.1). 'indp' Notification Recipient (see section 5.2.1).
Group 2 to N: Event Notification Attributes Group 2 to N: Event Notification Attributes
In each group 2 to N, each attribute is encoded using the IPP In each group 2 to N, each attribute is encoded using the IPP
rules for encoding attributes [RFC2910] and may be encoded in rules for encoding attributes [RFC2910] and the attributes
any order. Note: the Get-Jobs response in [RFC2911] acts as a within a group MAY be encoded in any order. Note: the Get-Jobs
model for encoding multiple groups of attributes. response in [RFC2911] acts as a model for encoding multiple
groups of attributes. The entire request is considered a
single Compound Event Notification and MUST follow the "Event
Notification Ordering" requirements for Event Notifications
within a Compound Event Notification specified in [ipp-ntfy]
section 9.
Each Event Notification Group MUST contain all of attributes Each Event Notification Group MUST contain all of attributes
specified in [ipp-ntfy] section 9.1 ("Content of Machine specified in [ipp-ntfy] section 9.1 ("Content of Machine
Consumable Event Notifications") with exceptions denoted by Consumable Event Notifications") with exceptions denoted by
asterisks in the tables below. asterisks in the tables below.
The tables below are copies of the tables in [ipp-ntfy] section The tables below are copies of the tables in [ipp-ntfy] section
9.1 ("Content of Machine Consumable Event Notifications") 9.1 ("Content of Machine Consumable Event Notifications")
except that each cell in the "Sends" column is a "MUST". except that each cell in the "Sends" column is a "MUST".
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Printer doesn't support the "notify-attributes" attribute, it Printer doesn't support the "notify-attributes" attribute, it
is not present on the associated Subscription Object and the is not present on the associated Subscription Object and the
Printer does not send any client-requested attributes. Printer does not send any client-requested attributes.
For Event Notifications for Job Events, the Printer sends the For Event Notifications for Job Events, the Printer sends the
following additional attributes shown in Table 4. following additional attributes shown in Table 4.
Table 4 - Additional Attributes in Event Notification Content for Table 4 - Additional Attributes in Event Notification Content for
Job Events Job Events
Source Value Sends Source Object Source Value Sends Source
Object
job-id (integer(1:MAX)) MUST Job job-id (integer(1:MAX)) MUST Job
job-state (type1 enum) MUST Job job-state (type1 enum) MUST Job
job-state-reasons (1setOf type2 keyword) MUST Job job-state-reasons (1setOf type2 keyword) MUST Job
job-impressions-completed MUST * Job job-impressions-completed (integer(0:MAX)) MUST * Job
(integer(0:MAX))
* The Printer MUST send the "job-impressions-completed" * The Printer MUST send the "job-impressions-completed"
attribute in an Event Notification only for the combinations of attribute in an Event Notification only for the combinations of
Events and Subscribed Events shown in Table 5. Events and Subscribed Events shown in Table 5.
Table 5 - Combinations of Events and Subscribed Events for "job- Table 5 - Combinations of Events and Subscribed Events for "job-
impressions-completed" impressions-completed"
Job Event Subscribed Job Event Job Event Subscribed Job Event
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Tag Value (Hex) Meaning Tag Value (Hex) Meaning
0x07 "event-notification-attributes-tag" 0x07 "event-notification-attributes-tag"
10.2 Encoding of Transport Layer 10.2 Encoding of Transport Layer
The 'indp' Notification Delivery Method uses the IPP transport layer The 'indp' Notification Delivery Method uses the IPP transport layer
encoding described in [RFC2910]. encoding described in [RFC2910].
It is REQUIRED that an 'indp' Notification Recipient implementation It is REQUIRED that an 'indp' Notification Recipient implementation
support HTTP over the IANA assigned Well Known Port assigned to the support HTTP over the IANA-assigned well known system port assigned
'indp' Delivery Method as its default port by IANA (see section 13), to the 'indp' Delivery Method as its default port by IANA (see
though a Notification Recipient implementation MAY support HTTP over section 13), though a Notification Recipient implementation MAY
some other port as well. support HTTP over some other port as well.
