You have to create a new object of the child entity and delete the previous object.
你必须创建一个新对象的子实体和删除前面的对象。
This feature identifies which side is the master entity (driver) and which entity is the child and enhances the data access plan.
该特性定义了哪一边是主实体(驱动器)，哪个实体是子实体，并增强了数据访问计划。
If there is no entity declaration that matches, an empty text node is attached as the only child of the entity reference node.
如果没有匹配的实体声明，则附加一个空的文本节点作为实体引用节点的唯一子级。
Category to child connector can only be connected to entity or category shapes.
类别与子表连接线只能连接到实体或类别形状。
Category to child connector can only be connected to entity or category shapes.
类别与子表连接线只能连接到实体或类别形状。
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