1. A method comprising: accessing product category information identifying various products in a particular product category in the inventory of a marketplace website, the product category information further identifying a set of attributes associated with the products in the particular product category; calculating, using one or more processors, an importance value associated with each of the attributes, the importance values indicating an importance of each of the attributes for uniquely identifying the products in the product category; and ranking the attributes, based on the importance value associated with each of the attributes.