Interest is a type of Share. Interest is related to Stuff. Stuff is related to Production. Production is related to Activity. 
Continent is related to South. you are likely to find Cotton in/at/on South. Cotton is related to Pillow. 
Share <--IsA-- Interest <--RelatedTo--> Stuff <--RelatedTo--> Production <--RelatedTo--> Activity 
Continent <--RelatedTo--> South <--AtLocation-- Cotton <--RelatedTo--> Pillow 