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draft-tgraf-netconf-yang-notifications-versioning-03.txt
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Network Working Group T. Graf
Internet-Draft Swisscom
Intended status: Standards Track B. Claise
Expires: 21 July 2023 Huawei
A. Huang Feng
INSA-Lyon
17 January 2023
Support of Versioning in YANG Notifications Subscription
draft-tgraf-netconf-yang-notifications-versioning-03
Abstract
This document extends the YANG notifications subscription mechanism
to specify the YANG module semantic version at the subscription.
Then, a new extension with the revision and the semantic version of
the YANG push subscription state change notification is proposed.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 21 July 2023.
Copyright Notice
Copyright (c) 2023 IETF Trust and the persons identified as the
document authors. All rights reserved.
Graf, et al. Expires 21 July 2023 [Page 1]
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This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document. Code Components
extracted from this document must include Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Extend the Datastore Selection . . . . . . . . . . . . . . . 3
3. Extend the Subscription State Change Notifications . . . . . 4
4. The "ietf-yang-push-revision" Module . . . . . . . . . . . . 5
4.1. Data Model Overview . . . . . . . . . . . . . . . . . . . 5
4.2. YANG Module . . . . . . . . . . . . . . . . . . . . . . . 10
5. Security Considerations . . . . . . . . . . . . . . . . . . . 13
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
8.1. Normative References . . . . . . . . . . . . . . . . . . 13
8.2. Informative References . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
In order to process the received YANG push notification messages
described in section 3.7 of [RFC8641] at the YANG push receiver, a
semantic reference to the YANG module and the XPath or subtree is
needed to determine the data types for each field and which part of
the YANG module the metrics are expose from.
This specification applies to the YANG push configured subscriptions
defined in Section 2.5 of [RFC8639], where a publisher is configured
to stream notification out of band, as opposed to dynamic
subscriptions defined in Section 2.4 of [RFC8639], where the
subscriber can initiate and modify the subscription dynamically in-
band. In the latter case, the subscriber knows already all the
subscriber YANG-related information, which it has to know in order to
configure the subscription.
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This semantic reference is available when the subscription is being
establish as described in Section 3.6 of [RFC8641] and being streamed
from the publisher to receiver with the subscription state change
notifications described in Section 2.7 of [RFC8639] where for each
subscription a locally unique subscription ID described in
Section 4.3.2 of [RFC8641] is being issued and streamed as metadata
with the notification message in the YANG push message header.
The semantics can change between different YANG module revisions.
The YANG module version statement is specified in Section 7.1.2 of
[RFC6020] and states that the newer revision needs to be backward
compatible to the previous revision. Section 3.1 of
[I-D.ietf-netmod-yang-module-versioning] specifies that newer
semantic versions introduced in [I-D.ietf-netmod-yang-semver] MAY not
be backward compatible to the previous version when indicated with
non-backwards-compatible keyword.
The YANG notifications subscription mechanism defined in [RFC8641]
does not allow to specify the YANG module revision. When a network
node is upgraded, the subscribed YANG module revision MAY have
updated and might, consequently, break the data processing pipeline
since the YANG push receiver may not be aware of this change.
This documents extends the current YANG notifications subscription
mechanism to allow to subscribe to a specific revision or latest YANG
module semantic version to which the YANG module version needs to be
backward compatible to. The subscription state change "subscription-
started" and "subscription-modified" notification messages are also
extended to include the revision and semantic version.
2. Extend the Datastore Selection
The YANG notifications subscription OPTIONALLY can be restricted to
the following YANG module revision for future capabilities:
latest: Restricts the subscription to the latest YANG module
revision.
revision: Restricts the subscription to a specific YANG module
revision. Example: "2014-05-08".
latest-compatible-semversion: Restricts the subscription to the
latest compatible YANG module semantic version referenced to.
Example: "2.0.0".
If nothing is specified, latest YANG module version is implied.
