Product Advertising API
Developer Guide (API Version 2013-08-01)

NarrowBy Attribute

The basis on which returned items are split into bins is specified by the NarrowBy attribute in the SearchBinSet element. In the following example, the NarrowBy attribute shows that the bins are based on price range.

<SearchBinSet NarrowBy="PriceRange">

For another product category, the NarrowBy attribute might be different, for example:

<SearchBinSet NarrowBy="BrandName">

You cannot specify NarrowBy values nor can you specify the values they encompass. When the SearchBins response group is included in a request, ItemSearch automatically divides the ItemSearch results into bins.