Open Government — the right for citizens to access governmental information — has a long tradition in the Netherlands. Recent Dutch legislation requires government agencies to publish their data electronically, so that citizens can subscribe to information of their interest by e-mail. In order to facilitate this, we present a solution where we enrich government publication with knowledge graphs based on RDF/OWL. In this way, we can deal with the considerable variation in the ways that local governmental agencies enrich their data and publications. As a result, we can create a central subscription hub without having to force complex standards on small-size local agencies. We discuss the specific goals we need to obtain, and how we leverage semantic web technology to achieve these goals.