4. The computer-implemented method of claim 3 , wherein: the inferring of the second attribute value is further based on the first attribute value.
3. The computer-implemented method of claim 1 , wherein: the item description is textual and comprises an item title and an item summary; the attribute is a first attribute, and the attribute value is a first attribute value; and the inferring of the first attribute and first attribute value is based on the item summary; the method further comprising: inferring a second attribute and a second attribute value based on the item title.