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Part V: Advanced Technologies > Introduction to XML

Chapter 30. Introduction to XML

XML (Extensible Markup Language) is a document encoding or markup standard that has been approved by the World Wide Web Consortium. XML is not so much a language in itself (like HTML), but rather a set of rules for creating other markup languages. It is a metalanguage used to define other languages. If this all sounds highfalutin to you, think of it this way: XML provides a way for you to make up your own tags! This is a powerful new tool for exchanging meaningful information.

Consider these two examples, the first using standard HTML markup, the second using a markup language written according to the rules of XML:


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