The IMF runs a web-based database of international social and economic metadata (information about data-series) which can be easily queried. It can be linked to different levels, from less detailed to more detailed metadata. It covers countries committed to the IMF's more rigorous Special Data Dissemination Standard (protocol for the production and publication of statistics) and many social, economic and demographic data-sets. It can give on-screen comparisons between counties of metadata for specified data headings.