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2 Network Working Group J. Snell
3 Internet-Draft August 2005
4 Expires: February 2, 2006
6 Feed Thread: Enabling Threaded Entries in Atom
7 draft-snell-atompub-feed-thread-02.txt
9 Status of this Memo
11 By submitting this Internet-Draft, each author represents that any
12 applicable patent or other IPR claims of which he or she is aware
13 have been or will be disclosed, and any of which he or she becomes
14 aware will be disclosed, in accordance with Section 6 of BCP 79.
16 Internet-Drafts are working documents of the Internet Engineering
17 Task Force (IETF), its areas, and its working groups. Note that
18 other groups may also distribute working documents as Internet-
19 Drafts.
21 Internet-Drafts are draft documents valid for a maximum of six months
22 and may be updated, replaced, or obsoleted by other documents at any
23 time. It is inappropriate to use Internet-Drafts as reference
24 material or to cite them other than as "work in progress."
26 The list of current Internet-Drafts can be accessed at
27 http://www.ietf.org/ietf/1id-abstracts.txt.
29 The list of Internet-Draft Shadow Directories can be accessed at
30 http://www.ietf.org/shadow.html.
32 This Internet-Draft will expire on February 2, 2006.
34 Copyright Notice
36 Copyright (C) The Internet Society (2005).
38 Abstract
40 This memo presents a mechanism that allows feeds publishers to
41 express threaded discussions within the Atom Syndication Format.
43 Table of Contents
45 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
46 2. Notational Conventions . . . . . . . . . . . . . . . . . . . 3
47 3. The 'in-reply-to' extension element . . . . . . . . . . . . 3
48 4. The 'replies' link relation . . . . . . . . . . . . . . . . 6
49 5. Security Considerations . . . . . . . . . . . . . . . . . . 7
50 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . 8
51 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
52 Author's Address . . . . . . . . . . . . . . . . . . . . . . 8
53 A. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
54 Intellectual Property and Copyright Statements . . . . . . . 10
56 1. Introduction
58 This document specifies a mechanism that allows the expression of
59 threaded discussions within the Atom Syndication Format ([I-D.ietf-
60 atompub-format]).
62 2. Notational Conventions
64 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
65 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
66 document are to be interpreted as described in BCP 14, [RFC2119], as
67 scoped to those conformance targets.
69 In this specification, "entry" refers to an atom:entry element.
71 In this specification, "feed" refers to an Atom Feed Document.
73 In this specification, "head section" refers to the children of a
74 feed's document-wide metadata container; e.g., the child elements of
75 the atom:feed element in an Atom Feed Document.
77 In this specification, "link" refers to the atom:link element.
79 In this specification, "link relation" refers to the value of the
80 atom:link element's rel attribute.
82 In this specification, the term "extension element" refers to a
83 structured extension element as described in [I-D.ietf-atompub-
84 format].
86 This specification uses XML Namespaces [W3C.REC-xml-names-19990114]
87 to uniquely identify XML element names. It uses the following
88 namespace prefix for the indicated namespace URI;
89 "thr": "http://purl.org/syndication/thread/1.0"
91 This specification uses terms from the XML Infoset [W3C.REC-xml-
92 infoset-20040204]. However, this specification uses a shorthand; the
93 phrase "Information Item" is omitted when naming Element Information
94 Items. Therefore, when this specification uses the term "element,"
95 it is referring to an Element Information Item in Infoset terms.
97 3. The 'in-reply-to' extension element
99 The 'in-reply-to' extension element is used to indicate that a feed
100 entry is a response to another resource. The element must take one
101 of two forms as described by the inReplyToDereferenceable and
102 inReplyToNonDereferenceable constructs defined below.
104 inReplyToCommonAttributes = {
105 attribute reflang { atomLanguageTag }?,
106 attribute title { text }?
107 }
109 inReplyToDereferenceable = element thr:in-reply-to {
110 atomCommonAttributes,
111 inReplyToCommonAttributes,
112 attribute href { atomURI },
113 attribute type { atomMediatype }?
114 }
116 inReplyToNonDereferenceable = element thr:in-reply-to {
117 atomCommonAttributes,
118 inReplyToCommonAttributes,
119 attribute idref { atomURI },
120 attribute type { atomMediaType }?,
121 attribute source { atomURI}?
