Cocoa's New Tree-Based XML Parser

摘要

This is the first part of a (two-part) article showing how to use a few of the great new pieces of Cocoa functionality available to developers with the release of Tiger. The first—the focus of this article—is NSXML, a set of Cocoa classes that implement a robust tree-based XML parser that provides the ability to create and edit XML from scratch as well as from data contained in files and vended through web services. The second new technology, which we'll concentrate on in the next installment, is Core Data, one of the most astoundingly wonderful bits of technology Apple has ever given to the Mac development community. In this month's article, we'll build a small Cocoa application that will retrieve book information from Amazon's XML-based web service, parse the vended data into Cocoa objects, then let the user edit the data before saving it to an XML file on their local disk.