在XSLT 1.0中，要么实现者必须支持扩展属性，要么用户必须进行外部(转换以后)处理，以保证增加或去掉了BOM。
In XSLT 1.0, either the implementer has to support an extension attribute or the user needs to apply an external (post transformation) process to ensure a BOM is added, or to strip it.
拿Facebook为例，它为每一个导航元素增加了“ref”属性来跟踪用户点击。
Sites such as Facebook, track user clicks by adding the "ref" parameter to each navigational element. Below is an example of how Facebook links their logo.
现有应用程序可以在无须更改代码的情况下，仅在manifest文件中增加一个属性，即可无缝变更为新的全息用户界面主题。
Existing applications can seamlessly participate in the new holographic UI theme without code changes, by adding a single attribute in their manifest files.
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