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 a category histogram. This container is returned only when the specified category has children categories.

Note: The category IDs returned for items in search results are for the leaf categories in which the items are listed. If you use a leaf category ID 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. Condition histograms are returned for any category (leaf or parent).

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.