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Distributed Workflows: the OpenKnowledge Experience

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Original languageEnglish
Title of host publicationProceedings of the International Workshop on Semantic Extensions to Middleware
PublisherSpringer-Verlag GmbH
Number of pages11
ISBN (Electronic)978-3-540-88875-8
ISBN (Print)978-3-540-88874-1
Publication statusPublished - 2008

Publication series

NameLecture Notes in Computer Science
PublisherSpringer Berlin / Heidelberg
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Software systems are becoming ever more complex, and one source of complexity lies in integrating heterogeneous subsystems. Service Oriented Architectures are part of the answer: they decouple the components of the system. However normally SOA is used from a centralised perspective: a single process invokes remote services, unaware of being part of a workflow. We claim that the centralised, or orchestration-based, approach cannot scale well with increasing complexity and heterogeneity of the components, and we propose an alternative distributed, or choreography-based, approach, that forces developers to think in terms of actors, roles and interactions. We first present the OpenKnowledge framework, designed according to choreography-based principles and then show how a complex, distributed model for managing the triple assessment of patients suspected with breast cancer can be easily implemented using this framework.

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