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PHP Advanced and Object-Oriented Programming: Visual Quickpro Guide, Third Edition by Larry Ullman

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13. XML and PHP

XML, the Extensible Markup Language, is one of the most important technologies in computing. With a range of uses, from sharing data between computers to storing data for a single application, XML provides a format for representing not just information but also information about the information (aka meta-information). XML, like HTML, is based on Standard Generalized Markup Language (SGML), which means that you’ll see numerous similarities between the two.

This chapter begins with a basic introduction to XML: what it is, the proper XML syntax, and how to make your own XML document. ...

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