16. The computer-implemented method of claim 15 , wherein assigning the primary category describing the item of interest from the first search index further comprises determining relevance values associated with at least one of the first attributes and associated first attribute values of respective first categories and the received item attributes and item attribute values.
16. The computer-implemented method of claim 15 , wherein assigning the primary category describing the item of interest from the first search index further comprises determining relevance values associated with at least one of the first attributes and associated first attribute values of respective first categories and the received item attributes and item attribute values. 17. The computer-implemented method of claim 16 , wherein assigning the primary category describing the item of interest from the first search index further comprises identifying a selected number of the first categories based on their relevance values as first category candidates.