11 Conformance Requirements 11 Conformance Requirements
This section defines conformance requirements for Printers and This section defines conformance requirements for Printers and
Notification Recipients. Notification Recipients.
11.1 Conformance Requirements for Printers 11.1 Conformance Requirements for Printers
The 'indp' Delivery Method is RECOMMENDED for a Printer to support. The 'indp' Delivery Method is RECOMMENDED for a Printer to support.
skipping to change at page 19, line 29 skipping to change at page 21, line 29
object attributes defined in section 6. object attributes defined in section 6.
4.MUST support the 'indp' protocol by sending Event Notifications 4.MUST support the 'indp' protocol by sending Event Notifications
using the Send-Notifications operation defined in section 8.1. using the Send-Notifications operation defined in section 8.1.
5.MUST send INDP URLs (e.g., in the "notify-recipient-uri" attribute 5.MUST send INDP URLs (e.g., in the "notify-recipient-uri" attribute
in 'Send-Notifications') that conform to the ABNF specified in in 'Send-Notifications') that conform to the ABNF specified in
section 12.5 of this document; section 12.5 of this document;
6.MUST send the Send-Notifications operation via the port specified 6.MUST send the Send-Notifications operation via the port specified
in the INDP URL (if present) or otherwise via IANA assigned well- in the INDP URL (if present) or otherwise via the IANA-assigned
known port [TBD]; well-known system port xxx [TBA by IANA];
7.MUST convert INDP URLs for use in the Send-Notifications operation 7.MUST convert INDP URLs for use in the Send-Notifications operation
to their corresponding HTTP URL forms for use in the HTTP layer by to their corresponding HTTP URL forms for use in the HTTP layer by
the same rules used to convert IPP URLs to their corresponding the same rules used to convert IPP URLs to their corresponding
HTTP URL forms (see section 5 'IPP URL Scheme' in [RFC2910]). HTTP URL forms (see section 5 'IPP URL Scheme' in [RFC2910]).
11.2 Conformance Requirements for INDP Notification Recipients 11.2 Conformance Requirements for INDP Notification Recipients
INDP Notification Recipients that conform to this specification: INDP Notification Recipients that conform to this specification:
1.MUST accept Send-Notifications requests and return Send- 1.MUST accept Send-Notifications requests and return Send-
Notifications responses as defined in sections 8 and 9. Notifications responses as defined in sections 8 and 9.
2.SHOULD reject received INDP URLs in "application/ipp" request 2.SHOULD reject received INDP URLs in "application/ipp" request
bodies (e.g., in the "notify-recipient-uri" attribute in 'Send- bodies (e.g., in the "notify-recipient-uri" attribute in 'Send-
Notifications') that do not conform to the ABNF for INDP URLs Notifications') that do not conform to the ABNF for INDP URLs
specified in section 12.5 of this document; specified in section 12.5 of this document;
3.MUST listen for INDP operations on IANA-assigned well-known port 3.MUST listen for INDP operations on IANA-assigned well-known system
[TBD], unless explicitly configured by system administrators or port xxx [TBA by IANA], unless explicitly configured by system
site policies; administrators or site policies;
4.SHOULD NOT listen for INDP operations on any other port, unless 4.SHOULD NOT listen for INDP operations on any other port, unless
explicitly configured by system administrators or site policies. explicitly configured by system administrators or site policies.
12 INDP URL Scheme 12 INDP URL Scheme
12.1 INDP URL Scheme Applicability and Intended Usage 12.1 INDP URL Scheme Applicability and Intended Usage
This section is intended for use in registering the "indp" URL scheme This section is intended for use in registering the "indp" URL scheme
with IANA and fully conforms to the requirements in [RFC2717]. This with IANA and fully conforms to the requirements in [RFC2717]. This
document defines the "indp" URL (Uniform Resource Locator) scheme for document defines the "indp" URL (Uniform Resource Locator) scheme for
specifying the location of an INDP Notification Recipient object specifying the location of an INDP Notification Recipient object
which implements IPP Notification Delivery Protocol (INDP) specified which implements IPP Notification Delivery Protocol (INDP) specified
in this document. in this document.
