Managing the relationship instance data during runtime.
从运行时管理关系实例数据。
Invoke Custom service Factory during runtime to initialize a service object.
在运行过程种调用Custom Service Factory来实现服务对象的初始化。
If this is not the case, there will be data conversion errors during runtime.
如果不是这样，在运行时会产生数据转换错误。
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