The Open Government Data movement which recently becomes visible in various countries promotes openness for public sector information.

This is often materialised with public sector catalogues becoming available through governmental portals where public agencies make their datasets available to the general public. There are two main prerequisites for establishing an Open Data policy: a) high availability of the data, preferably in formats that are both human and machine friendly and b) openness, meaning allowing reuse of the data for all purposes and with no restrictions. Interestingly, and despite the clear move towards Open Data, there is currently very little discussion, if any, on Open Government Metadata. Is such discussion useful and relevant in the more general topic of eGovernment interoperability at a European level?