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== Reference Architecture ==
[[File:Architecture of Interoperable Information Systems.gif|thumb|right|Architecture of Interoperable Information Systems]]
Following the work on interoperable information systems conducted in European Research Projects (e.g. <ref>R4eGov, ATHENA, Interop NOE</ref>), in 2010 the Architecure of Interoperable Information Systems (AIOS) was published <ref>Ziemann 2010</ref> as a reference for the construction of loosely coupled, interoperating information systems and for the systematic, model-based enactment of collaborative business processes.
The AIOS originally aims at large organizations who want to interoperate with each other
Though the AIOS comprises all models needed for the enactment of collaborative business it focuses on '''design time''' aspects, e.g. the systematic development and configuration of interoperable information systems. The deployment of these models and the infrastructure to execute them are not described by AIOS. However, one '''run time''' component of the AIOS is a repository, in which each organization publishes the content of its [[Business Interoperability Interface]] (BII) to collaboration partners. Since it comprises external views on information system elements, it can support (runtime) publishing and discovery functionalities as needed in [[Service-oriented Architecture]]: In the BII, the externally relevant processes, services, organization structures etc. are described on various levels of technical granularity, enabling other organizations to search also for business-level concepts and not only for technical artifacts. Here, different from the traditional SOA approach, instead of one central service directory, various partner-specific repositories are implemented. === Structure ===
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