The intended usage of the "indp" URL scheme is COMMON. The intended usage of the "indp" URL scheme is COMMON.
12.2 INDP URL Scheme Associated INDP Port 12.2 INDP URL Scheme Associated INDP Port
All INDP URLs which do NOT explicitly specify a port MUST be used All INDP URLs which do NOT explicitly specify a port MUST be used
over IANA-assigned well-known port [TBD] for the INDP protocol. over IANA-assigned well-known system port xxx [TBA by IANA] for the
INDP protocol.
See: IANA Port Numbers Registry [IANA-PORTREG]. See: IANA Port Numbers Registry [IANA-PORTREG].
12.3 INDP URL Scheme Associated MIME Type 12.3 INDP URL Scheme Associated MIME Type
All INDP protocol operations (requests and responses) MUST be All INDP protocol operations (requests and responses) MUST be
conveyed in an "application/ipp" MIME media type as registered in conveyed in an "application/ipp" MIME media type as registered in
[IANA-MIMEREG]. INDP URLs MUST refer to INDP Notification Recipient [IANA-MIMEREG]. INDP URLs MUST refer to INDP Notification Recipient
objects which support this "application/ipp" MIME media type. objects which support this "application/ipp" MIME media type.
skipping to change at page 21, line 7 skipping to change at page 23, line 7
the HTTP URL scheme defined in HTTP/1.1 [RFC2616], which is derived the HTTP URL scheme defined in HTTP/1.1 [RFC2616], which is derived
from the URI Generic Syntax [RFC2396] and further updated by from the URI Generic Syntax [RFC2396] and further updated by
[RFC2732] and [RFC2373] (for IPv6 addresses in URLs). The INDP URL [RFC2732] and [RFC2373] (for IPv6 addresses in URLs). The INDP URL
scheme is case-insensitive in the 'scheme' and 'host' (host name or scheme is case-insensitive in the 'scheme' and 'host' (host name or
host address) part; however the 'abs_path' part is case-sensitive, as host address) part; however the 'abs_path' part is case-sensitive, as
in [RFC2396]. Code points outside [US-ASCII] MUST be hex escaped by in [RFC2396]. Code points outside [US-ASCII] MUST be hex escaped by
the mechanism specified in [RFC2396]. the mechanism specified in [RFC2396].
12.5 INDP URL Scheme Syntax in ABNF 12.5 INDP URL Scheme Syntax in ABNF
This section is intended for use in registering the "indp" URL scheme
with IANA and fully conforms to the requirements in [RFC2717]. This
document defines the "indp" URL (Uniform Resource Locator) scheme for
specifying the location of an INDP Notification Recipient object
which implements IPP Notification Delivery Protocol (INDP) specified
in this document.
The intended usage of the "indp" URL scheme is COMMON.
The IPP protocol places a limit of 1023 octets (NOT characters) on The IPP protocol places a limit of 1023 octets (NOT characters) on
the length of a URI (see section 4.1.5 'uri' in [RFC2911]). An INDP the length of a URI (see section 4.1.5 'uri' in [RFC2911]). An INDP
Notification Recipient MUST return 'client-error-request-value-too- Notification Recipient MUST return 'client-error-request-value-too-
long' (see section 13.1.4.10 in [RFC2911]) when a URI received in a long' (see section 13.1.4.10 in [RFC2911]) when a URI received in a
request is too long. request is too long.
Note: INDP Notification Recipients ought to be cautious about Note: INDP Notification Recipients ought to be cautious about
depending on URI lengths above 255 bytes, because some older client depending on URI lengths above 255 bytes, because some older client
or proxy implementations might not properly support these lengths. or proxy implementations might not properly support these lengths.
skipping to change at page 21, line 38 skipping to change at page 23, line 29
information on URL syntax and semantics, see "Uniform Resource information on URL syntax and semantics, see "Uniform Resource
Identifiers (URI): Generic Syntax and Semantics" [RFC2396]. This Identifiers (URI): Generic Syntax and Semantics" [RFC2396]. This
specification adopts the definitions of "port", "host", "abs_path", specification adopts the definitions of "port", "host", "abs_path",
and "query" from [RFC2396], as updated by [RFC2732] and [RFC2373] and "query" from [RFC2396], as updated by [RFC2732] and [RFC2373]
(for IPv6 addresses in URLs). (for IPv6 addresses in URLs).
