ABSTRACT
XML, the Extensible Markup Language, is a syntax for tagging, or marking-up, textual information. It is often described as a metalanguage because it provides a set of rules from which other, data-specific, markup-based languages may be created. As a syntax, XML does not exist in any form apart from its application in these data-specific languages. One of XML’s strengths is that it may be used in its most simple form, as a set of markup rules used to create XML documents, or with a host of other XML-related standards and technologies. These additional standards and technologies increase its usefulness, and also its complexity.
