In this book, new approaches are presented for detecting and extracting simultaneously relevant and novel information from unstructured text documents. A major contribution of these approaches is that the information already provided and the extracted information are modeled semantically. This leads to the following benefits a ambiguities in the language can be resolved b the exact information needs regarding relevance and novelty can be specified and c knowledge graphs can be incorporated.More specifically, this book presents the following scientific contributions1. An assessment of the suitability of existing