Learning is performed on the basis of many short and easy to follow workshops of progressive difficulty where each line code is explained, dissected.
Annexes (called resources associated technologies) allow to see (find?) The foundation for Ajax, ultimately, is that the combination of different technologies, so it is not obvious to everyone master the basics of XHTML, CSS, XML, JavaScript, DOM, PHP and MySQL. These reminders in one book are welcome.
To summarize: very good book to get started without apprehension in AJAX!
