Recommendations based on the syntactic properties of the items and customer interests in those properties use attribute-based recommendation technologies. Though the simplest attribute-based recommendation is raw retrieval, true "recommenders" that use attributes model customer interests beyond a simple query. For example, a customer who is browsing in the "country music" section of a music store and who has several "$9.99 special" compact disks in her shopping cart might receive recommendations for discount country CDs. Other attribute-based recommenders use customer profiles that indicate likes or dislikes to make recommendations to the customer. For example, the same music store may learn that a particular customer only buys discounted CDs or that another customer never buys music from the 1970s