XML

Extensible Markup Language
The Extensible Markup Language (XML) is a W3C-recommended general-purpose markup language for creating special-purpose markup languages. It is a simplified subset of SGML, capable of describing many different kinds of data. Its primary purpose is to facilitate the sharing of structured text and information across the Internet. Languages based on XML are themselves described in a formal way, allowing programs to modify and validate documents in these languages without prior knowledge of their form.