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3. Extend the Subscription State Change Notifications
Besides the Subscription ID and the xpath or sub-tree filter
reference as described in Section 2.7 of [RFC8639], the following
metadata objects are part of a "subscription-started" or
"subscription-modified" subscription state change notification.
revision: Describes the YANG module revision as specified in
Section 7.1.9 of [RFC6020] for the related streamed content.
revision-label: Describes the YANG module semantic version as
specified in [I-D.ietf-netmod-yang-semver] for the related
streamed content.
Figure 1 provides an example of a "subscription-modified"
subscription state change notification message with the YANG
revision, revision label and datastore-xpath-filter for tracking the
operational status of a single Ethernet interface (per [RFC8343]).
This subscription state change notification message is encoded XML
[W3C.REC-xml-20081126] over the Network Configuration Protocol
(NETCONF) as per [RFC8640].
<notification xmlns="urn:ietf:params:xml:ns:netconf:notification:1.0">
<eventTime>2023-01-03T10:00:00Z</eventTime>
<subscription-modified
xmlns="urn:ietf:params:xml:ns:yang:ietf-subscribed-notifications">
<id>101</id>
<revision>2014-05-08</revision>
<revision-label>1.0.0</revision-label>
<stream-xpath-filter xmlns:int="urn:ietf:params:xml:ns:yang:ietf-interfaces">
/int:interfaces
</stream-xpath-filter>
<stream>NETCONF</stream>
</subscription-modified>
</notification>
Figure 1: XML Push Example for a subscription-modified
notification message
Figure 2 provides an example of a JSON encoded, [RFC8259],
subscription state change notification message over HTTPS-based
[I-D.ietf-netconf-https-notif] or UDP-based
[I-D.ietf-netconf-udp-notif] transport for the same subscription.
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{
"ietf-restconf:notification" : {
"eventTime": "2023-01-03T10:00:00Z",
"ietf-subscribed-notifications:subscription-modified": {
"id": 101,
"revision": "2014-05-08",
"revision-label": "1.0.0",
"stream-xpath-filter": "/ietf-interfaces:interfaces",
"stream": {
"ietf-netconf-subscribed-notifications" : "NETCONF"
}
}
}
}
Figure 2: JSON Push Example for a subscription-modified
notification message
4. The "ietf-yang-push-revision" Module
4.1. Data Model Overview
This YANG module augments the "ietf-yang-push" module with the
revision and revision-label in the "subscription-started" and
"subscription-modified" subscription state change notifications and
the ability to define the "revision" and "revision-label" in the
"establish-subscription" and "modify-subscription" RPCs in the
datastore push subscription.
4.1.1. Tree View
The following is the YANG tree diagram [RFC8340] for the ietf-yang-
push-revision YANG module
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module: ietf-yang-push-revision
augment /sn:establish-subscription/sn:input/sn:target:
+--rw revision? rev:revision-date-or-label
+-- revision-label? ysver:version
augment /sn:modify-subscription/sn:input/sn:target:
+--rw revision? rev:revision-date-or-label
+-- revision-label? ysver:version
augment /sn:subscription-started/sn:target:
+--ro revision rev:revision-date-or-label
+-- revision-label? ysver:version
augment /sn:subscription-modified/sn:target:
+--ro revision rev:revision-date-or-label
+-- revision-label? ysver:version
augment /sn:subscriptions/sn:subscription/sn:target:
+--ro revision rev:revision-date-or-label
+--rw revision-label? ysver:version
4.1.2. Full Tree View
The following is the YANG tree diagram [RFC8340] for the ietf-yang-
push-revision augmentation within the ietf-subscribed-notifications,
including the RPCs and notifications.
pyang -f tree ietf-yang-push-revision.yang ietf-yang-revisions.yang ietf-subscribed-notifications@2019-09-09.yang
ietf-yang-push-revision.yang:118 (at ietf-yang-push-revision.yang:88): error: cannot augment with mandatory node "revision"
module: ietf-subscribed-notifications
+--ro streams
| +--ro stream* [name]
| +--ro name string
| +--ro description? string
| +--ro replay-support? empty {replay}?
| +--ro replay-log-creation-time yang:date-and-time {replay}?
| +--ro replay-log-aged-time? yang:date-and-time {replay}?
