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Journal of Computer and System Sciences - Special issu on PODS 2001
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ACM Transactions on Computational Logic (TOCL)
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IBM Systems Journal
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ACM Transactions on Programming Languages and Systems (TOPLAS)
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LICS '06 Proceedings of the 21st Annual IEEE Symposium on Logic in Computer Science
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SOCA '07 Proceedings of the IEEE International Conference on Service-Oriented Computing and Applications
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ACM SIGMOD Record
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The VLDB Journal — The International Journal on Very Large Data Bases
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ICSOC '07 Proceedings of the 5th international conference on Service-Oriented Computing
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ACM Transactions on Computational Logic (TOCL)
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TIME '09 Proceedings of the 2009 16th International Symposium on Temporal Representation and Reasoning
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ICSOC-ServiceWave '09 Proceedings of the 7th International Joint Conference on Service-Oriented Computing
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BPM'07 Proceedings of the 5th international conference on Business process management
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We address the problem of comparing the expressiveness of workflow specification formalisms using a notion of view of a workflow. Views allow to compare widely different workflow systems by mapping them to a common representation capturing the observables relevant to the comparison. Using this framework, we compare the expressiveness of several workflow specification mechanisms, including automata, temporal constraints, and pre-and-post conditions, with XML and relational databases as underlying data models. One surprising result shows the considerable power of static constraints to simulate apparently much richer workflow control mechanisms.