Before the arrival of Mac OS X, our Macs had remained almost free from the property lists and other XML files that now seem to fill them. Those owe their origin to the grandfather of markup languages, SGML, originally known as Generalised Markup Language.
https://eclecticlight.co/2025/08/16/a-brief-history-of-xml-and-property-lists/
Références
Charles F Goldfarb (1996) The Roots of SGML – A Personal Recollection, Wayback Machine (Les racines du SGML)
SGML sur Wikipédia
XML sur Wikipédia
Listes de biens sur Wikipédia