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If no parameter is given, all of the process variables in the main process will be rewrittenoverwritten.
By specifying includedVariables, specific variables that should be rewritten overwritten can be defined.
By specifying excludedVariables, specific variables that should NOT be rewritten overwritten in the main process can be defined. All other variables, which are not defined, will be rewrittenoverwritten.
The ActionHandler is usually built-in on the last activity in the sub-process, but it may be used in the normal course of the sub-process (i.e. to write preliminary results in the main process).
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