It can handle dependencies, such as the rule that if a source file is modified, its corresponding object file must be regenerated by recompiling the source.
它可以处理相关性，例如有这样的规则：如果源文件被修改，那么必须通过重新编译该源文件来重新生成其对应的目标文件。
Relationship delete Rules: a relationship's delete rule specifies what should happen if an attempt is made to delete the source object.
关系删除规则：关系的删除规则指定如果尝试删除源对象，应该发生什么。
Relationship delete Rules: a relationship's delete rule specifies what should happen if an attempt is made to delete the source object.
关系删除规则：关系的删除规则指定如果尝试删除源对象，应该发生什么。
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