How is xml defined

Even though there are only 5 declared entities, more can be added using the document's Document Type Definition. One way to style XML output is to specify CSS to apply to the document using the xml-stylesheet processing instruction.

This makes XML incredibly versatile. This article is obviously only a very brief introduction to what XML is, with a few small examples and references to get you started.

For more details about XML, you should look around on the Web for more in-depth articles. We just launched W3Schools videos. Get certified by completing a course today! If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:. Report Error. Your message has been sent to W3Schools. W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning. Extensible Markup Language XML is a universal format, maintained by the W3C, used for representation and transfer of structured data on the web or between different applications.

Simplicity, portability, platform independence, and usability are some of the key features that have resulted in the increasing popularity of the use of XML-based standards.

XML has been the main source of motivation for development of service oriented architecture SOA platforms such as web services that are not tied to any particular language and collaborate effectively in heterogeneous environments. By: Justin Stoltzfus Contributor, Reviewer. By: Satish Balakrishnan. Dictionary Dictionary Term of the Day. Natural Language Processing.