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--------------------------------------------------------------------------------
2 Network Working Group J. Snell
3 Internet-Draft August 2005
4 Expires: February 2, 2006
6 Atom Link No Follow
7 draft-snell-atompub-feed-nofollow-00.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 feed publishers to express
41 preferences over how a consumer processes Atom links and Content-By-
42 Reference.
44 Table of Contents
46 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
47 2. Notational Conventions . . . . . . . . . . . . . . . . . . . . 3
48 3. The 'x:follow' extension attribute . . . . . . . . . . . . . . 4
49 4. The 'x:index' extension attribute . . . . . . . . . . . . . . 4
50 5. The 'x:archive' extension attribute . . . . . . . . . . . . . 5
51 6. Security Considerations . . . . . . . . . . . . . . . . . . . 6
52 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
53 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
54 Author's Address . . . . . . . . . . . . . . . . . . . . . . . 6
55 A. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6
56 Intellectual Property and Copyright Statements . . . . . . . . 7
58 1. Introduction
60 This docoument specifies a mechanism by which feed publishers MAY
61 express how applications consuming Atom documents should handle links
62 and referenced content contained within the feed. For example, a
63 publisher may include an enclosure link within a feed but may not
64 wish for applications to automatically download the enclosed file
65 when it processes the feed; or, the publisher may not wish to allow
66 applications to archive or index the enclosure in any way. The
67 'follow', 'index' and 'archive' attributes introduced herein provide
68 the means for publishers to express these preferences.
69 noFollowAttributes = {
70 attribute follow { "yes" | "no" }?,
71 attribute index { "yes" | "no" }?,
72 attribute archive { "yes" | "no" }?
73 }
75 2. Notational Conventions
77 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
78 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
79 document are to be interpreted as described in BCP 14, [RFC2119], as
80 scoped to those conformance targets.
82 In this specification, "entry" refers to an atom:entry element.
84 In this specification, "feed" refers to an Atom Feed Document.
86 In this specification, "head section" refers to the children of a
87 feed's document-wide metadata container; e.g., the child elements of
88 the atom:feed element in an Atom Feed Document.
90 In this specification, the term "extension attribute" refers to a
91 namespace qualified element attribute.
93 In this specification, the term "link" refers to an atom:link
94 element.
96 In this specificaiton, the term "referenced content" refers to an
97 atom:content element that contains a @src attribute.
99 This specification uses XML Namespaces [W3C.REC-xml-names-19990114]
100 to uniquely identify XML element and attribute names. It uses the
101 following namespace prefix for the indicated namespace URI;
102 "x": "http://purl.org/atompub/nofollow/1.0"
104 This specification uses terms from the XML Infoset [W3C.REC-xml-
105 infoset-20040204]. However, this specification uses a shorthand; the
106 phrase "Information Item" is omitted when naming Element Information
107 Items. Therefore, when this specification uses the term "element,"
108 it is referring to an Element Information Item in Infoset terms.
110 3. The 'x:follow' extension attribute
112 The 'x:follow" attribute indicates whether applications should
113 automatically attempt to follow links and referenced content (e.g.,
114 whether or not enclosure links should be automatically downloaded,
115 etc). The value of the attribute is either "yes" or "no". If
116 missing, the value is considered to be "yes". A value of "no"
117 indicates that applications SHOULD NOT attempt to automatically
118 resolve the referenced resource -- rather, the application should
119 wait until a user explicitly requests the resource to be resolved.
121 For example,
122
124 ...
125 ...
126
129 ...
130
132 The 'x:follow' attribute MAY be contained by atom:link elements and
133 atom:content elements that contain a 'src' attribute.
135 4. The 'x:index' extension attribute
137 The 'x:index' attribute indicates whether applications should index
138 links and referenced content. The value of the attribute is either
139 "yes" or "no". If missing, the value is considered to be "yes". A
140 value of "no" indicates that applications SHOULD NOT index the
141 referenced resource.
142
144 ...
145 ...
146
149 ...