+--rw filters
| +--rw stream-filter* [name]
| +--rw name string
| +--rw (filter-spec)?
| +--:(stream-subtree-filter)
| | +--rw stream-subtree-filter? <anydata> {subtree}?
| +--:(stream-xpath-filter)
| +--rw stream-xpath-filter? yang:xpath1.0 {xpath}?
+--rw subscriptions
+--rw subscription* [id]
+--rw id subscription-id
+--rw (target)
| +--:(stream)
| | +--rw (stream-filter)?
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| | | +--:(by-reference)
| | | | +--rw stream-filter-name stream-filter-ref
| | | +--:(within-subscription)
| | | +--rw (filter-spec)?
| | | +--:(stream-subtree-filter)
| | | | +--rw stream-subtree-filter? <anydata> {subtree}?
| | | +--:(stream-xpath-filter)
| | | +--rw stream-xpath-filter? yang:xpath1.0 {xpath}?
| | +--rw stream stream-ref
| | +--ro replay-start-time? yang:date-and-time {replay}?
| | +--rw configured-replay? empty {configured,replay}?
| +--:(ypm:revision)
| | +--ro ypm:revision rev:revision-date-or-label
| +--:(ypm:revision-label)
| +--rw ypm:revision-label? ysver:version
+--rw stop-time? yang:date-and-time
+--rw dscp? inet:dscp {dscp}?
+--rw weighting? uint8 {qos}?
+--rw dependency? subscription-id {qos}?
+--rw transport? transport {configured}?
+--rw encoding? encoding
+--rw purpose? string {configured}?
+--rw (notification-message-origin)? {configured}?
| +--:(interface-originated)
| | +--rw source-interface? if:interface-ref {interface-designation}?
| +--:(address-originated)
| +--rw source-vrf? -> /ni:network-instances/network-instance/name {supports-vrf}?
| +--rw source-address? inet:ip-address-no-zone
+--ro configured-subscription-state? enumeration {configured}?
+--rw receivers
+--rw receiver* [name]
+--rw name string
+--ro sent-event-records? yang:zero-based-counter64
+--ro excluded-event-records? yang:zero-based-counter64
+--ro state enumeration
+---x reset {configured}?
+--ro output
+--ro time yang:date-and-time
rpcs:
+---x establish-subscription
| +---w input
| | +---w (target)
| | | +--:(stream)
| | | | +---w (stream-filter)?
| | | | | +--:(by-reference)
| | | | | | +---w stream-filter-name stream-filter-ref
| | | | | +--:(within-subscription)
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| | | | | +---w (filter-spec)?
| | | | | +--:(stream-subtree-filter)
| | | | | | +---w stream-subtree-filter? <anydata> {subtree}?
| | | | | +--:(stream-xpath-filter)
| | | | | +---w stream-xpath-filter? yang:xpath1.0 {xpath}?
| | | | +---w stream stream-ref
| | | | +---w replay-start-time? yang:date-and-time {replay}?
| | | +--:(ypm:revision)
| | | | +---w ypm:revision? rev:revision-date-or-label
| | | +--:(ypm:revision-label)
| | | +---w ypm:revision-label? ysver:version
| | +---w stop-time? yang:date-and-time
| | +---w dscp? inet:dscp {dscp}?
| | +---w weighting? uint8 {qos}?
| | +---w dependency? subscription-id {qos}?
| | +---w encoding? encoding
| +--ro output
| +--ro id subscription-id
| +--ro replay-start-time-revision? yang:date-and-time {replay}?
