人员可以在各种级别或跨部门连接，而不受正式结构的约束。
People connect at various levels and across departments, without the constraints of a formal structure.
ActiveRecord在使用参考完整性约束的某些场合也会出现问题，因为某些类型的关联可能连接到多个数据库表。
ActiveRecord also has trouble in some cases with referential integrity constraints because some types of associations might connect to more than one database table.
清单6中的约束将操作和连接规则应用到U ML Activity和Modeler Process的内容。
The constraints in Listing 6 apply the action and connection rules to the content of the UML Activity and Modeler Process.
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