On the one prong, developers lay out the userinterface components in a markuplanguage (XML in Flex) that describes the various buttons, controls, and what-not involved in the application.
For some people, the crown jewel of Mozilla's XML capabilities is XML userinterfacelanguage (XUL), a markup language for describing cross-platform user interfaces.
对于有些人来说,Mozilla XML处理能力中皇冠上的珠宝是XML User Interface Language (XML用户接口语言,XUL),即一种用于描述跨平台用户接口的标记语言。