What Is XML ?

 What Is XML? eXtensible Markup Language Defining File Format
eXtensible Markup Language
XML
     A widely used system for defining file formats. XML provides a very rich system to define complex documents and file 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.

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 What Is XML? eXtensible Markup Language Defining File Format