An extract transform is a bit different than its parameter mapping counterpart because its source attribute must be a string.

提取转换与对应的参数映射稍有不同，因为它的源属性必须是字符串。

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In Listing 1, the target of the unload event is the body element, and the event handler is the bit of script inside the onunload attribute.

清单1中unload事件的目标是body元素，事件处理程序onunload属性中为数不多的那一点脚本。

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In truth, security attribute propagation is a bit more complicated than the above definition, because the attributes can be WebSphere tokens, custom tokens, attributes on a token, or custom objects.

实际上，安全属性传播要比前面的定义更复杂一些，因为这些属性可以是WebSphere令牌、自定义令牌、令牌的属性、或者自定义的对象。

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