虽然HTML和core标记引用了Sun名称空间，使用了myfaces库，但实际上是由Apache实现的。

Although the HTML and core tags reference a Sun namespace, the MyFaces libraries are used, so these are actually implemented by Apache.

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引用标记库。

Reference the tag library.

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该对象还包含对在文档中显示图像的HTML标记的引用，以及移动图像、设置透明度等的helper方法。

It also has a reference to the HTML tag that displays the image in the document as well as handy helper methods to move the image, set its opacity, and so on.

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