I mean YAML has tags (!!MyType) and built-in types like date etc which XML does not. It also solved the "no" issue and many corener caes in YAML 1.2 which has

I mean YAML has tags (!!MyType) and built-in types like date etc which XML does not. It also solved the "no" issue and many corener caes in YAML 1.2 which has been out for 15 years or so, but libraries have not upgraded.