| Glossary > Computers >XML
XML Extensible Markup Language is a subset of ISO 8879, Standard Generalized Markup Language (SGML). XML has been designed specifically to function on the Web, and both major browsers support it. Currently a formal recommendation from the World Wide Web Consortium (W3C), XML is similar to HTML in that both XML and HTML contain markup symbols to describe the contents of a page or file. HTML, however, describes the content of a Web page only in terms of how it is to be displayed. XML describes the content in terms of what the data is that is being described. For example the tags could indicate that the data following it was an author's name and his affiliation. This allows an XML file to be processed purely as data by a program as well as being displayed in a certain way. XML is "extensible" because, unlike HTML, the markup symbols are unlimited and self-defining.
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