所谓的主键(Primary Key)是指可以用来决定某一个体的Instances，至于其它非主键(Non-Primary key)的部分则包含了替代键(Alternate Key)及外来键(Foreign Key)。
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Non Primary Key 非主属性或非码属性
This indicates that the relationship will be created for a static non-primary key property.
这表明将为一个静态非主键属性创建关系。
The relationship defines a static relationship for the non-primary key state property for each of the four business objects.
该关系分别为这四个业务对象的非主键 state 属性定义一个静态关系。
You can use dynamic relationships to correlate primary keys from a set of related business objects and static relationships to correlate non-primary key properties.
可以使用动态关系来关联一组相关业务对象的主键，而使用静态关系来关联非主键属性。
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