This diagram shows a hierarchy of a form service request structure. From the top:

The top of the diagram has two boxes side-by-side representing the FormRequest and FSREvent. Each box has arrows pointing down to the next layer of items, which include boxes for FIStructure, Query, and FormAction:

The boxes for Query and FormAction in the second layer have arrows pointing down to the next layer of items, which include Condition and GridAction:

The boxes for Condition and GridAction have arrows pointing down to the next layer of items, which include GridRowInsertEvent and GridRowUpdateEvent:

The boxes for GridRowInsertEvent and GridRowUpdateEvent have arrows pointing down to the item in last layer, which is labeled GridColumnEvent: