The system ID is assigned by the messaging system when a message is created or received on an inbound service definition.
当消息被创建或被入站服务定义接收到时，系统ID被消息系统指定。
For example, Listing 8 shows a DTD very similar to Listing 6, but with a different system ID specified for the NHLCopyright reference.
譬如，清单8显示的DTD非常类似于清单6，但对于NHLCopyright引用指定了不同的系统标识。
I also knew that the system serial number was guaranteed not to change, so I wasn't going to have application licensing problems because the system ID had changed.
我也知道系统序列号肯定不会变，所以不会出现由于系统ID变化导致的应用程序许可证问题。
I also knew that the system serial number was guaranteed not to change, so I wasn't going to have application licensing problems because the system ID had changed.
我也知道系统序列号肯定不会变，所以不会出现由于系统ID变化导致的应用程序许可证问题。
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