Max Vernon takes us through the .modify function:
Determining the property syntax when modifying XML values in SQL Server can be time consuming if you don’t work with XML regularly. SQL Server includes a very flexible XML subsystem, called XML_DML, or XML Data Manipulation Language. XML_DML can be used to easily and effectively update XML values in an xml-typed column or variable. This question on dba.stackexchange.comasked about using the
.modifyfunction to change the value of an element, which in turn prompted this post.
Read on for a number of examples.