That position number is needed in case the node has siblings of the same type and name, to indicate which one we're referring to.
位置号是必需的，以防节点有相同类型和名称的兄弟节点，这样可以表明我们引用的是哪个节点。
The database can assign sequence Numbers to each node so that it knows the position of each node and can compare the document order of two nodes in constant time.
数据库可以为每个节点分配顺序号，这样就知道每个节点的位置，可以在常数时间内比较两个节点的文档顺序。
Unpack the downloaded Hadoop distribution on each node; $HADOOP_HOME is used below to represent the unpack position.
在每个节点上解压下载的 Hadoop 发行版；下面使用 $HADOOP_HOME 代表解压位置。
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