Net is a type of Fabric. Net is related to World. World is a type of Island. Island is a type of Book. 
Mess is related to Apple. Apple is related to Trouble. Noise is a type of Trouble. Noise can be used for Warning. 
Fabric <--IsA-- Net <--RelatedTo--> World --IsA--> Island --IsA--> Book 
Mess <--RelatedTo--> Apple <--RelatedTo--> Trouble <--IsA-- Noise --UsedFor--> Warning 