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A key principle in the design of new e-services is interoperability-by-design, which concerns the technical, semantic and organisational levels. Complementary to the existing interoperability and mainly for the flexible exchange and updating of data between public sector systems and services, the National Data Corridor infrastructure will be implemented, consisting of a centralised (national level) installation of a platform for servicing data streams. This will allow the gradual exploitation of architectural approaches based on asynchronous production and asynchronous and scalable consumption of data-products and domain-events in real time between distributed public services and processes, while avoiding strong interdependencies between them at the technological level. This will foster interoperability between existing heterogeneous systems, the organised and secure real-time availability of their data changes concerning third parties, and enable the development of domain services that can easily disseminate their primary data and/or their changes to services and systems that need them. This infrastructure can be used to facilitate the orchestration of communications between the processes of heterogeneous public service departments in order to provide integrated services to the citizen. At the same time, it can facilitate the gradual deconstruction of large monolithic systems into more manageable, flexible and cost-effective software modules.

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