< draft-snell-atompub-tombstones-17.txt		draft-snell-atompub-tombstones-18.txt >
	Network Working Group J. Snell		Network Working Group J. Snell
	Internet-Draft July 16, 2012		Internet-Draft July 20, 2012
	Intended status: Standards Track		Intended status: Standards Track
	Expires: January 17, 2013		Expires: January 21, 2013
	The Atom "deleted-entry" Element		The Atom "deleted-entry" Element
	draft-snell-atompub-tombstones-17		draft-snell-atompub-tombstones-18
	Abstract		Abstract
	This specification adds mechanisms to the Atom Syndication Format		This specification adds mechanisms to the Atom Syndication Format
	which publishers of Atom Feed and Entry documents can use to		which publishers of Atom Feed and Entry documents can use to
	explicitly identify Atom entries that have been removed.		explicitly identify Atom entries that have been removed.
	Status of this Memo		Status of this Memo
	This Internet-Draft is submitted to IETF in full conformance with the		This Internet-Draft is submitted to IETF in full conformance with the
	skipping to change at page 1, line 32 ¶		skipping to change at page 1, line 32 ¶
	Internet-Drafts are working documents of the Internet Engineering		Internet-Drafts are working documents of the Internet Engineering
	Task Force (IETF). Note that other groups may also distribute		Task Force (IETF). Note that other groups may also distribute
	working documents as Internet-Drafts. The list of current Internet-		working documents as Internet-Drafts. The list of current Internet-
	Drafts is at http://datatracker.ietf.org/drafts/current/.		Drafts is at http://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	This Internet-Draft will expire on January 17, 2013.		This Internet-Draft will expire on January 21, 2013.
	Copyright Notice		Copyright Notice
	Copyright (c) 2012 IETF Trust and the persons identified as the		Copyright (c) 2012 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents		Provisions Relating to IETF Documents
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	skipping to change at page 2, line 11 ¶		skipping to change at page 2, line 11 ¶
	include Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	described in the Simplified BSD License.		described in the Simplified BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
	2. Notational Conventions . . . . . . . . . . . . . . . . . . . . 3		2. Notational Conventions . . . . . . . . . . . . . . . . . . . . 3
	3. The at:deleted-entry element . . . . . . . . . . . . . . . . . 3		3. The at:deleted-entry element . . . . . . . . . . . . . . . . . 3
	4. Deleted Entry Document . . . . . . . . . . . . . . . . . . . . 6		4. Deleted Entry Document . . . . . . . . . . . . . . . . . . . . 6
	5. Digital Signatures . . . . . . . . . . . . . . . . . . . . . . 6		5. Digital Signatures . . . . . . . . . . . . . . . . . . . . . . 7
	6. Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . 7		6. Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . 7
	7. Security Considerations . . . . . . . . . . . . . . . . . . . 8		7. Security Considerations . . . . . . . . . . . . . . . . . . . 8
	8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8		8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
	9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9		9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
	10. Normative References . . . . . . . . . . . . . . . . . . . . . 9		10. Normative References . . . . . . . . . . . . . . . . . . . . . 10
	Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 10		Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 11
	1. Introduction		1. Introduction
	This specification adds mechanisms to the Atom Syndication Format		Atom [RFC4287] is an XML-based document format that describes lists
	which publishers of Atom Feed and Entry documents can use to		of related information known as "feeds". Feeds are composed of a
	explicitly identify Atom entries that have been removed.		number of items, known as "entries", each with an extensible set of
			attached metadata. The primary use case that Atom addresses is the
			syndication of Web content such as weblogs and news headlines to Web
			sites as well as directly to user agents.
			In the base Atom format, when an entry is removed from a feed, but a
			consumer has already received and processed that entry, perhaps
			adding it to a local cache or display, there is no mechanism for
			determining that the entry has been removed. This specification adds
			a mechanism to the Atom Syndication Format that publishers of Atom
			Feed and Entry documents can use to explicitly identify Atom entries
			that have been removed. Atom consumers can use that information to
			adjust such things as their document cache and user interfaces.
	2. Notational Conventions		2. Notational Conventions
	The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
	"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this		"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
	document are to be interpreted as described in [RFC2119].		document are to be interpreted as described in [RFC2119].
	This specification uses XML Namespaces [W3C.REC-xml-names-19990114]		This specification uses XML Namespaces [W3C.REC-xml-names-19990114]
	to uniquely identify XML element names. It uses the following		to uniquely identify XML element names. It uses the following
	namespace prefix for the indicated namespace URI;		namespace prefix for the indicated namespace URI;
	skipping to change at page 10, line 6 ¶		skipping to change at page 10, line 33 ¶
	Resource Identifier (URI): Generic Syntax", STD 66,		Resource Identifier (URI): Generic Syntax", STD 66,
	RFC 3986, January 2005.		RFC 3986, January 2005.
	[RFC3987] Duerst, M. and M. Suignard, "Internationalized Resource		[RFC3987] Duerst, M. and M. Suignard, "Internationalized Resource
	Identifiers (IRIs)", RFC 3987, January 2005.		Identifiers (IRIs)", RFC 3987, January 2005.
	[RFC4287] Nottingham, M., Ed. and R. Sayre, Ed., "The Atom		[RFC4287] Nottingham, M., Ed. and R. Sayre, Ed., "The Atom
	Syndication Format", RFC 4287, December 2005.		Syndication Format", RFC 4287, December 2005.
	[W3C.REC-xml-20040204]		[W3C.REC-xml-20040204]
	Yergeau, F., Maler, E., Bray, T., Sperberg-McQueen, C.,		Yergeau, F., Maler, E., Sperberg-McQueen, C., Paoli, J.,
	and J. Paoli, "Extensible Markup Language (XML) 1.0 (Third		and T. Bray, "Extensible Markup Language (XML) 1.0 (Third
	Edition)", World Wide Web Consortium FirstEdition REC-xml-		Edition)", World Wide Web Consortium FirstEdition REC-xml-
	20040204, February 2004,		20040204, February 2004,
	<http://www.w3.org/TR/2004/REC-xml-20040204>.		<http://www.w3.org/TR/2004/REC-xml-20040204>.
	[W3C.REC-xml-c14n-20010315]		[W3C.REC-xml-c14n-20010315]
	Boyer, J., "Canonical XML Version 1.0", World Wide Web		Boyer, J., "Canonical XML Version 1.0", World Wide Web
	Consortium Recommendation REC-xml-c14n-20010315,		Consortium Recommendation REC-xml-c14n-20010315,
	March 2001,		March 2001,
	<http://www.w3.org/TR/2001/REC-xml-c14n-20010315>.		<http://www.w3.org/TR/2001/REC-xml-c14n-20010315>.
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