[1] [CITE@en[Schema.org Actions - schema.org]]
( ([TIME[2015-02-12 17:08:38 +09:00]] 版))
<http://schema.org/docs/actions.html>

[2] [CITE[schema blog: Announcing Schema.org Actions]]
( ([TIME[2015-02-06 23:21:37 +09:00]] 版))
<http://blog.schema.org/2014/04/announcing-schemaorg-actions.html>