How to describe restrictions of product?

[mihalt]

For example, I have products that have not just a few global regions included (like EU, Asia etc), but generally that has all regions indluded except any specific countries excluded (like global region except EU). So, should I probably have additional field excluded_regions and probably to custom model from Continent? Do you think that it is good idea?

Should I use this inheritance as swappable model then, right? Will all features of Continent be saved if I just add a few addtional fields?