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Policy Xpress is able to use variables. Variables are shared across all policies that run at the same time, so a variable that has been set can be used by other policies of lower priority.
For example, a variable can contain a value calculated once by one policy, and then shared across other policies that no longer need to recalculate the value. A variable can also be a trigger for other policies, where the policies only run if the policy before them has run.
Variables are set with actions and saved as data elements. They are available in the Variables category of both actions and data elements.