[1] [CITE@en-us[Tantek's Thoughts]]
([[Tantek Çelik]] 著, [TIME[2009-09-26 13:24:11 +09:00]] 版)
<http://tantek.com/log/2005/06.html#d03t2359>

[2] [CITE[''''''[''''''whatwg'''''']'''''' Extensible microdata attributes]]
( ([TIME[2011-04-28 00:07:52 +09:00]] 版))
<http://lists.whatwg.org/htdig.cgi/whatwg-whatwg.org/2011-April/031343.html>