[1] Post Type Discovery (2016-07-27 05:20:20 +09:00) https://www.w3.org/TR/2016/WD-post-type-discovery-20160728/

[2] Post Type Discovery (2016-10-28 09:33:04 +09:00) https://www.w3.org/TR/2016/WD-post-type-discovery-20161028/

[3] Post Type Discovery (2017-06-14 09:37:16 +09:00) https://www.w3.org/TR/2017/WD-post-type-discovery-20170614/

[4] Post Type Discovery (2017-08-02 01:46:09 +09:00) https://www.w3.org/TR/2017/WD-post-type-discovery-20170801/

[5] Post Type Discovery (2018-01-18 22:28:25 +09:00) https://www.w3.org/TR/2018/NOTE-post-type-discovery-20180118/

[6] Post Type Discovery (2018-01-13 08:55:18 +09:00) http://ptd.spec.indieweb.org/

[7] Post Type Discovery (2018-01-18 22:28:25 +09:00) https://www.w3.org/TR/2018/NOTE-post-type-discovery-20180118/