我们首先遍历树，传递一个仅打印所访问的节点并返回该节点的函数。
We first walk the tree and pass a function that merely prints the node being visited and returns the node.
可以使用现有Apache XERCES中的支持直接打印节点。
A node can be directly printed using support existing in Apache XERCES.
read - from - stdin循环中的第一部分将打印聚类描述，并打印在聚类内显示的节点。
The first section inside the read-from-stdin loop prints out the cluster description, along with the node to display inside the cluster.
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