1. A method for processing informational items originating from a plurality of information sources into a derived document for topical analysis thereof, comprising: collating informational items from a one of the sources in accordance with a predetermined plurality of relevant attributes, and a key property value common to selected ones of the relevant attributes; grouping all informational items from the plurality of sources associated with the key common property value to form a document, wherein the informational items therein are marked by the informational source thereof; and, analyzing the document for topical identification.