<p>The XQUF offers five new expressions to modify data. While insert, delete, rename and replace basically explain themselves, the transform expression is different. Modified nodes are copied in advance and the original databases remain untouched. </p>
===fnFn:put() Function===<p>FN:put() as also part of the XQUF function and enables the user to serialize XDM instances to secondary storage. It is executed at the end of a snapshot. Serialized documents therefore reflect all changes made effective during a query.</p>
==Fragments==