[4] [DFN[[CODE(conneg)[description]]]] [[属性]]は、
[[異体説明]]の中で使って、
その[[異体]]についての文章による簡単な説明を値とします。

* 構文 

-[3] [CODE(ABNF)[[DFN[description]] := "{" "description" [[quoted-string]] [ [[language-tag]] ] "}"]]

[6] [[引用文字列]]は、説明文です。

[7] [[言語タグ]]は、その説明文の[[言語]]です。
省略された場合の解釈は明言されていません。

* 例
-[2] [SAMP(conneg)[ {"paper.2" 0.7 {type text/html} {language ja} {description "Japanese language version, written in Hypertext Markup Language"}} ]]

* 歴史

[FIG(quote)[ [1] [[RFC 2295]] (HTTP 透過内容折衝) 5.6 Description

> The description attribute gives a textual description of the variant.
It can be included if the URI and normal attributes of a variant are
considered too opaque to allow interpretation by the user.  If a user
agent is showing a menu of available variants compiled from a variant
list, and if a variant has a description attribute, the user agent
SHOULD show the description attribute of the variant instead of
showing the normal attributes of the variant.  The description field
uses the UTF-8 character encoding scheme [5], which is a superset of
US-ASCII, with ""%" HEX HEX" encoding.  The optional language tag MAY
be used to specify the language used in the description text.
]FIG]

* メモ