In wireless link, Packet loss may caused by the high channel bit error rate and nodes mobile, and multi-path routing and node switching will lead to reorder.

对于无线网络，信道的高误码率和节点移动等会导致丢包，多路径路由和节点移动切换等会导致乱序。

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That is, a visitor will have a .visit_FOO() and .depart_FOO() method for each type of node, rather than switching on type within large .startElement() and endElement() methods.

即，访问器会有针对每种类型节点的 .visit_FOO() 和 .depart_FOO() 方法，而不是在大型的 .startElement() 和 endElement() 方法中按类型进行切换。

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At the switching node, the label or payload extraction can be realized simply through an optical bandpass or notch filter respectively.

在交换节点出，标签或有效载荷提取可通过光带通或陷波滤波器实现。

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