XML - Extensible Markup Language (XML)
A subset of the SGML language in which tags, similar to those used in HTML, define the kind of information contained in a data element (i.e., product number, price, etc.), rather than how it is displayed. "Extensible" means that in XML tags are not limited and predefined as they are in HTML, but must be created and defined by the person producing the Web page. XML can be used with HTML in the same Web document. The most elaborate XML vocabularies are those developed to support business-to-business transactions.
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http://vax.wcsu.edu/library/odlis.html#xml
http://www.netlingo.com/inframes.cfm;