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[3] 
[DFN[[CODE[Keywords:]]]]
は、
[[メッセージ]]の内容に関係する[[キーワード]]を表します。

* 関連

-[[電子ニュース]]
--[[新聞組]]
--[[RFC1036]]
--[[son-of-RFC1036]]
--[[draft-usefor-article]]

* 歴史

[FIG(quote)[ [2] [[son-of-RFC1036]] 6.8. Keywords

The  Keywords header content is one or more phrases intended
          to describe some aspect of the content of the article:

Keywords-content = plain-phrase *( "," [ space ] plain-phrase )

Keywords, separated  by  commas,  each  follow  the  <plain-
          phrase>  syntax  defined  in  section 5.2.  Encoded words in
          keywords MUST not contain characters other than letters  (of
          either case), digits, and the characters "!", "*", "+", "-",
          "/", "=", and "_".

NOTE: Posters and posting agents are asked to take
               note that keywords are separated by commas, not by
               white space.  The following Keywords  header  con-
               tains  only  one  keyword  (a  rather unlikely and
               improbable one):

参考: 投稿者と投稿代理者はキーワードは空白間隔ではなしに
読点(コンマ)で区切ることに注意して下さい。次の Keywords 頭は
キーワード1つだけ (ありそうもないですけど。) が含まれます。

Keywords: Thompson Ritchie Multics Linux

and should probably have been written:

おそらく次のように書くべきでした。

Keywords: Thompson, Ritchie, Multics, Linux

This  particular  error  is  unfortunately  rather widespread.

残念なことにこの間違いは広く行われています。

NOTE:   Reading  agents  and  archivers  preparing
               indexes of articles should bear in mind that user-
               chosen  keywords are notoriously poor for indexing
               purposes unless the keywords  are  picked  from  a
               predefined  set (which they are not in this case).
               Also, some followup agents unwisely propagate  the
               Keywords  header  from the precursor into the fol-
               lowup by default.  At least one news-based experi-
               ment has found the contents of Keywords headers to
               be completely valueless for indexing.
]FIG]

** RFC 5336

[1] [CITE@en[RFC 5536 - Netnews Article Format]]
( ([TIME[2014-09-21 18:14:06 +09:00]] 版))
<http://tools.ietf.org/html/rfc5536#section-3.2>

* メモ

Historical Legal Sensitive Parent: [Help / License]

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