messages to our little group. Submissions have ranged from pointing out small typos
to deep technical discussions. Feedback on our original first chapter led us to a complete
rewrite in order to make sure the points we wanted to get across did, indeed, get across.
This system allowed us to clearly formulate what we wanted to say in a way that worked
for you, our readers.
Overall, the book has become so much better because of the help of hundreds of vol-
unteers who took the time to send in their suggestions. We understand the immense
value this model has, and we want to keep it up. New features in CouchDB should
make it into the book without us necessarily having to do a reprint every thee months.
The publishing industry is not ready for that yet, but we want to continue to release
new and revised content and listen closely to the feedback. The specifics of how we’ll
do this are still in flux, but we’ll be posting the information to the book’s website the
first moment we know it. That’s a promise! So make sure to visit the book’s website at
http://books.couchdb.org/relax to keep up-to-date.
Before we let you dive into the book, we want to make sure you’re well prepared.
CouchDB is written in Erlang, but you don’t need to know anything about Erlang to
use CouchDB. CouchDB also heavily relies on web technologies like HTTP and Java-
Script, and some experience with those does help when following the examples
throughout the book. If you have built a website before—simple or complex—you
should be ready to go.
If you are an experienced developer or systems architect, the introduction to CouchDB
should be comforting, as you already know everything involved—all you need to learn
are the ways CouchDB puts them together. Toward the end of the book, we ramp up
the experience level to help you get as comfortable building large-scale CouchDB sys-
tems as you are with personal projects.
If you are a beginning web developer, don’t worry—by the time you get to the later
parts of the book, you should be able to follow along with the harder stuff.
Now, sit back, relax, and enjoy the ride through the wonderful world of CouchDB.
Using Code Examples
This book is here to help you get your job done. In general, you may use the code in
this book in your programs and documentation. You do not need to contact us for
permission unless you’re reproducing a significant portion of the code. For example,
writing a program that uses several chunks of code from this book does not require
permission. Selling or distributing a CD-ROM of examples from O’Reilly books does
require permission. Answering a question by citing this book and quoting example
code does not require permission. Incorporating a significant amount of example code
from this book into your product’s documentation does require permission.
xviii | Preface
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