The INDP URL scheme syntax in ABNF is as follows: The INDP URL scheme syntax in ABNF is as follows:
indp_URL = "indp:" "//" host [ ":" port ] [ abs_path [ "?" query ]] indp_URL = "indp:" "//" host [ ":" port ] [ abs_path [ "?" query ]]
If the port is empty or not given, IANA-assigned well-known port If the port is empty or not given, IANA-assigned well-known system
[TBD] is assumed. The semantics are that the identified resource port xxx [TBA by IANA] is assumed. The semantics are that the
(see section 5.1.2 of [RFC2616]) is located at the INDP Notification identified resource (see section 5.1.2 of [RFC2616]) is located at
Recipient listening for HTTP connections on that port of that host, the INDP Notification Recipient listening for HTTP connections on
and the Request-URI for the identified resource is 'abs_path'. that port of that host, and the Request-URI for the identified
resource is 'abs_path'.
Note: The use of IP addresses in URLs SHOULD be avoided whenever Note: The use of IP addresses in URLs SHOULD be avoided whenever
possible (see [RFC1900]). possible (see [RFC1900]).
If the 'abs_path' is not present in the URL, it MUST be given as "/" If the 'abs_path' is not present in the URL, it MUST be given as "/"
when used as a Request-URI for a resource (see section 5.1.2 of when used as a Request-URI for a resource (see section 5.1.2 of
[RFC2616]). If a proxy receives a host name which is not a fully [RFC2616]). If a proxy receives a host name which is not a fully
qualified domain name, it MAY add its domain to the host name it qualified domain name, it MAY add its domain to the host name it
received. If a proxy receives a fully qualified domain name, the received. If a proxy receives a fully qualified domain name, the
proxy MUST NOT change the host name. proxy MUST NOT change the host name.
skipping to change at page 22, line 44 skipping to change at page 24, line 37
indp://[::192.9.5.5]/listener indp://[::192.9.5.5]/listener
indp://[::FFFF:129.144.52.38]/listener indp://[::FFFF:129.144.52.38]/listener
indp://[2010:836B:4179::836B:4179]/listeners/tom indp://[2010:836B:4179::836B:4179]/listeners/tom
12.5.2 INDP URL Comparisons 12.5.2 INDP URL Comparisons
When comparing two INDP URLs to decide if they match or not, the When comparing two INDP URLs to decide if they match or not, the
comparer MUST use the same rules as those defined for HTTP URI comparer MUST use the same rules as those defined for HTTP URI
comparisons in [RFC2616], with the sole following exception: comparisons in [RFC2616], with the sole following exception:
. A port that is empty or not given MUST be treated as equivalent ? A port that is empty or not given MUST be treated as equivalent
to the well-known port for that INDP URL (port [TBD]); to the well-known system port xxx [TBA by IANA] for that INDP
URL;
13 IANA Considerations 13 IANA Considerations
IANA is requested to register the indp URL scheme as defined in IANA shall register the indp URL scheme as defined in section 12
section 12. according to the procedures of [RFC2717] and assign a well-known
system port.
IANA is requested to assign a default system port (less than 1024)
for use with the indp URL as defined in section 12.
The rest of this section contains the exact information for IANA to The rest of this section contains the exact information for IANA to
add to the IPP Registries according to the procedures defined in RFC add to the IPP Registries according to the procedures defined in RFC
2911 [RFC2911] section 6. 2911 [RFC2911] section 6.
Note to RFC Editors: Replace RFC NNNN below with the RFC number Note to RFC Editors: Replace RFC NNNN below with the RFC number
for this document, so that it accurately reflects the content of for this document, so that it accurately reflects the content of
the information for the IANA Registry. the information for the IANA Registry.
