但是，因为它并未实际运行在一个真正的应用服务器中，所以preview选项卡将不会显示您最终J sp元素的样子。
The Preview TAB won't show you what the final JSP elements will look like, however, because it's not actually running in a real application server.
XML允许您访问这些设计元素和文档，可以将它想像成合为一体的应用服务器、Web服务器和数据库引擎。
XML lets you access those design elements and documents. Think of it as your application server, Web server, and database engine rolled into one.
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