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ENTITY rule_schema;
  name                    : STRING; 
  constants               : SET OF user_constant; 
  types                   : SET OF rule_schema_defined_type; 
  entities                : SET OF rule_schema_entity; 
  functions               : SET OF rule_schema_function; 
  procedures              : SET OF rule_schema_procedure; 
  rules                   : SET OF rule_schema_rule; 
  uniqueness_rules        : SET OF rule_schema_uniqueness_rule; 
  used_built_in_functions : OPTIONAL SET OF INTEGER; 
  instances               : SET OF entity_instance; 
  schema_instance         : schema_instance; 
  global_variables        : OPTIONAL algorithm_head; 
  line_number             : INTEGER; 
  first_line              : INTEGER; 
  last_line               : INTEGER; 
END_ENTITY;