Page is related to Letter. Letter is related to Item. Item is related to Detail. 
Direction is a type of Path. Path is related to Garden. Garden is related to Land. Land is related to Dirt. 
Page <--RelatedTo--> Letter <--RelatedTo--> Item <--RelatedTo--> Detail 
Direction --IsA--> Path <--RelatedTo--> Garden <--RelatedTo--> Land <--RelatedTo--> Dirt 