The following typographical conventions are used in this book:
Constant width
Used to indicate code examples, code references in text (including tags, elements, variables, and so forth), and keyboard commands.
Constant width italic
Used to indicate replaceable text in code.
Constant width bold
Used to highlight the code that is being discussed.
Italic
Used to indicate filenames, directory names, URLs, and glossary terms.
This icon designates a tip, suggestion, or a general note that is an important aside to its nearby text.
This icon designates a warning relating to the nearby text.