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Images are returned by two response groups:
Images
VariationImages
These response groups are also included in the Medium and Large response groups.
The Images response group can be used with the following Amazon Associates Web Service operations:
ItemLookup
ItemSearch
ListLookup
SimilarityLookup
The Images response group does not return images of child items; it only returns an image of the parent item, if there is one. To return the images of the child items, use the VariationImages response group, which can only be used with the ItemLookup operation.
Conversely, VariationImages only returns images of child items. If you use this response group with items that are not child items, ItemLookup does not return any images.
Some items do not have images or have images that are missing, for example, the large size of an image might be missing. If an item does not have an associated image, either the image is missing or the item is a parent item. Often parent items do not have associated images because they are abstractions of all of the child items. Amazon Associates Web Service sometimes returns the image of a child item for a parent item so that something can be displayed.
If the item in the request, such as a parent item, does not have images associated with it, the ImageSet and ImageSets elements are not included in the response
