<html xmlns="http://www.w3.org/1999/xhtml"><head></head><body><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="1" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[1]</anchor-end> <dfn>R-LDH ラベル</dfn> (<dfn><rubyb xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">予約<rt xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">reserved</rt></rubyb> LDH <rubyb xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">ラベル<rt xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">label</rt></rubyb></dfn>)
は、<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">LDHラベル</anchor>のうち、3文字目と4文字目が共に「<code class="char"><anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">-</anchor></code>」 であるものをいいます。
<src xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:10:"><anchor-internal xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="4" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">&gt;&gt;4</anchor-internal></src></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="3" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[3]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">R-LDHラベル</anchor>は<dfn><rubyb xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">タグ付きドメイン名<rt xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">tagged domain name</rt></rubyb></dfn>とも呼ばれています。
<src xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:10:"><anchor-internal xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="4" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">&gt;&gt;4</anchor-internal></src></p><section><h1>仕様書</h1><ul><li><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="6" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[6]</anchor-end> <cite xml:lang="en">RFC 5890 - Internationalized Domain Names for Applications (IDNA): Definitions and Document Framework</cite> <ul><li><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="4" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[4]</anchor-end> <strong><anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://tools.ietf.org/html/rfc5890#page-8">http://tools.ietf.org/html/rfc5890#page-8</anchor-external></strong></li></ul></li><li><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="7" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[7]</anchor-end> <cite xml:lang="en">RFC 5894 - Internationalized Domain Names for Applications (IDNA): Background, Explanation, and Rationale</cite> (<time>2011-02-05 07:34:29 +09:00</time> 版) <anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="http://tools.ietf.org/html/rfc5894#section-1.2.2">http://tools.ietf.org/html/rfc5894#section-1.2.2</anchor-external></li></ul></section><section><h1>分類</h1><figure class="short list"><figcaption><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="9" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[9]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">R-LDHラベル</anchor></figcaption><ul><li><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="2" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[2]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">XNラベル</anchor></li><li><code>zz--</code></li></ul></figure></section><section><h1>メモ</h1><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="5" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[5]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">IDNA</anchor> では、 <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">XNラベル</anchor>以外の<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">R-LDHラベル</anchor>は将来のために予約されているものであって、
通常の<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">LDHラベル</anchor>として処理しては<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:"><strong xmlns="http://www.w3.org/1999/xhtml">なりません</strong></anchor>。また、同じ<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">ゾーン</anchor>に 
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">IDNAラベル</anchor>と混在させる<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:"><strong xmlns="http://www.w3.org/1999/xhtml">べきではありません</strong></anchor>。 <src xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:10:"><anchor-internal xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="4" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">&gt;&gt;4</anchor-internal></src></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="8" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[8]</anchor-end> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">R-LDHラベル</anchor>という概念は、 <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">IDNA</anchor> 以前の符号化の方法との混乱を避けるため、
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">ACE接頭辞</anchor>を変更しての拡張の余地をなくすため (あり得なそうではあるものの)、
<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">Punycode</anchor> <anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">算法</anchor>自体を通じた攻撃の余地を減らすための3つの理由で必要とされています
<src xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:10:"><anchor-internal xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="7" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">&gt;&gt;7</anchor-internal></src>。</p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="10" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[10]</anchor-end> <cite xml:lang="en">IDNA: use proposed UTS46 flags to avoid breaking YouTube</cite>
(<anchor xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:">annevk</anchor>著, <time>2017-06-02 06:24:01 +09:00</time>)
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://github.com/whatwg/url/commit/dc9d83106cada9af507bf37dee3973de97b020fd">https://github.com/whatwg/url/commit/dc9d83106cada9af507bf37dee3973de97b020fd</anchor-external></p><p><anchor-end xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:anchor="11" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:">[11]</anchor-end> <cite xml:lang="en">Address several IDNA issues by annevk · Pull Request #309 · whatwg/url</cite>
(<time>2017-09-03 21:24:40 +09:00</time>)
<anchor-external xmlns="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resScheme="URI" xmlns:a0="urn:x-suika-fam-cx:markup:suikawiki:0:9:" a0:resParameter="https://github.com/whatwg/url/pull/309">https://github.com/whatwg/url/pull/309</anchor-external></p></section></body></html>