When the number of maps is low, you can use routing or filter nodes in the message flow, but this method becomes increasingly difficult as the number of maps used by the message flow increases.
当映射数量很少时，您可以在消息流中使用路由或过滤器，但是随着消息流所用映射数量的增加，使用这个方法的难度也在增加。
Rather than just dumping every attribute back into XML, you might want to filter and massage nodes before writing them.
可能不仅仅是将每个属性转储到 XML 中，在写入之前，还要过滤和处理节点。
Only document nodes and elements can be parents of other nodes, so that filter leaves only document nodes.
因为只有文档节点和元素才能作为其他节点的父节点，因此筛选过后仅留下了文档节点。
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