厂商层次结构：这种层次结构中的每个类别代表一个厂商或零售商。
Vendor hierarchy: a category in this hierarchy represents a vendor or reseller.
不仅如此，不同的JAX - RPC厂商可能提供不同层次的支持。
Beyond that, different JAX-RPC vendors might offer different levels of support.
如果不考虑其具体应用的领域、代码沿袭或厂商，许多NMS产品在层次组成上都有类似的概念。
Many NMS products have similar conceptual level composition, regardless of the specific domain of their application, the code heritage, or the vendor.
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