The vision is (in Dutch, unfortunately) well summarised in https://lokaalbestuur.vlaanderen.be/gelinkt-publiceren-en-melden, the video. Also some information here: https://www.vlaanderen.be/agentschap-binnenlands-bestuur/blikvangers/lokale-besluiten-als-gelinkte-open-data These were the initial seeds; the project has grown in scope. Even though some of the initial goals still need realisation.
Development here is heavily data-driven. Data sharing between applications only work if data model is shared Hence the importance of data models.