(eXtensible Markup Language) A widely used system for defining data formats. XML provides a very rich system to define complex documents and data structures such as invoices, molecular data, news feeds, glossaries, inventory descriptions, real estate properties, etc.

As long as a programmer has the XML definition for a collection of data (often called a “schema”) then they can create a program to reliably process any data formatted according to those rules.

XML is a subset of the older SGML specification – the definition of XML is SGML minus a couple of dozen items.

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