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#; Pending Update List:The most important thing to keep in mind when using XQuery Update is the Pending Update List (PUL). In contrast to other programming languages, XQUF statements are not executed immediately, but are first collected within a set-like structure, the PUL. At the end of a query, all update primitives on this list are applied after being checked for compatibility. If a conflict exists, an error message is returned and all accessed databases remain untouched (atomicity).</p>
→XQUF Concepts
There are a few specialties around XQuery Update that you should know about.
==New Expressions==
