它会返回给定实例的最顶层元素节点。
This returns the topmost element node of the given instance.
您已经看到应用于整个页面的规则，然后确保应用到元素上的其他任何规则都不会受最顶层规则的影响。
You've got to see what's applied to your entire page, and then make sure that there are elements that none of the other rules apply to that are affected by your topmost rule.
最简单的方法是仅仅使rdf： rdf元素作为soap体的单个顶层元素，说明见清单6。
The simplest approach is simply to make the RDF: RDF element the single top-level element of the SOAP body, as illustrated in Listing 6.
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