Diplomat is a type of Worker. Assistant is a type of Worker. Aide is a type of Assistant. Aide is related to Servant. 
Owner is related to Stuff. you are likely to find Stuff in/at/on Table. you are likely to find Cup in/at/on Table. Cup can be used for Drinking. 
Diplomat --IsA--> Worker <--IsA-- Assistant <--IsA-- Aide <--RelatedTo--> Servant 
Owner <--RelatedTo--> Stuff --AtLocation--> Table <--AtLocation-- Cup --UsedFor--> Drinking 