When Are Two Workflows the Same?
Hidders, Jan, Dumas, Marlon, van der Aalst, Wil M.P., ter Hofstede, Arthur H.M., & Verelst, Jan (2005) When Are Two Workflows the Same? In Atkinson, Mike & Denhe, Frank (Eds.) Eleventh Computing: The Australasian Theory Symposium (CATS2005), February 2005, Newcastle, Australia.
In the area of workflow management, one is confronted with a large number of competing languages and the relations between them (e.g. relative expressiveness) are usually not clear. Moreover, even within the same language it is generally possible to express the same workflow in different ways, a feature known as variability. This paper aims at providing some of the formal groundwork for studying relative expressiveness and variability by defining notions of equivalence capturing different views on how workflow systems operate. Firstly, a notion of observational equivalence in the absence of silent steps is defined and related to classical bisimulation. Secondly, a number of equivalence notions in the presence of silent steps are defined. A distinction is made between the case where silent steps are visible (but not controllable) by the environment and the case where silent steps are not visible, i.e., there is an alternation between system events and environment interactions. It is shown that these notions of equivalence are different and do not coincide with classical notions of bisimulation with silent steps (e.g. weak and branching).
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|Item Type:||Conference Paper|
|Keywords:||workflow, bisimulation, comparative concurrency semantics|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2005 Australian Computer Society|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||19 Jul 2006|
|Last Modified:||29 Feb 2012 13:11|
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