While many countries publish some of their data to public, it is mostly in document, web page, reports format. This is not linked to even other data set coming from same source next time.
What is needed that this is provided as raw data having linkages to other known data sets at least in ministry/ department with a provision of adding new linkages by other departments/ ministeries/ public at large.
This has power to trigger new questions connecting different fields of studies and allowing us to see how new solutions can be built with combined knowledge of many.
Dr. APJ Kalam (Ex-President of India) has proposed to buld a World Knowledge Platform to leverage combined knowledge of all nations to solve world most challenging problems.
Tim Berners Lee explains how Linked Data can give us a more powerful WWW World.