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Valid XML document

XML
Filename extension .xml
Internet media type
  • application/xml
  • text/xml
Uniform Type Identifier (UTI) public.xml
UTI conformation public.text
Developed by World Wide Web Consortium
Type of format Markup language
Extended from SGML
Extended to
Standard
Open format? Yes
Extensible Markup Language (XML)
Status Published
Year started 1996; 21 years ago (1996)
Editors
Related standards XML Schema
Domain Data serialization
Abbreviation XML
Website XML 1.0

In computing, Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The W3C's XML 1.0 Specification and several other related specifications—all of them free open standards—define XML.

The design goals of XML emphasize simplicity, generality, and usability across the Internet. It is a textual data format with strong support via Unicode for different human languages. Although the design of XML focuses on documents, the language is widely used for the representation of arbitrary data structures such as those used in web services.

Several schema systems exist to aid in the definition of XML-based languages, while programmers have developed many application programming interfaces (APIs) to aid the processing of XML data.

Hundreds of document formats using XML syntax have been developed, including RSS, Atom, SOAP, SVG, and XHTML. XML-based formats have become the default for many office-productivity tools, including Microsoft Office (Office Open XML), OpenOffice.org and LibreOffice (OpenDocument), and Apple's iWork. XML has also provided the base language for such as . Applications for the Microsoft .NET Framework use XML files for configuration. Apple has an implementation of a registry based on XML.


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