Document is related to Book. you are likely to find Book in/at/on Bag. you are likely to find Body in/at/on Bag. Vote is a type of Body. 
Electrical is related to Power. Power is related to Electric. Electric is related to Lightning. Lightning is related to Electricity. 
Document <--RelatedTo--> Book --AtLocation--> Bag <--AtLocation-- Body <--IsA-- Vote 
Electrical <--RelatedTo--> Power <--RelatedTo--> Electric <--RelatedTo--> Lightning <--RelatedTo--> Electricity 