Start Level 1 Node: Number AssignmentNumber AssignmentEnd Level 1 Node: Number Assignment
   Start Level 2 Node: Number Range AttributesNumber Range AttributesEnd Level 2 Node: Number Range Attributes
   Start Level 2 Node: Number Range IntervalsNumber Range IntervalsEnd Level 2 Node: Number Range Intervals
   Start Level 2 Node: Rules for Characteristics-Dependent Number AssignmentRules for Characteristics-Dependent Number AssignmentEnd Level 2 Node: Rules for Characteristics-Dependent Number Assignment