Using XQuery to Manage XML with SQL Server 2005
http://www.informit.com/articles/article.aspx?p=468058
XQuery 1.0: An XML Query Language
http://www.w3.org/TR/xquery/
XML Support in Microsoft SQL Server 2005
http://msdn2.microsoft.com/en-us/library/ms345117.aspx
Performance Optimizations for the XML Data Type in SQL Server 2005
http://technet.microsoft.com/en-us/library/ms345118.aspx
