9. The method of claim 8 , wherein the step of using a density function to evaluate the received concepts more specifically comprises identifying an affinity score for each of the concepts which measure how closely the concept match the query, and determining a density score for each of the concepts, wherein the density score relates affinity scores for children concepts located underneath one of the concepts to the number of children concepts beneath said one of the concepts.
9. The method of claim 8 , wherein the step of using a density function to evaluate the received concepts more specifically comprises identifying an affinity score for each of the concepts which measure how closely the concept match the query, and determining a density score for each of the concepts, wherein the density score relates affinity scores for children concepts located underneath one of the concepts to the number of children concepts beneath said one of the concepts. 10. The method of claim 9 , wherein the method more specifically comprises relating a summation of affinity scores for children concepts underneath said one of the concepts to a number of children concepts underneath said one of the concepts.