by Lee Underwood
Extensible Markup Language (XML) is a simple, very flexible text format derived from SGML. Originally designed to meet the challenges of large-scale electronic publishing, XML is also playing an increasingly important role in the exchange of a wide variety of data on the Web and elsewhere. (Taken from the W3C)
XML has emerged not so much as another new technology added on to the pile that is straining the Web, but rather as a reassertion of one of the original principles that made the Web possible: Simplicity.
The links below have been assembled to help you, no matter what your level of XML expertise.
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Specifications and Usage
Editors and Tools