13.1 Operation Registrations 13.1 Operation Registrations
The operations defined in this document will be published by IANA The following table lists the operation defined in this document.
according to the procedures in RFC 2911 [RFC2911] section 6.4 with This is to be registered according to the procedures in RFC 2911
the following path: [RFC2911] section 6.4.
ftp.isi.edu/iana/assignments/ipp/operations/ Operations: Ref.
Section:
Send-Notifications operation RFC NNNN 8.1
The registry entry will contain the following information: The resulting operation registration will be published in the
ftp://ftp.iana.org/in-notes/iana/assignments/ipp/operations/
area.
Operations: Ref. Section: 13.2 Additional attribute value registrations for existing attributes
Send-Notifications operation RFC NNNN 8.1
13.2 Additional values of existing attributes This section lists additional attribute value registrations for use
with existing attributes defined in other documents.
13.2.1 Additional values for the "notify-schemes-supported" Printer 13.2.1 Additional values for the "notify-schemes-supported" Printer
attribute attribute
The "notify-schemes-supported" uriScheme attribute value defined in The following table lists the uriScheme value defined in this
this document will be published by IANA according to the procedures document as an additional uriScheme value for use with the "notify-
in RFC 2911 [RFC2911] section 6.1 with the following path: schemes-supported" Printer attribute defined in [ipp-ntfy]. This is
to be registered according to the procedures in RFC 2911 [RFC2911]
section 6.1.
ftp.isi.edu/iana/assignments/ipp/attribute-values/notify-schemes- uriScheme Attribute Values: Ref. Section:
supported/ indp RFC NNNN 6.1
The registry entry will contain the following information: The resulting URI scheme attribute value registration will be
published in the
ftp://ftp.iana.org/in-notes/iana/assignments/ipp/attribute-
Ref. Section: values/notify-schemes-supported/
indp RFC NNNN 6.2.1 area.
13.2.2 Additional values for the "operations-supported" Printer 13.2.2 Additional values for the "operations-supported" Printer
attribute attribute
The "operations-supported" type2 enum attribute value defined in this The following table lists the enum attribute value defined in this
document will be published by IANA according to the procedures in RFC document as an additional type2 enum value for use with the
2911 [RFC2911] section 6.1 with the following path: "operations-supported" Printer attribute defined in [RFC2911]. This
is to be registered according to the procedures in RFC 2911 [RFC2911]
ftp.isi.edu/iana/assignments/ipp/attribute-values/operations- section 6.1.
supported/
The registry entry will contain the following information: type2 enum Attribute Values: Value Ref. Section:
Send-Notifications 0x001D RFC NNNN 6.2
Value Ref. Section: The resulting enum attribute value registration will be published in
Send-Notifications 0x001D RFC NNNN 6.2.1 the
ftp://ftp.iana.org/in-notes/iana/assignments/ipp/attribute-
values/operations-supported/
area.
13.3 Status code Registrations 13.3 Status code Registrations
The status codes defined in this document will be published by IANA The following table lists all the status codes defined in this
according to the procedures in RFC 2911 [RFC2911] section 6.6 with document. These are to be registered according to the procedures in
the following path: RFC 2911 [RFC2911] section 6.6.
ftp.isi.edu/iana/assignments/ipp/status-codes/
The registry entry will contain the following information:
Status codes: Ref. Section: Status codes: Ref. Section:
successful-ok-ignored-notifications (0x0004) RFC NNNN 9.1.1 successful-ok-ignored-notifications (0x0004) RFC NNNN 9.1.1
client-error-ignored-all-notifications (0x0416) RFC NNNN 9.1.2 client-error-ignored-all-notifications (0x0416) RFC NNNN 9.1.2
Status Codes in Event Notification Attributes Groups:
client-error-not-found (0x0406) RFC NNNN 9.2.1
successful-ok-but-cancel-subscription (0x0006) RFC NNNN 9.2.2
The resulting status code registrations will be published in the
ftp://ftp.iana.org/in-notes/iana/assignments/ipp/status-codes/
area.
