This book is a vademecum for the iText developers who wants to know more about PDF as a document format.
In the past, I used to refer to ISO-32000 whenever somebody asked me questions such as "why can't I use PDF as a format for editing documents" or whenever somebody wanted to use a feature that wasn't supported out-of-the-box.
I soon realized that answering "read the specs" is lethal when the specs consist of more than a thousand pages. In this iText tutorial, I'd like to present a short introduction to the syntax of the Portable Document Format. It's not the definitive guide, but it should be sufficient to help you out when facing a PDF-related problem.
You'll find some simple iText examples in this book, but the heavy lifting will be done in the other iText books.