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→Introduction
With XQuery Update you can modify the content of a xml database with a huge variety of functions. There are some hints you should know:
# A XQuery Update query can never return a result. So you can't combine reading queries and updating queries into one query, even if they are seperated separated with a comma.
# Updates of a XQuery Update query are not visible until the whole query is finished. So values generated by subqueries are not usable in the other parts of the query.
# The order of XQuery Update functions in a query is irrelevant. There is a [http://www.w3.org/TR/xquery-update-10/#id-upd-apply-updates specification] which regulates the order of execution of the update functions.