14 Internationalization Considerations 14 Internationalization Considerations
When the client requests Human Consumable form by supplying the When the client requests Human Consumable form by supplying the
"notify-text-format" operation attribute (see [ipp-ntfy]), the IPP "notify-text-format" operation attribute (see [ipp-ntfy]), the IPP
Printer (or any Notification Service that the IPP Printer might be Printer (or any Notification Service that the IPP Printer might be
configured to use) supplies and localizes the text value of the configured to use) supplies and localizes the text value of the
"human-readable-report" attribute in the Notification according to "human-readable-report" attribute in the Notification according to
the charset and natural language requested in the notification the charset and natural language requested in the notification
subscription. subscription.
skipping to change at page 25, line 39 skipping to change at page 28, line 10
recipients MAY support Basic Authentication (described in HTTP/1.1 recipients MAY support Basic Authentication (described in HTTP/1.1
[RFC2616]) for client authentication if the channel is secure. TLS [RFC2616]) for client authentication if the channel is secure. TLS
with the above mandated cipher suite can provide such a secure with the above mandated cipher suite can provide such a secure
channel. channel.
16 References 16 References
[ipp-iig] [ipp-iig]
Hastings, T., Manros, C., Kugler, K, Holst H., Zehler, P., Hastings, T., Manros, C., Kugler, K, Holst H., Zehler, P.,
"Internet Printing Protocol/1.1: draft-ietf-ipp-implementers- "Internet Printing Protocol/1.1: draft-ietf-ipp-implementers-
guide-v11-02.txt, work in progress, January 25, 2001 guide-v11-03.txt, work in progress, July 17, 2001
[ipp-ntfy] [ipp-ntfy]
Isaacson, S., Martin, J., deBry, R., Hastings, T., Shepherd, M., Isaacson, S., Martin, J., deBry, R., Hastings, T., Shepherd, M.,
Bergman, R., "Internet Printing Protocol/1.1: IPP Event Bergman, R., "Internet Printing Protocol/1.1: IPP Event
Notification Specification", <draft-ietf-ipp-not-spec-06.txt>, Notifications and Subscriptions", <draft-ietf-ipp-not-spec-07.txt>,
January 24, 2001. July 17, 2001.
[IANA-MIMEREG] [IANA-MIMEREG]
IANA MIME Media Types Registry. ftp://ftp.isi.edu/in- IANA MIME Media Types Registry. ftp://ftp.iana.org/in-
notes/iana/assignments/media-types/ notes/iana/assignments/media-types/
[IANA-PORTREG] [IANA-PORTREG]
IANA Port Numbers Registry. ftp://ftp.isi.edu/in- IANA Port Numbers Registry. ftp://ftp.iana.org/in-
notes/iana/assignments/port-numbers notes/iana/assignments/port-numbers
[RFC1900] [RFC1900]
B. Carpenter, Y. Rekhter. Renumbering Needs Work, RFC 1900, B. Carpenter, Y. Rekhter. Renumbering Needs Work, RFC 1900,
February 1996. February 1996.
[RFC2026] [RFC2026]
S. Bradner, "The Internet Standards Process -- Revision 3", RFC S. Bradner, "The Internet Standards Process -- Revision 3", RFC
2026, October 1996. 2026, October 1996.
skipping to change at page 27, line 48 skipping to change at page 30, line 22
Tom Hastings Tom Hastings
Xerox Corporation Xerox Corporation
737 Hawaii St. ESAE 231 737 Hawaii St. ESAE 231
El Segundo, CA 90245 El Segundo, CA 90245
Phone: 310-333-6413 Phone: 310-333-6413
Fax: 310-333-5514 Fax: 310-333-5514
e-mail: hastings@cp10.es.xerox.com e-mail: hastings@cp10.es.xerox.com
IPP Web Page: http://www.pwg.org/ipp/
IPP Mailing List: ipp@pwg.org
To subscribe to the ipp mailing list, send the following email:
1) send it to majordomo@pwg.org
2) leave the subject line blank
3) put the following two lines in the message body:
subscribe ipp
end
Implementers of this specification document are encouraged to join
the IPP Mailing List in order to participate in any discussions of
clarification issues and review of registration proposals for
additional attributes and values. In order to reduce spam the
mailing list rejects mail from non-subscribers, so you must subscribe
to the mailing list in order to send a question or comment to the
mailing list.
