[1] Schema.org Actions - schema.org ( (2015-02-12 17:08:38 +09:00 版)) http://schema.org/docs/actions.html
[2] schema blog: Announcing Schema.org Actions ( (2015-02-06 23:21:37 +09:00 版)) http://blog.schema.org/2014/04/announcing-schemaorg-actions.html