Orange: Review Architecture Document and Top-Level Roadmap

In order to prepare the external review in September, Orange team should provide support to the architecture document. 

Areas related to data discovery, data access, authorisation and presentation layer are the ones closer to this team but all sections could get benefit of their review

Also, the section

6.2.1.     Data streamer and the data mesh paradigm

is related to the exercises done by Orange with the service discovery integration.

Also, comments on the top-level roadmap will be acknowledged