为此，4gl通常提供图形编辑器来支持以可视方式设计GUI，并提供专有脚本语言和API来将用户驱动的事件绑定到特定业务逻辑。

To facilitate this, 4gls typically provide graphical editors to visually design the GUI and proprietary scripting languages and APIs to tie user-driven events to specific business logic.

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它包含一个基于Ajax的、事件驱动的引擎，一组丰富的XHTML和XUL元素，一种名为ZUML的标记语言，这种语言用于创建特性丰富的用户界面。

It is composed of an Ajax-based, event-driven engine, a rich set of XHTML and XUL components, and a mark-up language called ZUML, which is used for creating feature-rich user interfaces.

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ZK框架拥有丰富的组件、一种标记语言、强大的开发工具和详细的文档，而且它是一个以事件驱动的开源ajax框架。

The ZK framework has a rich set of components, a mark-up language, powerful development tools, and great documentation, along with being open source and an event-driven Ajax framework.

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