IGDS_EXPAND_UNNAMED_CELLS (YES) AND IGDS_EXPAND_CELLS(YES): Neither of the cells is preserved. No donuts are formed. All elements of both cells are output as independent features.
IGDS_EXPAND_UNNAMED_CELLS (YES) AND IGDS_EXPAND_CELLS(NO): Only elements of the root unnamed cell are output. Nested cells are preserved and output as points.
IGDS_EXPAND_UNNAMED_CELLS (NO) AND IGDS_EXPAND_CELLS(YES): All elements of nested named cells are output. Donuts are formed. If both cells have donuts then an aggregate of donuts is formed.
IGDS_EXPAND_UNNAMED_CELLS (NO) AND IGDS_EXPAND_CELLS(NO): The insertion point of the root unnamed cell is preserved. Donuts are formed from the root cell only. The nested cell is ignored and so are its members.