例如，可以使用这个方法去掉注释，将CDATASection节点转换为Text节点，或者放弃树中所有命名空间声明属性。

For example, you can use this method to get rid of comments, to transform CDATASection nodes into Text nodes, or to discard all the namespace declaration attributes from the tree.

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在输出端，可以创建一个属性以它的名义添加命名空间声明。

On the output side, you can create an attribute just to add a namespace declaration for its name.

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safe：在wsdl扩展命名空间中，此属性声明该操作是等幂的。

WSDLX: safe: From the WSDL extensions namespace, this attribute declares that this operation is idempotent.

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