All products listed on Amazon's websites have been classified using a number of schemes such as product type (such as books, music, tools, apparel), brand, subject, genre, style, etc. This classification system is called browse. Each browse area (a unique classification area called a node) has been assigned an integer called a browse node ID.
Some products, such as parent ASINs, which have variations, do not return information in the BrowsesNodes response group.
The BrowseNodes response group provides a list of browse nodes to which the item belongs. For each browse node, this response group returns the browse node ID and name
Sample Response (REST)
<?xml version="1.0" encoding="UTF-8"?>
<ItemLookupResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2004-08-01">
<OperationRequest>
<HTTPHeaders>
<Header Name="UserAgent" Value="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"/>
</HTTPHeaders>
<RequestId>1NS8EGQQ81YRVBWQCE5Y</RequestId>
<Arguments>
<Argument Name="Service" Value="AWSECommerceService"/>
<Argument Name="AssociateTag" Value="[Your Associate ID Here]"/>
<Argument Name="SubscriptionId" Value="[Your Subscription ID Here]"/>
<Argument Name="ItemId" Value="B000002ADT"/>
<Argument Name="IdType" Value="ASIN"/>
<Argument Name="ResponseGroup" Value="BrowseNodes"/>
<Argument Name="Operation" Value="ItemLookup"/>
</Arguments>
</OperationRequest>
<Items>
<Request>
<IsValid>True</IsValid>
</Request>
<Item>
<ASIN>B000002ADT</ASIN>
<BrowseNodes>
<BrowseNode>
<BrowseNodeId>63926</BrowseNodeId>
<Name>General</Name>
<Ancestors>
<BrowseNode>
<BrowseNodeId>34</BrowseNodeId>
<Name>Jazz</Name>
<Ancestors>
<BrowseNode>
<BrowseNodeId>301668</BrowseNodeId>
<Name>Styles</Name>
</BrowseNode>
</Ancestors>
</BrowseNode>
</Ancestors>
</BrowseNode>
<BrowseNode>
<BrowseNodeId>598176</BrowseNodeId>
<Name>Hard Bop</Name>
<Ancestors>
<BrowseNode>
<BrowseNodeId>598174</BrowseNodeId>
<Name>Bebop</Name>
<Ancestors>
<BrowseNode>
<BrowseNodeId>34</BrowseNodeId>
<Name>Jazz</Name>
<Ancestors>
<BrowseNode>
<BrowseNodeId>301668</BrowseNodeId>
<Name>Styles</Name>
</BrowseNode>
</Ancestors>
</BrowseNode>
</Ancestors>
</BrowseNode>
</Ancestors>
</BrowseNode>
</BrowseNodes>
</Item>
</Items>
</ItemLookupResponse>
The Request that Generated the Response (REST)
http://webservices.amazon.com/onca/xml?Service=AWSECommerceService
&SubscriptionId=[Your Subscription ID Here]
&AssociateTag=[Your Associate ID Here]
&Operation=ItemLookup
&IdType=ASIN
&ItemId=B000002ADT
&ResponseGroup=BrowseNodes