linux系统的设备树文档，有段看不明白，求解释
原文链接为：http://www.devicetree.org/Device_Tree_Usage不懂的段落为下段：
Since the address domains are contained to a node and its children, parent nodes are free to define whatever addressing scheme makes sense for the bus. Nodes outside of the immediate parent and child nodes do not normally have to care about the local addressing domain, and addresses have to be mapped to get from one domain to another.
以我对这些单词的理解无法翻译出能够通顺直白的语义，望高手指点下。 因为地址域包含了一个节点和它的子节点，父节点可以自由去定义 由于地址域包含在节点及其子节点中，因此父节点可以自由定义对总线有意义的任何寻址方案。直接父节点和子节点之外的节点通常不必关心本地寻址域，并且必须映射地址以从一个域到另一个域。
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