19. The apparatus of claim 16 , wherein the operations further comprise: determining a third ranked list of item types based on the item record using a plurality of attribute-based classifiers.
19. The apparatus of claim 16 , wherein the operations further comprise: determining a third ranked list of item types based on the item record using a plurality of attribute-based classifiers. 20. The apparatus of claim 19 , wherein the aggregating of the first ranked list of item types and the second ranked list of item types into the combined ranked list of item types comprises: aggregating the first ranked list of item types, the second ranked list of item types, and the third ranked list of item types into the combined ranked list of item types.