7. A computer readable storage medium having computer executable instructions recorded thereon which cause a computer system to carry out a method when executed, the method comprising: mapping a first set of concept nodes in a first taxonomy to a second set of concepts in a second taxonomy by aligning nodes with equivalent concepts in the first taxonomy and second taxonomy to generate a master taxonomy having a plurality of mapped concept nodes, the first set of concept nodes for organizing a first plurality of documents and the second set of concept nodes for organizing a second plurality of documents, each of the first and second plurality of documents associated with a document gloss, each of the mapped concept nodes containing documents from a concept node from the first taxonomy and a concept node from the second taxonomy that are determined to contain equivalent categories for documents; after mapping the first set of concept nodes to the second set of concept nodes, finding an expanded concept that is instantiated disproportionately in the document glosses of an unmapped node of the first taxonomy; determining if the expanded concept is instantiated in documents not classified at any leaf node in the second taxonomy; creating a new node with the expanded concept in the master taxonomy; and placing the documents from the unmapped node and documents associated with the expanded concept under the new node if the expanded concept from the second taxonomy not classified at any leaf node is instantiated in documents not classified at a leaf node in the second taxonomy.
7. A computer readable storage medium having computer executable instructions recorded thereon which cause a computer system to carry out a method when executed, the method comprising: mapping a first set of concept nodes in a first taxonomy to a second set of concepts in a second taxonomy by aligning nodes with equivalent concepts in the first taxonomy and second taxonomy to generate a master taxonomy having a plurality of mapped concept nodes, the first set of concept nodes for organizing a first plurality of documents and the second set of concept nodes for organizing a second plurality of documents, each of the first and second plurality of documents associated with a document gloss, each of the mapped concept nodes containing documents from a concept node from the first taxonomy and a concept node from the second taxonomy that are determined to contain equivalent categories for documents; after mapping the first set of concept nodes to the second set of concept nodes, finding an expanded concept that is instantiated disproportionately in the document glosses of an unmapped node of the first taxonomy; determining if the expanded concept is instantiated in documents not classified at any leaf node in the second taxonomy; creating a new node with the expanded concept in the master taxonomy; and placing the documents from the unmapped node and documents associated with the expanded concept under the new node if the expanded concept from the second taxonomy not classified at any leaf node is instantiated in documents not classified at a leaf node in the second taxonomy. 9. The non-transitory computer readable storage medium of claim 7 wherein the nodes are categories of the first and second plurality of documents.