MXML
MXML is an XML-based markup language used to declare user interfaces in the early Flex framework, originally developed by Macromedia and later maintained by Adobe and, since the late 2000s, by Apache Flex. It is designed to work with ActionScript and the Flash runtime, allowing developers to describe the structure and behavior of a UI as declarative XML rather than purely imperative code.
MXML files, with the .mxml extension, are compiled by the Flex compiler into ActionScript and then into
Key features include data binding using expressions in braces, fx:Script blocks for ActionScript code, states and
Today, MXML’s prominence has diminished with the decline of the Flash platform, though the Apache Flex project