Michael Rys (PM for the SQL Server Engine support of XQuery) is trying to bring some order into the confusion around XQuery 1.0 and XPath 2.0 type system. His first instalment in the series introduces the terminology and general concepts. Read it here. More to come, worth to stay tuned.
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Here is another piece of a must reading - "Chapter 9 - Improving XML Performance" of the "Improving .NET Application Performance and Scalability" guide from the Microsoft Pattern and Practices group. Here are the objectives : Optimize XML processing design, Parse XML documents efficiently, Validate XML documents efficiently, Optimize your
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