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* フィード形式

[9] [[フィード]]を記述する構文はいろいろあります。

[FIG(short list)[
- [[RSS 2.0]]
- [[Atom 1.0]]
- [[SmartFormat]]
- [[JSON Feed]]

[HISTORY[
- [[CDF]]
- [[RSS 0.9]]
- [[RSS 0.9x]]
- [[RSS 1.0]]
- [[RSS 1.1]]
- [[RSS 3.0]]
- [[Atom 0.3]]
- [[hAtom]]
- [[jRSS]]
]HISTORY]

]FIG]

[22] 名前が似ていても中身が大違いということが多いです。

* 応用

[12] 幾つかの種類があります。
[FIG(list middle)[
- 更新情報
- [[OpenSearch]]
- [[Podcast]]
- [[AtomPub]]
- [[Activity Streams]]
- [[PuSH]]
- [[CAP]]
]FIG]

* 統計

[13] [[フィード2016年2月]]

* 実例

[17] [[フィードいろいろ]]

* メモ

[16] [[フィード]]内の各項目の [[URL]] は、すべて異なる場合もあれば、
同じものが含まれる場合 (更新があるたびに追加されていくが、同じ [[URL]]
の古い更新も消さない場合) もあります。

[1]
[CITE@ja[Firefox 2 でフィードの XSLT を有効にする: Days on the Moon]] ([CODE[2007-01-19 23:55:25 +09:00]] 版) <http://nanto.asablo.jp/blog/2006/10/28/577849>
([[名無しさん]])

[2]
[CITE@ja[ちょっとしたメモ - IE7、Firefox2でもRSS1.0にXSLTを適用させる]] ([[Masahide Kanzaki]] 著, [TIME[2008-05-28 09:21:23 +09:00]] 版) <http://www.kanzaki.com/memo/2006/11/06-1>

[4]
[CITE@ja[Firefox のフィードアイコンのメニュー: Days on the Moon]] ([CODE[2007-01-19 23:58:54 +09:00]] 版) <http://nanto.asablo.jp/blog/2007/01/19/1124194>
([[名無しさん]] [WEAK[2007-01-19 15:43:20 +00:00]])

[5]
[CITE[Index of /testcases]] ([CODE[2007-02-08 09:50:05 +09:00]] 版) <http://feedvalidator.org/testcases/>
([[名無しさん]] [WEAK[2007-02-08 13:38:24 +00:00]])

[6]
[CITE@en[Documentation '''['''Universal Feed Parser''']''']] ([TIME[2008-11-08 18:34:57 +09:00]] 版) <http://feedparser.org/docs/index.html>

[7] [CITE@ja[スラッシュドット・ジャパン | RSS フィードの妥当な内容量はどれ位?]] ([TIME[2008-11-26 06:17:46 +09:00]] 版) <http://slashdot.jp/it/article.pl?sid=08/11/25/1230233>

[8] [CITE[IRC logs: freenode / #whatwg / 20091006]]
([TIME[2009-12-05 08:58:19 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20091006#l-514>

[10] [CITE@en[BitTorrent.org]]
( ([[Arvid Norberg <arvid@bittorrent.com>]] 著, [TIME[2014-09-29 05:34:53 +09:00]] 版))
<http://www.bittorrent.org/beps/bep_0036.html>

[3] [CITE@en[338621 – Feed View overrides XSLT stylesheet defined in XML document]]
([TIME[2015-05-04 11:57:14 +09:00]] 版)
<https://bugzilla.mozilla.org/show_bug.cgi?id=338621>

[FIG(quote)[
[FIGCAPTION[
[11] [CITE@en[338621 – Feed View overrides XSLT stylesheet defined in XML document]]
([TIME[2015-05-04 11:57:52 +09:00]] 版)
<https://bugzilla.mozilla.org/show_bug.cgi?id=338621#c1>
]FIGCAPTION]

> The emerging workaround for this problem (which isn't new to us, since we're using the same heuristic that IE7 betas have been using for months) is to put in a comment ranting about the evils of sniffing web content and overriding the desires of web developers which is long enough to move "<rss" or "<feed" out of the first 512 bytes, since that's all we sniff.
> There's no way we can tell the difference between XSLT intended to style a feed into something that's not a feed, like yours, and XSLT intended to just keep people with earlier browsers from having to look at raw XML, so I think this is WONTFIX. With more than 99% of the feeds with stylesheets just trying to do what we're doing, but without the knowledge of what aggregators the user actually uses and without the chrome privileges to subscribe them, not using our transformation on feeds that have a stylesheet would just make for a worse and less consistent experience for our users.

]FIG]

[14] [CITE[Official Google Reader Blog: Namespaced Extensions in Feeds]]
([TIME[2015-11-16 05:29:53 +09:00]] 版)
<http://googlereader.blogspot.jp/2006/08/namespaced-extensions-in-feeds.html>

[15] [CITE[Official Google Reader Blog: XML Errors in Feeds]]
([TIME[2015-11-16 05:29:53 +09:00]] 版)
<http://googlereader.blogspot.jp/2005/12/xml-errors-in-feeds.html>

[FIG(quote)[
[FIGCAPTION[
[18] [CITE@en[VLC command-line help - VideoLAN Wiki]]
([TIME[2017-10-10 19:17:15 +09:00]])
<https://wiki.videolan.org/VLC_command-line_help/>
]FIGCAPTION]

>  RSS and Atom feed display
>  Display a RSS or ATOM Feed on your video

]FIG]

[FIG(quote)[
[FIGCAPTION[
[19] [CITE@ja[はてなブックマークでのAtomフィード配信の終了と、フィードのページング仕様の変更のお知らせ - はてなブックマーク開発ブログ]]
([TIME[2018-10-09 23:44:39 +09:00]])
<http://bookmark.hatenastaff.com/entry/2018/10/01/110025>
]FIGCAPTION]

> Atom APIの廃止に伴い、Atom出版プロトコルでの編集ができなくなり、Atom配信フォーマットでのフィード配信の利点がなくなる点があります。また、同等の内容をRSSフォーマットでも配信しているため、現代の潮流を加味し、RSSフォーマットに一本化するためです。

]FIG]

[20] 
えっいつの間にか RSS vs Atom 戦争決着してたの??

膠着状態でどっちも死滅してフィードがなくなるのが「現代の潮流」
かと思ってたけど[CITE[はてなブックマーク]]の中の人とは違う世界線の現代なのかな??

[FIG(quote)[
[FIGCAPTION[
[21] [CITE@en-US[Feed reader replacements for Firefox | Firefox Help]]
([TIME[2018-10-17 21:03:57 +09:00]])
<https://support.mozilla.org/en-US/kb/feed-reader-replacements-firefox>
]FIGCAPTION]

> Firefox's built-in support for web feeds and Live Bookmarks will be removed starting with the release of Firefox version 64 in December 2018.

]FIG]

[23] [CITE@en[Chromium Blog: An experiment in helping users and web publishers create deeper connections on Chrome]], [TIME[2021-05-21T22:42:01.000Z]], [TIME[2021-05-23T11:48:54.092Z]] <https://blog.chromium.org/2021/05/an-experiment-in-helping-users-and-web.html>

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