Response container for aspect histograms. Aspect histograms are returned for categories that have been mapped to domains only. In most cases, just leaf categories are mapped to domains, but there are exceptions.

Response container for category histograms. Only returned when one or more category histograms are returned. A category histogram is not returned if there are no matching items or if the search is restricted to a single leaf category.

Note: The category IDs returned for items in search results are for the leaf categories in which the items are listed. If you use these category IDs as input, the response will not return a category histogram.

Note: When searching the eBay Motors site, category histograms may not be available for some parent categories. In these cases, aspect histograms should be used to refine search results. This behavior is consistent with eBay Motors site search behavior.

Response container for condition histograms. These can be returned for any category (parent or leaf).

Not returned when Condition is specified in itemFilter. That is, only returned when you have not yet narrowed your search based on specific conditions.

Only returned when you search the eBay US site (as of February 2011). International items in US search results are included in the histogram counts.