Greg Wilson on Nostr: apologies if I'm mis-remembering a long-ago lecture, but I believe the ability to ...

apologies if I'm mis-remembering a long-ago lecture, but I believe the ability to report semantically meaningful changes was one of the motivations for development of GML (the predecessor of SGML). I have seen people pull up contract changes in Lexis Nexis, which I believe uses some derivative of SGML as a storage format (?).