SEP 33: Substantive revision metadata

Documents on this site have three datetime related metadata keys:

created:   when the document was first created
   updated:   the last time the documents content was updated
   published: when the document was first published

Issa Rice adds another dimension to this by distinguishing modification from substantive revision. I’m not convinced of the utility of this but I’m filing a proposal so that I can think it over again at a later date.