返回当前节点上与指定命名空间前缀绑定的命名空间URI,如果没有,返回null,如果参数为null,返回默认的命名空间.
根据 bug 312019, 该方法对动态指定的命名空间不起作用.(也就是通过Node.prefix指定的).
Node.lookupNamespaceURI
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