2. The system of claim 1 , wherein the metadata research module includes a learning machine for processing a set of feature vectors including one or more features from the group consisting of: a feature based on text similarity; a feature based on number of shared legal classification codes; and a feature based on number of shared legal citations.
2. The system of claim 1 , wherein the metadata research module includes a learning machine for processing a set of feature vectors including one or more features from the group consisting of: a feature based on text similarity; a feature based on number of shared legal classification codes; and a feature based on number of shared legal citations. 6. The system of claim 2 , wherein the feature based on text similarity includes one or more from the group consisting of TFIDFScore, RPWeightedScore, and NumSharedRPDocs.