(保证在每个表中都有唯一主键) 域完整性规则(Domain Integrity Rule) 是指关系中属性取值的正确性限制。包括数据类型、精度、 取值范围、是否允许空值等。
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为确保堆和不朽内存区域的完整性，RTSJ 定义了使用作用域内存的规则。
To ensure the integrity of the heap and the immortal memory area, the RTSJ defines rules for using scoped memory.
为了确保对象之间引用的完整性，RTSJ定义了管理一个内存区域(堆、不朽内存、作用域内存)中的对象如何引用其他内存区域对象的规则。
To ensure the integrity of references between objects, the RTSJ defines rules that govern how objects in one memory area (heap, immortal, or scope) can refer to objects in other memory areas.
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