Structure of EXTERNAL versionable object

EXTERNAL

 -DATAFLOWS                                        (via EXTERNAL_SOURCE_REFERENCE)
   -DATAFLOW_ATTRIBUTE_USAGES                      (via DATAFLOW_REFERENCE)
   -DATAFLOW_DATA_ITEM_USAGES                      (via DATAFLOW_REFERENCE)

Also included in this versionable object are:

- Any user defined EXTENDED_STRUCTURE_ELEMENTS owned by the above