Chapter 3

Ontologies and Semantics


Order and simplification are the first steps toward the mastery of a subject.

Thomas Mann


Information has limited value unless it can take its place within our general understanding of the world. When a financial analyst learns that the price of a stock has suddenly dropped, he cannot help but wonder if the drop of a single stock reflects conditions in other stocks in the same industry. If so, the analyst may check to ensure that other industries are following a downward trend. ...

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