Conventions Used in This Book

• Garamond Book is used for element and attribute names.

• Constant Willison is used for program examples, attribute value literals, start- and end-tags, and source code example text.

• Constant Willison Oblique is used for “replaceable” text or variables. Replaceable text is text that describes something you're supposed to type, like a filename, in which the word “filename” is a placeholder for the actual filename.

• Garamond Italic is used for filenames and (in the print version of the book) URLs.

• URLs are presented in parentheses after the name of the resource they describe in the print version of the book.