The document discusses several use cases for text mining and controlled vocabularies at the Goettingen State and University Library. It describes a project called eAqua that compares semantic graphs between journal article headings and full texts. It also discusses a project called Europeana 4D that visualizes data from multiple sources on an interactive timeline and map to show connections and relationships. Guidelines are provided for how to build datasets in KML format and contribute them to the Europeana 4D prototype visualization tool.