XML (Extensible Markup Language)

A markup language that enables users to tag data in order to delimit it, leaving the interpretation of the data to the applications that read it. Unlike Hypertext Markup Language (HTML), which describes the appearance of data, XML describes the structure of data. This makes XML compatible with IBM® Lotus® Domino™, which stores data in structured documents, separate from its presentation.

eXtensible Markup Language is a data representation method.

A universal format for structured documents and data on the Web having the potential to alleviate many of the interoperability problems associated with the sharing of documents and data Also referred to as XML.