远程谓词调用在逻辑上可分为三个层次，从低到高分别为网络服务层、系统服务层、应用层。
Remote predicate call can be logically divided into three layers. From the lowest layer to the highest one are respectively network service, system service, and application.
它取决于web应用的所有环境：后端存储，网络服务器和网络应用程序本身(以及可能的其他层或应用程序)。
And it depends on all layers of a web application environment: the back-end storage, the web server and the web application itself (and possibly other layers or applications).
公共对象层管理网络服务对象，访问现场总线设备，元件层实现不同现场设备间的互操作。
Networks service object was managed, and the field bus equipments were visited with public target layer. The inter-operation among different equipments was realized with component layer.
公共对象层管理网络服务对象，访问现场总线设备，元件层实现不同现场设备间的互操作。
Networks service object was managed, and the field bus equipments were visited with public target layer. The inter-operation among different equipments was realized with component layer.
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