eXtensible Markup Language: a simplified version of SGML that can be used, esp. on the World Wide Web, to create a tagging scheme that allows elements of a document to be marked according to their content rather than their format.
XML (ěks'ěm-ěl') n. A metalanguage written in SGML that allows one to design a markup language, used to allow for the easy interchange of documents on the World Wide Web.
XML (ěks'ěm-ěl') Pronunciation Key
Short for extensible markup language. A version of SGML that allows one to design a customized markup language, used to allow for the easy interchange of documents and data on the World Wide Web or between software components.