High Quality Content by WIKIPEDIA articles! XML documents have a hierarchical structure and can conceptually be interpreted as a tree structure, called an XML tree. This tree structure can not be divided into just root, nodes and leaves as normal tree structures. Extensible Markup Language (XML) is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards. XML's design goals emphasize simplicity, generality, and usability over the Internet. It is a textual data format with strong support via Unicode for the languages of the world. Although the design of XML focuses on documents, it is widely used for the representation of arbitrary data structures, for example in web services.

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