Flex includes a standard set of ActionScript classes and packages that define the Flex components and provide helper classes. These packages are in the Flex application WAR file under flex_app_root/WEB-INF/flex/system_classes. These packages are available to all Flex applications and do not require explicit import statements.
In addition, Flex includes a SWC file in the flex_app_root/WEB-INF/flex/frameworks directory that provides all the necessary symbols for Flex components. A debug version of this SWC file is located in the flex_app_root/WEB-INF/flex/frameworks_debug directory.
Version 1.5
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