Necessity is related to Voice. you are likely to find Voice in/at/on Radio. 
Copy is a type of Representation. Representation is related to District. District is related to Suburb. you are likely to find Mall in/at/on Suburb. 
Necessity <--RelatedTo--> Voice --AtLocation--> Radio 
Copy --IsA--> Representation <--RelatedTo--> District <--RelatedTo--> Suburb <--AtLocation-- Mall 