Bookaml_ISBNModule encapsulating ISBNs. It makes sure that any given ISBN is correct, taking advantage of the check digit present in every ISBN. It supports both 10 and 13-digit ISBNs.
Bookaml_amazonModule providing facilities for finding information about books. It works by invoking the Amazon Product Advertising API, and therefore most of its functions require the associate tag, access key, and secret key available to registered users of Amazon Web Services.