The group of experts working in a thematic working group has knowledge of existing data models and implementations and is responsible for the development of the domain model.
If you have any comments on specifications, please open an issue from here.
The exercise that is currently ongoing is the exercise around "Buildings and building units".
Link to the ICEG review group where you can find the description of the process that is followed to create a standard: https://github.com/belgif/review
Standards overview page: https://github.com/belgif/review/tree/master/OverviewStandards