Big is related to Sun. Sun is related to Object. Object is part of Sentence. Sentence is a type of Declare. 
Wall is part of Cave. Wall is part of Hallway. Hallway is related to Aisle. 
Big <--RelatedTo--> Sun <--RelatedTo--> Object --PartOf--> Sentence --IsA--> Declare 
Cave <--PartOf-- Wall --PartOf--> Hallway <--RelatedTo--> Aisle 