Changes

Some more BaseX-specific [[Database Module#Updates|updating database functions]] exist to add, delete or update documents in a database.

There are a few specialties around XQuery Update that you should know about. In addition to the '''simple expression''', the XQUF adds the '''updating expression''' as a new type of expression. An updating expression returns only a Pending Update List (PUL) as a result which is subsequently applied to addressed databases and DOM nodes. A simple expression cannot perform any permanent changes and returns an empty or non-empty sequence.