Statistics Netherlands has recently performed a proof of concept for a Table Joining Service (TJS) together with the Dutch Kadaster, Geonovum and the Dutch hosting organisation for INSPIRE services PDOK. This was done with the help of a Eurostat Grant. It resulted in an impact analysis that can be downloaded here.
The TJS is an OGC online service that links online tables to online geoservices with an online geoservice (WFS, WMS) as a result. It is the solution for publishing INSPIRE themes that have no geometry on its own, like Human Health and Population Distribution. But it has many more advantages that can be found in the impact analysis.