Demand is a type of Activity. Consumption is a type of Demand. Drinking is a type of Consumption. Drinking is related to Straw. 
Vast is related to Space. Space is related to Inside. Inside is related to Door. 
Activity <--IsA-- Demand <--IsA-- Consumption <--IsA-- Drinking <--RelatedTo--> Straw 
Vast <--RelatedTo--> Space <--RelatedTo--> Inside <--RelatedTo--> Door 