Abstract
We describe a model and notation for specifyingand enforcing aspects of integrity policies, particularlyseparation of duties. The key idea is to associate atransaction control expression with each informationobject. This expression constrains the transactionswhich can be applied to that object to occur in thespecified pattern. As operations are actually executedthe transaction control expression gets converted to ahistory. This history serves to enforce separation ofduties. We...

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