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* Since {{Version|8.0}}, the [[Options#MIXUPDATEMIXUPDATES|MIXUPDATEMIXUPDATES]] option is available. All updating constraints will be turned off, and nodes to be returned will be copied before they are modified by updating expressions. An error is raised if items are returned within a transform expression.
If you want to modify nodes in main memory, you can use the [[Update#transform|transform expression]].
