// SCG level interfaces (valid,quality)

DomainInterface{{
// is Solution s valid for Instance i?
public boolean valid(Instance i, Solution s);

// what is the quality of Solution s for Instance i?
public double quality(Instance i, Solution s);
}}

Domain {{
public boolean valid(Instance i, Solution s) {
  return true;}
public double quality(Instance i, Solution s) {
  return 1.0;};
}}