122 }
124 In the inReplyToDereferenceable form, the href attribute MUST specify
125 a dereferenceable URI that may be used to locate the entity that the
126 containing Atom Entry is a response to. The type attribute MAY be
127 used to indicate the media type of the entity specified by the href
128 attribute.
130 In the inReplyToNonDereferenceable form, the idref attribute MUST
131 specify a nondereferenceable URI that uniquely identifies the entity
132 that the containing Atom Entry is a response to; for instance, if the
133 resource being responded to is an atom:entry, the idref should
134 specify the value of the entry's atom:id element. The type attribute
135 MAY be used to indicate the media type of the entity identified by
136 the id attribute. The source attribute MAY be used to specify a
137 dereferenceable URI identifying the source of the entity being
138 responded to.
140 In either form, the title attribute MAY be used to specify a human
141 readable title for the resource referenced by the href attribute.
142 The reflang attribute MAY be used to specify the language of the
143 resource referenced by the href attribute. The value of the reflang
144 MUST be a language tag [RFC3066].
146 o atom:entry elements MAY contain any number of 'in-reply-to'
147 extension elements.
148 o atom:entry elements MUST NOT contain more than one 'in-reply-to'
149 extension element having the same 'type' and 'href' attribute or
150 'type' and 'idref' attribute values.
152 o atom:feed elements MAY contain any number of 'in-reply-to'
153 extension elements.
154 o atom:feed elements MUST NOT contain more than one 'in-reply-to'
155 extension elements having the same 'type' and 'href' attribute or
156 'type' and 'idref' attribute values.
157 o atom:source elements MAY contain any number of 'in-reply-to'
158 extension elements.
159 o atom:source elements MUST NOT contain more than one 'in-reply-to'
160 extension element having the same 'type' and 'href' attribute or
161 'type' and 'idref' attribute values.
163 An 'in-reply-to' extension element appearing as a child of an atom:
164 feed element indicates that all of the atom:entry elements contained
165 within that atom:feed are responses to the referenced resource.
167 For example
168
169 http://www.example.com/myfeed
170 My Example Feed
171 2005-07-28T12:00:00Z
172
173 James
174
175 tag:example.com,2005:1
176 My original entry
177
178 This is my original entry
179
180
181 tag:example.com,2005:1,1
182 A response to the original
183
184
188 This is a response to the original entry
189
190
192 The behavior of 'in-reply-to' extension elements with type attributes
193 specifying any media type other than "application/atom+xml" is
194 undefined. Software written to conform to this version of the
195 specification will not be guaranteed to process such links correctly.
197 When an 'in-reply-to' extension element is used to reference an
198 entity that does not appear within the same Atom document as the
199 entry containing the in-reply-to element, a "related" link relation
200 SHOULD be included that references the same URI as the href attribute
201 in dereferenceable in-reply-to elements or the source attribute in
202 non-dereferenceable in-reply-to elements.
204 For example
205
206 http://www.example.com/myfeed
207 My Example Feed
208 2005-07-28T12:00:00Z
209
210 James
211
212 tag:example.com,2005:1,1
213 A response to the original
214
215
218
220 This is a response to the original entry
221
222
224 4. The 'replies' link relation
226 While responses to entries MAY appear within the same feed as the
227 entry being responded to, it is common practice to separate responses
228 into a separate feed document or other resource. In such cases, it
229 is helpful for an atom:feed or atom:entry to indicate the location of
230 a resource where responses may be found. For this purpose, the
231 'replies' link relation is used.
233 The type attribute of the 'replies' link relation indicates the type
234 of resource containing the responses. A value of 'application/
235 atom+xml' indicates that the resource identified by the link's href
236 attribute is either an Atom Feed Document or an Atom Entry Document
237 that MAY contain one or more 'in-reply-to' link relations. If the
238 type attribute is omitted, it's value is assumed to be "application/
239 atom+xml".
241 o atom:entry elements MAY contain any number of 'replies' link
242 relations.
243 o atom:entry elements MUST NOT contain more than one 'replies' link
244 relation having the same 'type' and 'href' attribute values.
245 o atom:feed elements MAY contain any number of 'replies' link
246 relations.
248 o atom:feed elements MUST NOT contain more than one 'replies' link
249 relation having the same 'type' and 'href' attribute values.
250 o atom:source elements MAY contain any number of 'replies' link
251 relations.
252 o atom:source elements MUST NOT contain more than one 'replies' link
253 relation having the same 'type' and 'href' attribute values.
