@type policy_type() ::
  :sod | :bod | :sla | :mandatory | :forbidden | :cardinality | :custom

@type t() :: %Ex4pmCore.ProcessIR.Policy{
  description: String.t(),
  id: String.t(),
  metadata: map(),
  rules: map(),
  target_activities: [String.t()],
  target_objects: [String.t()],
  type: policy_type()
}