26. The system of claim 25 , wherein the model refinement system is further configured to select, for each selected intermediate split-rule, an additional clause to include in the selected intermediate split-rule, the additional clause specifying an additional match score for an attribute and adjust the selected intermediate split-rules based, at least in part, on the additional clause.
26. The system of claim 25 , wherein the model refinement system is further configured to select, for each selected intermediate split-rule, an additional clause to include in the selected intermediate split-rule, the additional clause specifying an additional match score for an attribute and adjust the selected intermediate split-rules based, at least in part, on the additional clause. 27. The system of claim 26 , wherein the model refinement system is further configured to select the additional clause for an attribute having a highest attribute weight based on an error rate associated with the attribute and a coverage measure for the attribute.