In MXML, you use tags to declare an application's user interface. You also use tags to declare an application's data management tier, which represents connections to data sources, data requests and responses, data storage, binding of data between the user interface and data sources, data validation, and data formatting. Using just tags, you get a great deal of built-in code execution that ties the user interface to the data management tier. You can also write ActionScript code that executes at runtime based on user interaction or system events.
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