Main governmental data are hidden or they have different formats and hard accessibility, because they tend to be though for internal use.
To provide open data in a format such as RDF adds value, transparency and interoperability.
This page allows to query the information of the 2001 Spanish Census (restricted to 1 Million triples) in RDF. See the RDF vocabulary and the fields originally specified in the INE for further details.
Some examples of queries.