Variable data set in a PX Policy will persist to succeeding PX Policies of the same "type". If succeeding PX Policy(s) are only referencing the variable as a Data Element, than the integrity of the variable's data is not lost and will persist for the life-cycle of the task or event. However, if succeeding PX Policy(s) contain Action Rules/Actions that manipulate (set or clear) the same variable then the original set of data will be changed and/or lost. So in the case of PX Policy reiteration (or redo), the variable data will contain what was last written to the variable.
~Anthony P