7. A system for characterizing a document, the system comprising: one or more processors; and one or more memories operatively coupled to at least one of the one or more processors and having instructions stored thereon that, when executed by at least one of the one or more processors, cause at least one of the one or more processors to: generate one or more sets of taxonomic nouns corresponding to a document, wherein the one or more sets of taxonomic nouns comprise one or more of: a set of first taxonomic nouns based upon classification information generated by an author of the document; a set of second taxonomic nouns based upon one or more user-generated tags characterizing at least a portion of the document; a set of third taxonomic nouns based upon one or more search terms utilized to access the document; or a set of fourth taxonomic nouns based upon the attributes related to a method of access of the document; generate a set of fifth taxonomic nouns by processing the document based upon one or more pattern rules and a dictionary of known terms, wherein the one or more pattern rules specify a method of extracting terms from the document; and aggregate at least one of the one or more sets of taxonomic nouns with the set of fifth taxonomic nouns into a composite set of taxonomic nouns; and characterize the document based on the composite set of taxonomic nouns.
7. A system for characterizing a document, the system comprising: one or more processors; and one or more memories operatively coupled to at least one of the one or more processors and having instructions stored thereon that, when executed by at least one of the one or more processors, cause at least one of the one or more processors to: generate one or more sets of taxonomic nouns corresponding to a document, wherein the one or more sets of taxonomic nouns comprise one or more of: a set of first taxonomic nouns based upon classification information generated by an author of the document; a set of second taxonomic nouns based upon one or more user-generated tags characterizing at least a portion of the document; a set of third taxonomic nouns based upon one or more search terms utilized to access the document; or a set of fourth taxonomic nouns based upon the attributes related to a method of access of the document; generate a set of fifth taxonomic nouns by processing the document based upon one or more pattern rules and a dictionary of known terms, wherein the one or more pattern rules specify a method of extracting terms from the document; and aggregate at least one of the one or more sets of taxonomic nouns with the set of fifth taxonomic nouns into a composite set of taxonomic nouns; and characterize the document based on the composite set of taxonomic nouns. 11. The system of claim 7 , wherein the instructions that, when executed by at least one of the one or more processors, cause at least one of the one or more processors to generate a set of fifth taxonomic nouns by processing the document based upon one or more pattern rules and a dictionary of known terms further cause at least one of the one or more processors to: apply the one or more pattern rules to free form text of the document to extract one or more terms; compare the one or more terms to the dictionary of known terms to identify matching terms; and assign the matching terms to the set of fifth taxonomic nouns.