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Preface
Constant width bold
Used to highlight portions of code, typically new additions to old code.
Constant width italic
Used in code examples and tables to show sample text to be replaced
with your own values.
Color
The second color is used to indicate a cross-reference within the text.
You should pay special attention to notes set apart from the text with the
following icons:
This is a tip, suggestion, or general note. It contains useful
supplementary information about the topic at hand.
This is a warning or note of caution, often indicating that
your money or your privacy might be at risk.
The thermometer icons, found next to each hack, indicate the relative com-
plexity of the hack:
Using Code Examples
This book is here to help you get your job done. In general, you can 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.
We appreciate, but do not require, attribution. ...