eXtensible Markup Language
Flexible way to create common information formats and share both the format and the data contents on the World Wide Web, intranets or elsewhere.
XML documents can have different style formats (see CSS and XSL ) can be manipulated from within a HTML page (see DOM for this).
XML was developed first by the XML Working Group of the W3C as a streamlined subset of SGML , designed specifically for delivering information on the net.