+---x modify-subscription
| +---w input
| +---w id subscription-id
| +---w (target)
| | +--:(stream)
| | | +---w (stream-filter)?
| | | +--:(by-reference)
| | | | +---w stream-filter-name stream-filter-ref
| | | +--:(within-subscription)
| | | +---w (filter-spec)?
| | | +--:(stream-subtree-filter)
| | | | +---w stream-subtree-filter? <anydata> {subtree}?
| | | +--:(stream-xpath-filter)
| | | +---w stream-xpath-filter? yang:xpath1.0 {xpath}?
| | +--:(ypm:revision)
| | | +---w ypm:revision? rev:revision-date-or-label
| | +--:(ypm:revision-label)
| | +---w ypm:revision-label? ysver:version
| +---w stop-time? yang:date-and-time
+---x delete-subscription
| +---w input
| +---w id subscription-id
+---x kill-subscription
+---w input
+---w id subscription-id
notifications:
+---n replay-completed {replay}?
| +--ro id subscription-id
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+---n subscription-completed {configured}?
| +--ro id subscription-id
+---n subscription-modified
| +--ro id subscription-id
| +--ro (target)
| | +--:(stream)
| | | +--ro (stream-filter)?
| | | | +--:(by-reference)
| | | | | +--ro stream-filter-name stream-filter-ref
| | | | +--:(within-subscription)
| | | | +--ro (filter-spec)?
| | | | +--:(stream-subtree-filter)
| | | | | +--ro stream-subtree-filter? <anydata> {subtree}?
| | | | +--:(stream-xpath-filter)
| | | | +--ro stream-xpath-filter? yang:xpath1.0 {xpath}?
| | | +--ro stream stream-ref
| | | +--ro replay-start-time? yang:date-and-time {replay}?
| | +--:(ypm:revision)
| | | +--ro ypm:revision rev:revision-date-or-label
| | +--:(ypm:revision-label)
| | +--ro ypm:revision-label? ysver:version
| +--ro stop-time? yang:date-and-time
| +--ro dscp? inet:dscp {dscp}?
| +--ro weighting? uint8 {qos}?
| +--ro dependency? subscription-id {qos}?
| +--ro transport? transport {configured}?
| +--ro encoding? encoding
| +--ro purpose? string {configured}?
+---n subscription-resumed
| +--ro id subscription-id
+---n subscription-started {configured}?
| +--ro id subscription-id
| +--ro (target)
| | +--:(stream)
| | | +--ro (stream-filter)?
| | | | +--:(by-reference)
| | | | | +--ro stream-filter-name stream-filter-ref
| | | | +--:(within-subscription)
| | | | +--ro (filter-spec)?
| | | | +--:(stream-subtree-filter)
| | | | | +--ro stream-subtree-filter? <anydata> {subtree}?
| | | | +--:(stream-xpath-filter)
| | | | +--ro stream-xpath-filter? yang:xpath1.0 {xpath}?
| | | +--ro stream stream-ref
| | | +--ro replay-start-time? yang:date-and-time {replay}?
| | | +--ro replay-previous-event-time? yang:date-and-time {replay}?
| | +--:(ypm:revision)
| | | +--ro ypm:revision rev:revision-date-or-label
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| | +--:(ypm:revision-label)
| | +--ro ypm:revision-label? ysver:version
| +--ro stop-time? yang:date-and-time
| +--ro dscp? inet:dscp {dscp}?
| +--ro weighting? uint8 {qos}?
| +--ro dependency? subscription-id {qos}?
| +--ro transport? transport {configured}?
| +--ro encoding? encoding
| +--ro purpose? string {configured}?
+---n subscription-suspended
| +--ro id subscription-id
| +--ro reason identityref
+---n subscription-terminated
+--ro id subscription-id
+--ro reason identityref
4.2. YANG Module
The YANG module has two leaves augmenting the model of Subscription
to YANG Notifications [RFC8639].
