| The following typographical conventions are used in this book:
Italic Indicates new terms, URLs, email addresses, filenames, file extensions, pathnames, directories, and Unix utilities.
Constant width Indicates activities, commands, options, switches, variables, attributes, keys, functions, types, classes, namespaces, methods, modules, properties, parameters, values, objects, events, event handlers, XML tags, HTML tags, macros, the contents of files, or the output from commands.
Constant width bold
Shows commands or other text that should be typed literally by the user.
Constant width italic Shows text that should be replaced with user-supplied values.
NOTE This icon signifies a tip, suggestion, or general note.  | This icon indicates a warning or caution. |
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