[1] [CITE@en[Plain Old XML - Wikipedia, the free encyclopedia]]
([TIME[2015-04-02 21:03:08 +09:00]] 版)
<http://en.wikipedia.org/wiki/Plain_Old_XML>

[2] [CITE@en[plain-old-xml-considered-harmful · Microformats Wiki]]
([TIME[2013-09-18 00:51:51 +09:00]] 版)
<http://microformats.org/wiki/plain-old-xml-considered-harmful>

[3] [CITE[Plain Old XML / Plain Old ほげほげ - naoyaのはてなダイアリー]]
([TIME[2014-12-12 09:20:45 +09:00]] 版)
<http://d.hatena.ne.jp/naoya/20060226/1140933160>

[4] [CITE[POX over HTTP - naoyaのはてなダイアリー]]
([TIME[2014-12-12 09:20:45 +09:00]] 版)
<http://d.hatena.ne.jp/naoya/20060303/1141381256>