new one:
xmlns:mx="library://ns.adobe.com/flex/mx
not the old one:
xmlns:mx="library://ns.adobe.com/flex/halo
xmlns:mx="library://ns.adobe.com/flex/mx
xmlns:mx="library://ns.adobe.com/flex/halo
flash.system.Capabilities類中存放了與本地機器有關的信息,flash.system.Capabilities.languag