Creating a useful Flex application is as easy as opening your favorite text editor, typing some XML tags, saving the file, opening the file's URL in a web browser, and then repeating the process. When you develop a Flex application, you use the same iterative process that you use for other types of web application files, such as HTML, JSP, ASP, and CFML.
Unlike a set of static HTML pages or HTML templates created using JSP, ASP, or CFML, the files in a Flex application are compiled into a single binary SWF file. Another major difference between a Flex application and a JSP, ASP, or ColdFusion application is that application logic resides in the client-side SWF file. JSP, ASP, and ColdFusion are templating systems in which application processing occurs on the server and data is dynamically added to an HTML template and delivered to the client in an HTML page. For more information, see Moving to Flex from HTML and Moving to Flex from an HTML templating environment.
Because MXML files are ordinary XML files, you have a wide choice of development environments. You can develop in a simple text editor, a dedicated XML editor, or an integrated development environment (IDE) that supports text editing. Flex also provides tools for code debugging and performance profiling; for more information, see Using Flex development tools.
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