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FIWARE based architectures are open, modular and scalable. This means that integrating existing systems can be quite easy thanks to this characteristic inherent to FIWARE. As a result FIWARE can coexist with legacy architectures, Furthermore FIWARE does not preclude operating systems or programming environments.

Having said that, and with regards to Context Data managed by the city, the NGSI9 context providers are a nice mechanism to integrate existing data sources and expose them as NGSI entities. For more information, please check

http://fiware-orion.readthedocs.io/en/master/user/context_providers/index.html