XML (1998): ancient
JSON (2001): modern
JSON (2001): modern
@tymwol @einarwh Last time I heard about Y U NOT YAML for something was because "edge cases" that JSON didn't have.
Plus, XML is still the option for finantial, military and medical, because is strict as fuck. Even if strict, what winds me down is the amount of boilerplate you have to put to manipulate it.
PERL (1987): ancient
Python (1991): modern