Introduction to XML
http://www-106.ibm.com/developerworks/edu/x-dw-xmlintro-i.html?S_TACT=104AHW06&S_CMP=EP

Tidwell, Doug
IBM
2002

Abstract:

XML, the Extensible Markup Language, has gone from the latest buzzword to an entrenched eBusiness technology in record time. This newly revised tutorial discusses what XML is, why it was developed, and how it's shaping the future of electronic commerce. It also covers a variety of important XML programming interfaces and standards, and ends with two case studies showing how companies are using XML to solve business problems.