The following typographical conventions are used in this book:
Indicates new terms, URLs, email addresses, filenames, and file extensions
Constant width
Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords
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 or by values determined by context
This icon signifies a tip, suggestion, or general note
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