XML - Pro SQL Server Internals - page 224

Figure 11-12. Drill-down approach: Execution plans
modify() Method
Finally, the modify() method allows you to modify XML data by using the XML Data Modification language
(XML DML) . I am not going to cover the DML XML syntax in depth. You can find detailed information about XML
DML in Books Online at: http://msdn.microsoft.com/en-us/library/ms177454.aspx .
All of the XQuery/XPath performance considerations discussed previously apply here as well.