18 Summary of Base IPP documents 18 Summary of Base IPP documents
The base IPP documents includes: The base IPP documents includes:
Design Goals for an Internet Printing Protocol [RFC2567] Design Goals for an Internet Printing Protocol [RFC2567]
Rationale for the Structure and Model and Protocol for the Rationale for the Structure and Model and Protocol for the
Internet Printing Protocol [RFC2568] Internet Printing Protocol [RFC2568]
Internet Printing Protocol/1.1: Model and Semantics [RFC2911] Internet Printing Protocol/1.1: Model and Semantics [RFC2911]
Internet Printing Protocol/1.1: Encoding and Transport [RFC2910] Internet Printing Protocol/1.1: Encoding and Transport [RFC2910]
Internet Printing Protocol/1.1: Implementer's Guide [ipp-iig] Internet Printing Protocol/1.1: Implementer's Guide [ipp-iig]
Mapping between LPD and IPP Protocols [RFC2569] Mapping between LPD and IPP Protocols [RFC2569]
Internet Printing Protocol (IPP): IPP Event Notification Internet Printing Protocol (IPP): IPP Event Notifications and
Specification [ipp-ntfy] Subscriptions [ipp-ntfy]
The "Design Goals for an Internet Printing Protocol" document takes a The "Design Goals for an Internet Printing Protocol" document takes a
broad look at distributed printing functionality, and it enumerates broad look at distributed printing functionality, and it enumerates
real-life scenarios that help to clarify the features that need to be real-life scenarios that help to clarify the features that need to be
included in a printing protocol for the Internet. It identifies included in a printing protocol for the Internet. It identifies
requirements for three types of users: end users, operators, and requirements for three types of users: end users, operators, and
administrators. It calls out a subset of end user requirements that administrators. It calls out a subset of end user requirements that
are satisfied in IPP/1.0 [RFC2566, RFC2565]. A few OPTIONAL operator are satisfied in IPP/1.0 [RFC2566, RFC2565]. A few OPTIONAL operator
operations have been added to IPP/1.1 [RFC2911, RFC2910]. operations have been added to IPP/1.1 [RFC2911, RFC2910].
skipping to change at page 29, line 9 skipping to change at page 32, line 5
objects. It is intended to help them understand IPP/1.1 and some of objects. It is intended to help them understand IPP/1.1 and some of
the considerations that may assist them in the design of their client the considerations that may assist them in the design of their client
and/or IPP object implementations. For example, a typical order of and/or IPP object implementations. For example, a typical order of
processing requests is given, including error checking. Motivation processing requests is given, including error checking. Motivation
for some of the specification decisions is also included. for some of the specification decisions is also included.
The "Mapping between LPD and IPP Protocols" document gives some The "Mapping between LPD and IPP Protocols" document gives some
advice to implementers of gateways between IPP and LPD (Line Printer advice to implementers of gateways between IPP and LPD (Line Printer
Daemon) implementations. Daemon) implementations.
The "Internet Printing Protocol (IPP): IPP Event Notification The "Internet Printing Protocol (IPP): IPP Event Notifications and
Specification" document defines an extension to IPP/1.0 [RFC2566, Subscriptions" document defines an extension to IPP/1.0 [RFC2566,
RFC2565] and IPP/1.1 [RFC2911, RFC2910]. This extension allows a RFC2565] and IPP/1.1 [RFC2911, RFC2910]. This extension allows a
client to subscribe to printing related Events by creating a client to subscribe to printing related Events by creating a
Subscription Object and defines the semantics for delivering Subscription Object and defines the semantics for delivering
asynchronous Event Notifications to the specified Notification asynchronous Event Notifications to the specified Notification
Recipient via a specified Delivery Method (i.e., protocols) defined Recipient via a specified Delivery Method (i.e., protocols) defined
in (separate) Delivery Method documents. in (separate) Delivery Method documents.
19 Full Copyright Statement 19 Full Copyright Statement
Copyright (C) The Internet Society (2001). All Rights Reserved. Copyright (C) The Internet Society (2001). All Rights Reserved.
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