8. The method of claim 7 , further comprising, if there is not another class connected to the first or second class in the first or second join schedule, connecting the first or second instance to the instances extracted from the first or second class depending on their relationship and generating at least one first or second instance path.
7. The method of claim 1 , wherein step (d-3) comprises: if the first or second instance is connected to at least one class in the first or second join schedule, extracting at least one instance connected to the first or second instance from instances of a first or second class directly connected to the first or second instance; if there is another class connected to the first or second class in the first or second join schedule, extracting at least one instance connected to each of the extracted instances from instances of the connected class; and connecting the first or second instance to the extracted instances depending on their relationship and generating at least one first or second instance path.