10. The method of claim 1 , wherein the one or more terms are selected further based on the frequency of the one or more terms in the first chronological segment or in the document, or the frequency of the one or more terms in other documents, or a combination thereof.
10. The method of claim 1 , wherein the one or more terms are selected further based on the frequency of the one or more terms in the first chronological segment or in the document, or the frequency of the one or more terms in other documents, or a combination thereof. 11. The method of claim 10 , wherein the one or more terms are selected further based on the difference between the frequency of the one or more terms in the first chronological segment and the frequency of the one or more terms in other documents.