SCHEMA example_1;

ENTITY first_entity;
	attr_1 : INTEGER;
END_ENTITY;

END_SCHEMA;

SCHEMA example_2;

USE FROM example_1;

ENTITY second_entity SUBTYPE OF (first_entity);
	attr_2 : STRING;	
END_ENTITY;

ENTITY third_entity SUBTYPE OF (first_entity);
	attr_c : second_entity;
END_ENTITY;

END_SCHEMA;