9. The system of claim 8 , wherein the item categorization service is further adapted to assign the first category for the item of interest by selecting a deepest common ancestor of the first category candidates, wherein the deepest common ancestor comprises the first category candidate that is a common ancestor to more of the first category candidates than any other first category candidates.
8. The system of claim 7 , wherein the item categorization service is further adapted to assign the first category for the item of interest by identifying the hierarchically organized categories having the highest relevance values as first category candidates.