Middle is related to Location. Point is a type of Location. Point is related to Reason. Reason is a synonym of Purpose. 
Cold is related to Fish. you are likely to find Fish in/at/on Bridge. Bridge is related to Upper. 
Middle <--RelatedTo--> Location <--IsA-- Point <--RelatedTo--> Reason <--Synonym--> Purpose 
Cold <--RelatedTo--> Fish --AtLocation--> Bridge <--RelatedTo--> Upper 