XML - Wikipedia
https://en.wikipedia.org/wiki/XML
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.
XML Tutorial
https://www.w3schools.com/xml/default.asp
Why Study XML? XML plays an important role in many different IT systems. XML is often used for distributing data over the Internet. It is important (for all types of software developers!) to have a good...
Extensible Markup Language (XML)
https://www.w3.org/XML/
Extensible Markup Language (XML) is a simple, very flexible text format derived from SGML (ISO Work at W3C takes place in Working Groups. The Working Groups within the XML Activity are listed...