255 A 'replies' link relation appearing as a child of an atom:feed
256 element indicates that the referenced resource MAY contain responses
257 to any of the atom:feed elements contained atom:entry's. A 'replies'
258 link relation appearing as a cihld of an atom:entry or atom:source
259 element indicates that the referenced resource MAY contain responses
260 to the containing atom:entry.
262 The presence of a 'replies' link relation is merely a hint as to
263 where responses to entries MAY be found and does not guarantee that
264 the referenced resource contains any 'in-reply-to' link relations or
265 responses to any entries within the containing feed.
267 For example, replies contained in a separate Atom feed
268
269 http://www.example.com/myfeed
270 My Example Feed
271 2005-07-28T12:00:00Z
272
273
276 James
277
278 tag:entries.com,2005:1
279 My original entry
280
281 This is my original entry
282
283
285 The behavior of 'replies' link relations specifying any media type
286 other than "application/atom+xml" is undefined. Software written to
287 conform to this version of the specification will not be guaranteed
288 to process such links correctly.
290 5. Security Considerations
292 Feeds using the mechanisms described here could be crafted in such a
293 way as to cause a consumer to initiate excessive (or even an unending
294 sequence of) network requests, causing denial of service (either to
295 the consumer, the target server, and/or intervening networks). This
296 risk can be mitigated by requiring user intervention after a certain
297 number of requests, or by limiting requests either according to a
298 hard limit, or with heuristics.
300 6. IANA Considerations
302 This specification defines one new Atom link relation type to be
303 registered in the IANA Registry of Link Relation as defined by
304 [I-D.ietf-atompub-format].
305 Attribute Value: replies
306 Description: (see section 4)
307 Expected display characteristics: (see section 4)
308 Security considerations: (see section 6)
310 7. References
312 [I-D.ietf-atompub-format]
313 Sayre, R. and M. Nottingham, "The Atom Syndication
314 Format", draft-ietf-atompub-format-11 (work in progress),
315 August 2005.
317 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
318 Requirement Levels", BCP 14, RFC 2119, March 1997.
320 [RFC3066] Alvestrand, H., "Tags for the Identification of
321 Languages", BCP 47, RFC 3066, January 2001.
323 [W3C.REC-xml-infoset-20040204]
324 Tobin, R. and J. Cowan, "XML Information Set (Second
325 Edition)", W3C REC REC-xml-infoset-20040204,
326 February 2004.
328 [W3C.REC-xml-names-19990114]
329 Hollander, D., Bray, T., and A. Layman, "Namespaces in
330 XML", W3C REC REC-xml-names-19990114, January 1999.
332 Author's Address
334 James M Snell
336 Phone:
337 Email: jasnell@gmail.com
338 URI: http://snellspace.com
340 Appendix A. Acknowledgements
342 The author gratefully acknowledges the feedback from the members of
343 Atom Publishing Format and Protocol working group during the
344 development of this specification.
346 Intellectual Property Statement
348 The IETF takes no position regarding the validity or scope of any
349 Intellectual Property Rights or other rights that might be claimed to
350 pertain to the implementation or use of the technology described in
351 this document or the extent to which any license under such rights
352 might or might not be available; nor does it represent that it has
353 made any independent effort to identify any such rights. Information
354 on the procedures with respect to rights in RFC documents can be
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357 Copies of IPR disclosures made to the IETF Secretariat and any
358 assurances of licenses to be made available, or the result of an
359 attempt made to obtain a general license or permission for the use of
360 such proprietary rights by implementers or users of this
361 specification can be obtained from the IETF on-line IPR repository at
362 http://www.ietf.org/ipr.
364 The IETF invites any interested party to bring to its attention any
365 copyrights, patents or patent applications, or other proprietary
366 rights that may cover technology that may be required to implement
367 this standard. Please address the information to the IETF at
368 ietf-ipr@ietf.org.
370 Disclaimer of Validity
372 This document and the information contained herein are provided on an
373 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
374 OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
375 ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
376 INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
377 INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
378 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
380 Copyright Statement
382 Copyright (C) The Internet Society (2005). This document is subject
383 to the rights, licenses and restrictions contained in BCP 78, and
384 except as set forth therein, the authors retain all their rights.
386 Acknowledgment
388 Funding for the RFC Editor function is currently provided by the
389 Internet Society.