Search results can return with items listed under multiple browse nodes. Some nodes, however, are more relevant that others. The IsCategoryRoot response tag identifies which browse node is the most relevant for an item in a specific marketplace. This functionality helps vendors classify items for sale.
IsCategoryRoot
The element applies to the marketplace specified in the request. So, it is possible for the IsCategoryRoot value to be different across marketplaces.
The IsCategoryRoot value is not useful in the Books search index.
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