The Subjects response group returns a book’s Subject description, which characterizes the book’s content. Both ItemSearch and ItemLookup can use this response group.
Sample Response Snippet (REST)
<Subjects>
<Subject>Computer Bks - Languages / Programming</Subject>
<Subject>Computer Books: General</Subject>
<Subject>Computer Networks</Subject>
<Subject>Computer Programming Languages</Subject>
<Subject>Computers</Subject>
<Subject>HTML (Document markup language)</Subject>
<Subject>Hypertext systems</Subject>
<Subject>Internet - Web Site Design</Subject>
<Subject>Networking - General</Subject>
<Subject>Programming Languages - HTML</Subject>
<Subject>World Wide Web</Subject>
<Subject>Computers / Programming Languages / HTML, SGML, VRML, XML</Subject>
</Subjects>
The Request that Generated the Response (REST)
http://webservices.amazon.com/onca/xml?Service=AWSECommerceService
&AWSAccessKeyId=[Your Access Key ID Here]
&AssociateTag=[Your Associate ID Here]
&Operation=ItemSearch
&ItemId=0239409223
&ResponseGroup=Subjects