150
152 The 'x:index' attribute MAY also be included as a child of atom:feed
153 and atom:entry elements -- in which case it is used to indicate
154 whether or not applications should index the information content of
155 the containing atom:feed or atom:entry.
156
159 ...
160 ...
161 ...
162
164 The 'x:index' attribute MAY be contained by atom:entry, atom:feed,
165 atom:link elements and atom:content elements that contain a 'src'
166 attribute.
168 5. The 'x:archive' extension attribute
170 The 'x:archive' attribute indicates whether applications should
171 archive the targets of links and content references. The value of
172 the attribute is either "yes" or "no". If missing, the value is
173 considered to be "yes". A value of "no" indicate that applications
174 SHOULD NOT archive the referenced resource.
175
177 ...
178 ...
179
182 ...
183
185 The 'x:archive' attribute MAY also be included as a child of atom:
186 feed and atom:entry elements -- in which case it is used to indicate
187 whether or not applications should archive the information content of
188 the containing atom:feed or atom:entry.
189
192 ...
193 ...
194 ...
195
197 The 'x:archive' attribute MAY be contained by atom:entry, atom:feed,
198 atom:link elements and atom:content elements that contain a 'src'
199 attribute.
201 6. Security Considerations
203 There are no security considerations introduced by this
204 specification.
206 7. IANA Considerations
208 There are no IANA considerations introduced by this specification.
210 8. References
212 [I-D.ietf-atompub-format]
213 Sayre, R. and M. Nottingham, "The Atom Syndication
214 Format", draft-ietf-atompub-format-11 (work in progress),
215 August 2005.
217 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
218 Requirement Levels", BCP 14, RFC 2119, March 1997.
220 [W3C.REC-xml-infoset-20040204]
221 Tobin, R. and J. Cowan, "XML Information Set (Second
222 Edition)", W3C REC REC-xml-infoset-20040204,
223 February 2004.
225 [W3C.REC-xml-names-19990114]
226 Hollander, D., Bray, T., and A. Layman, "Namespaces in
227 XML", W3C REC REC-xml-names-19990114, January 1999.
229 [W3C.REC-xmlschema-2-20041028]
230 Malhotra, A. and P. Biron, "XML Schema Part 2: Datatypes
231 Second Edition", W3C REC REC-xmlschema-2-20041028,
232 October 2004.
234 Author's Address
236 James M Snell
238 Phone:
239 Email: jasnell@gmail.com
240 URI: http://snellspace.com
242 Appendix A. Acknowledgements
244 The author gratefully acknowledges the feedback from the members of
245 the Atom Publishing Format and Protocol working group during the
246 development of this specification.
248 Intellectual Property Statement
250 The IETF takes no position regarding the validity or scope of any
251 Intellectual Property Rights or other rights that might be claimed to
252 pertain to the implementation or use of the technology described in
253 this document or the extent to which any license under such rights
254 might or might not be available; nor does it represent that it has
255 made any independent effort to identify any such rights. Information
256 on the procedures with respect to rights in RFC documents can be
257 found in BCP 78 and BCP 79.
259 Copies of IPR disclosures made to the IETF Secretariat and any
260 assurances of licenses to be made available, or the result of an
261 attempt made to obtain a general license or permission for the use of
262 such proprietary rights by implementers or users of this
263 specification can be obtained from the IETF on-line IPR repository at
264 http://www.ietf.org/ipr.
266 The IETF invites any interested party to bring to its attention any
267 copyrights, patents or patent applications, or other proprietary
268 rights that may cover technology that may be required to implement
269 this standard. Please address the information to the IETF at
270 ietf-ipr@ietf.org.
272 Disclaimer of Validity
274 This document and the information contained herein are provided on an
275 "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
276 OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
277 ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
278 INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
279 INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
280 WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
282 Copyright Statement
284 Copyright (C) The Internet Society (2005). This document is subject
285 to the rights, licenses and restrictions contained in BCP 78, and
286 except as set forth therein, the authors retain all their rights.
288 Acknowledgment
290 Funding for the RFC Editor function is currently provided by the
291 Internet Society.