[1] [CITE[IRC logs: freenode / #whatwg / 20100121]]
([TIME[2010-01-23 15:13:04 +09:00]] 版)
<http://krijnhoetmer.nl/irc-logs/whatwg/20100121#l-168>

[2] [CITE[IRC logs: freenode / #whatwg / 20110609]]
( ([TIME[2011-06-16 23:01:17 +09:00]] 版))
<http://krijnhoetmer.nl/irc-logs/whatwg/20110609>

[3] [CITE@en[Web Applications 1.0 r6668        Redefine itemtype='' to allow multiple types if they share the same vocabulary. This was by far the most frequently made request at the recent schema.org event]]
( ([TIME[2011-10-12 09:13:00 +09:00]] 版))
<http://html5.org/tools/web-apps-tracker?from=6667&to=6668>