<CODE BEGINS> file "ietf-yang-push-revision@2023-01-12.yang"
module ietf-yang-push-revision {
yang-version 1.1;
namespace
"urn:ietf:params:xml:ns:yang:ietf-yang-push-revision";
prefix ypm;
import ietf-subscribed-notifications {
prefix sn;
reference
"RFC 8639: Subscription to YANG Notifications";
}
import ietf-yang-revisions {
prefix rev;
reference
"RFC XXXX: draft-ietf-netmod-yang-module-versioning-06, Updated YANG
Module Revision Handling";
}
import ietf-yang-semver {
prefix ysver;
reference
"RFC XXXX: draft-ietf-netmod-yang-semver-08, YANG Semantic Versioning";
}
organization "IETF NETCONF (Network Configuration) Working Group";
contact
"WG Web: <http:/tools.ietf.org/wg/netconf/>
WG List: <mailto:netconf@ietf.org>
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Authors: Thomas Graf
<mailto:thomas.graf@swisscom.com>
Benoit Claise
<mailto:benoit.claise@huawei.com>
Alex Huang Feng
<mailto:alex.huang-feng@insa-lyon.fr>";
description
"Defines YANG push event notification header with the revision and
the revision-label. Adds the support of the revision and
revision-label selection in the YANG push subscription RPCs.
Copyright (c) 2023 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, is permitted pursuant to, and subject to the license
terms contained in, the Revised BSD License set forth in Section
4.c of the IETF Trust's Legal Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX; see the RFC
itself for full legal notices.";
revision 2023-01-12 {
description
"First revision";
reference
"RFC XXXX: Support of Versioning in YANG Notifications Subscription";
}
feature yang-push-revision-supported {
description
"This feature indicates the YANG Subscription Notifications supports
the revision and revision-label defined in this YANG module.";
}
grouping yang-push-module-version-config {
description
"This grouping combines the revision and revision-label leaves, with
the revison being configurable.";
leaf revision {
type rev:revision-date-or-label;
description
"This references the YANG module revision to be sent in the subscription.";
}
leaf revision-label {
type ysver:version;
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description
"This references the YANG module semversion to be sent in the subscription.";
}
}
grouping yang-push-module-version {
description
"This grouping combines the revision and revision-label leaves, with
the revison being non configurable.";
leaf revision {
type rev:revision-date-or-label;
config false;
mandatory true;
description
"This references the YANG module revision of the sent notification message.";
}
leaf revision-label {
type ysver:version;
description
"This references the YANG module semversion of the sent notification message.";
}
}
// Subscription parameters
augment "/sn:establish-subscription/sn:input/sn:target" {
description
"Augment the establish-subscription RPC from the ietf-subscribed-notifications
YANG module with the yang-push-module-version-config grouping.";
uses ypm:yang-push-module-version-config;
}
augment "/sn:modify-subscription/sn:input/sn:target" {
description
"Augment the modify-subscription RPC from the ietf-subscribed-notifications
YANG module with the yang-push-module-version-config grouping.";
uses ypm:yang-push-module-version-config;
}
// Subscription notifications
augment "/sn:subscription-started/sn:target" {
description
"Augment the subscription-started RPC from the ietf-subscribed-notifications
YANG module with the yang-push-module-version grouping.";
uses ypm:yang-push-module-version;
}
augment "/sn:subscription-modified/sn:target" {
description
"Augment the subscription-modified RPC from the ietf-subscribed-notifications
YANG module with the yang-push-module-version grouping.";
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uses ypm:yang-push-module-version;
}
// Subscription container
augment "/sn:subscriptions/sn:subscription/sn:target" {
description
"Augment the subscriptions RPC from the ietf-subscribed-notifications
YANG module with the yang-push-module-version grouping.";
uses ypm:yang-push-module-version;
}
}
<CODE ENDS>
5. Security Considerations
The security considerations for the YANG notifications subscription
mechanism are described in [RFC8641]. This documents adds no
additional security considerations.
6. IANA Considerations
This document has no IANA actions.
