4. The system of claim 3 , wherein at least one of the model stacks includes a vector space model as the classification model thereof and a family of Bayesian generalized linear models as the confidence model thereof, the family of Bayesian generalized linear models being configured to assign confidence levels to classification results output from the vector space model.
4. The system of claim 3 , wherein at least one of the model stacks includes a vector space model as the classification model thereof and a family of Bayesian generalized linear models as the confidence model thereof, the family of Bayesian generalized linear models being configured to assign confidence levels to classification results output from the vector space model. 5. The system of claim 4 , wherein the classification results are structured to comport with at least one predefined taxonomy.