A method and system for retrieving and normalizing product information are described. The system retrieves product information from sources that are accessed over a network. Next, the system creates markup language based on the product information. The markup language includes a first attribute-value pair that includes a first attribute and a first value. Next, the system normalizes the markup language by translating the first attribute to a second attribute responsive to an identification of the first attribute in a list that includes a plurality of attributes that are associated with a first product and the second attribute. The second attribute is a canonical representation of the plurality of attributes respectively.