9. The method as recited in claim 8 , wherein the weight associated with one of the at least one of the individual logical parts is different from a weight assigned to another of the at least one of the individual logical parts.
9. The method as recited in claim 8 , wherein the weight associated with one of the at least one of the individual logical parts is different from a weight assigned to another of the at least one of the individual logical parts. 11. The method as recited in claim 9 , wherein if the product identifier comprises multiple logical parts separated by a punctuation mark, the context information further comprising at least some of the logical parts as a single consecutive character string without punctuation.