2016-03-18 UTC
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tantek either those examples will led to refinement (or rewriting) of https://indiewebcamp.com/post-type-discovery#Feature_consideration_checkin OR we may "give up" and end up with creating a new property like "p-checkin" that is similar to "p-location", just as we added "u-like-of" which is similar in that regard to "u-in-reply-to"