This not only forces you to clean up the source nodes that are left behind, but it can also be expensive if the subtree you're moving is large.

这不仅要求清除留在后面的源节点，而且当要移动的子树很大时需要付出很高的代价。

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It validates your input and output against an XML schema, and it allows you to refer to source nodes in the stylesheet based on their schema type.

它可以用XML模式验证输入和输出，允许根据schema类型引用样式表中的源节点。

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Using the Asymmetric Cryptographic System, we can authenticate and encrypt sensitive routing messages, and only source nodes which issue RREQ can validate messages.

这个方案采用公钥体制对敏感的路由信息进行认证和加密，只有产生路由请求信息RREQ的源节点才能验证这些敏感信息。

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