Source e Nodes 来源节点
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。
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。
The information source nodes take the inherent connection among information processing nodes as the leaf nodes of layer structure and connect them.
信息源节点则按其与信息处理节点的固有连接作为层次结构的叶子节点进行连接。
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