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First, some examples for update expressions are given.
Note: in most cases, as last and after will be evaluated faster than as first and before!
All descendants of /n are deleted and the given text is inserted as the only child.
But there are two ways out: If you want to modify nodes in main memory, you can use the transform expression.
In Base X, all updates are performed on database nodes or in main memory.
By default, it is not possible to mix different types of expressions in a query result.