The wealth of freely available, structured information on the Web is constantly growing. This is especially true for public data from and about governments and administrations. Data‐providing projects, such as DBPedia and Freebase from the linked open data community, as well as structured data from domain‐specific sites, such as senate.gov, USASpending.gov, or epp.eurostat.ec.europa.eu, make it possible to integrate data from multiple sources and thus create new data sets with added value. The recent appointment of Tim Berners‐Lee to lead a review on how the UK government can open up access to official information reinforces this trend. However, the integration of such data sources is far from trivial: Apart from technical difficulties of accessing the data, structural and semantic differences in the data must be overcome. In particular, the various data sets must be standardized, transformed to a common structure, cleaned and finally consolidated into a single, consistent and complete data set.