安装程序正在载入安装元件。
假设正在载入的 blog 中已有一个项目，所以 XML DAS 将创建一个 blog 类型的 SDO 和一个 item 类型的 SDO。
Since we are assuming we are loading a blog with one item in it, the XML DAS will have created one SDO of type blog and one of type item.
问题在于，当你在站点上做一些较少的更改的时候，浏览器不认为它是一个重要的改变，因此它重新载入了你正在看的网页。
The problem comes when you make a small change to your site and the browser doesn't recognize it as a significant change, so it reloads the same page you just looked at.
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