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Following the work on interoperable information systems conducted in European Research Projects<ref>Interop NOE (2004 to 2007, project number IST-2004-508011), ATHENA (2004 to 2007, “Advanced Technologies for Interoperability of Heterogeneous Enterprise Networks and their Application”, project number IST-2004-507849) or R4eGov (2006 to 2009, project number IST-2004-026650)</ref> in 2010 the Architecure of Interoperable Information Systems (AIOS) was published 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 aims primarily at large organizations that want to interoperate with each other. To this aim it describes how internal information system elements can be systematically connected with the information systems of collaboration partners. The main elements of the AIOS are:
# Description of the different data types comprised in interoperable information system as well as their relationships. This is also called the '''static''' part, or the ''structure'' of the architecture. It tells organizations which information elements (e.g. descriptions of messages, exchange sequences, roles and services) they have to provide to collaboration partners and how they can optimally correlate these to internal elements.
# Description of different building paths for implementing or adjusting interoperable information systems. This is also called the '''dynamic''' part of the architecture. It tells organization, how to iteratively develop the elements mentioned above.
# Concept for the technical '''components needed to implemenent''' the architecture, for example design tools, internal and externally visible repositories.
One element comprised in the third category is a '''"BII-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 provides 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 ==
[[File:Architecture of Interoperable Information Systems.gif|thumb|right|Architecture of Interoperable Information Systems]]
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