19. The computer system of claim 16 , wherein the data identifying entities comprises a first ordered array of tokens from the document and data, for each entity, defining boundaries of the entity in the first ordered array, wherein the data defining sentiment values assigned to tokens in the document comprises a second ordered array of sentiment values, and wherein the order of the sentiment values corresponds to the order of the tokens so as to associate the sentiment values with the tokens.
19. The computer system of claim 16 , wherein the data identifying entities comprises a first ordered array of tokens from the document and data, for each entity, defining boundaries of the entity in the first ordered array, wherein the data defining sentiment values assigned to tokens in the document comprises a second ordered array of sentiment values, and wherein the order of the sentiment values corresponds to the order of the tokens so as to associate the sentiment values with the tokens. 20. The computer system of claim 19 , wherein the sentiment value associated with an entity is a function of filtered sentiment values associated with the tokens within the boundaries of the entity.