7. Acknowledgements
The authors would like to thank xxx for their review and valuable
comments.
8. References
8.1. Normative References
[I-D.ietf-netmod-yang-module-versioning]
Wilton, R., Rahman, R., Lengyel, B., Clarke, J., and J.
Sterne, "Updated YANG Module Revision Handling", Work in
Progress, Internet-Draft, draft-ietf-netmod-yang-module-
versioning-08, 12 January 2023,
<https://www.ietf.org/archive/id/draft-ietf-netmod-yang-
module-versioning-08.txt>.
[I-D.ietf-netmod-yang-semver]
Clarke, J., Wilton, R., Rahman, R., Lengyel, B., Sterne,
J., and B. Claise, "YANG Semantic Versioning", Work in
Progress, Internet-Draft, draft-ietf-netmod-yang-semver-
09, 12 January 2023, <https://www.ietf.org/archive/id/
draft-ietf-netmod-yang-semver-09.txt>.
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[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
DOI 10.17487/RFC6020, October 2010,
<https://www.rfc-editor.org/info/rfc6020>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8639] Voit, E., Clemm, A., Gonzalez Prieto, A., Nilsen-Nygaard,
E., and A. Tripathy, "Subscription to YANG Notifications",
RFC 8639, DOI 10.17487/RFC8639, September 2019,
<https://www.rfc-editor.org/info/rfc8639>.
[RFC8641] Clemm, A. and E. Voit, "Subscription to YANG Notifications
for Datastore Updates", RFC 8641, DOI 10.17487/RFC8641,
September 2019, <https://www.rfc-editor.org/info/rfc8641>.
8.2. Informative References
[I-D.ietf-netconf-https-notif]
Jethanandani, M. and K. Watsen, "An HTTPS-based Transport
for YANG Notifications", Work in Progress, Internet-Draft,
draft-ietf-netconf-https-notif-13, 4 November 2022,
<https://www.ietf.org/archive/id/draft-ietf-netconf-https-
notif-13.txt>.
[I-D.ietf-netconf-udp-notif]
Zheng, G., Zhou, T., Graf, T., Francois, P., Feng, A. H.,
and P. Lucente, "UDP-based Transport for Configured
Subscriptions", Work in Progress, Internet-Draft, draft-
ietf-netconf-udp-notif-08, 12 September 2022,
<https://www.ietf.org/archive/id/draft-ietf-netconf-udp-
notif-08.txt>.
[RFC8259] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
Interchange Format", STD 90, RFC 8259,
DOI 10.17487/RFC8259, December 2017,
<https://www.rfc-editor.org/info/rfc8259>.
[RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.
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[RFC8343] Bjorklund, M., "A YANG Data Model for Interface
Management", RFC 8343, DOI 10.17487/RFC8343, March 2018,
<https://www.rfc-editor.org/info/rfc8343>.
[RFC8640] Voit, E., Clemm, A., Gonzalez Prieto, A., Nilsen-Nygaard,
E., and A. Tripathy, "Dynamic Subscription to YANG Events
and Datastores over NETCONF", RFC 8640,
DOI 10.17487/RFC8640, September 2019,
<https://www.rfc-editor.org/info/rfc8640>.
[W3C.REC-xml-20081126]
Bray, T., Paoli, J., Sperberg-McQueen, M., Maler, E., and
F. Yergeau, "Extensible Markup Language (XML) 1.0 (Fifth
Edition)", World Wide Web Consortium Recommendation REC-
xml-20081126, November 2008,
<https://www.w3.org/TR/2008/REC-xml-20081126>.
Authors' Addresses
Thomas Graf
Swisscom
Binzring 17
CH-8045 Zurich
Switzerland
Email: thomas.graf@swisscom.com
Benoit Claise
Huawei
Email: benoit.claise@huawei.com
Alex Huang Feng
INSA-Lyon
Lyon
France
Email: alex.huang-feng@insa-lyon.fr
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