10. A knowledge structure as claimed in claim 9 , wherein at least one of the elements is a word.
14. A knowledge structure as claimed in claim 10 , wherein at least one of the element file includes a sixth link information file including at least one attribute of the word of the element file, wherein at least one of the element file includes a seventh link information file including at least one word or phrase that the word or phrase of the element file is the attribute of.