8. A computer usable program product comprising one or more computer-readable storage devices, and program instructions stored on at least one of the one or more storage devices, the stored program instructions comprising: program instructions to aggregate, from a set of points extracted from a large document, a set of core points, a point and a core point each being a topic covered in the document; program instructions to construct, for the core point in the set of core points, a network of associations, wherein an association in the network comprises an entity that has a relationship with the core point by virtue of having contributed data in the document that relates to the core point; program instructions to compute, from the contributed data a sentiment value of the contributed data, the sentiment value being indicative of a sentiment of the entity towards the core point; program instructions to analyze a data stream from a data source other than the document to isolate a portion of data stream that relates to the core point; program instructions to identify a second entity in the portion of the data stream, wherein the second entity contributes the portion of the data stream that relates to the core point; program instructions to compute, from the portion of the data stream that relates to the core point, a second sentiment value of the second entity towards the core point; program instructions to determine that the second entity does not exist in the network of associations; program instructions to add, responsive to determining that the second entity does not exist in the network of associations, the second entity and the second sentiment value to the network of associations; program instructions to compute from a set of sentiment values corresponding to the associations in the network of associations, an overall sentiment value for the core point; and program instructions to report overall sentiment values for each core point in the document.
8. A computer usable program product comprising one or more computer-readable storage devices, and program instructions stored on at least one of the one or more storage devices, the stored program instructions comprising: program instructions to aggregate, from a set of points extracted from a large document, a set of core points, a point and a core point each being a topic covered in the document; program instructions to construct, for the core point in the set of core points, a network of associations, wherein an association in the network comprises an entity that has a relationship with the core point by virtue of having contributed data in the document that relates to the core point; program instructions to compute, from the contributed data a sentiment value of the contributed data, the sentiment value being indicative of a sentiment of the entity towards the core point; program instructions to analyze a data stream from a data source other than the document to isolate a portion of data stream that relates to the core point; program instructions to identify a second entity in the portion of the data stream, wherein the second entity contributes the portion of the data stream that relates to the core point; program instructions to compute, from the portion of the data stream that relates to the core point, a second sentiment value of the second entity towards the core point; program instructions to determine that the second entity does not exist in the network of associations; program instructions to add, responsive to determining that the second entity does not exist in the network of associations, the second entity and the second sentiment value to the network of associations; program instructions to compute from a set of sentiment values corresponding to the associations in the network of associations, an overall sentiment value for the core point; and program instructions to report overall sentiment values for each core point in the document. 15. The computer usable program product of claim 8 , wherein the computer usable code is stored in a computer readable storage device in a data processing system, and wherein the computer usable code is transferred over a network from a remote data processing system.