INSTANCE optional_xor_empty_aggregation#3;
extracted_from = {explicit_attribute#290};
corresponds_to = {correspondence#3};
attribute = explicit_attribute#290;
END_INSTANCE;
INSTANCE optional_xor_empty_aggregation#4;
extracted_from = {explicit_attribute#291};
corresponds_to = {correspondence#3};
attribute = explicit_attribute#291;
END_INSTANCE;