Abstract
Discovery of documents, data sources, facts, and opinions is at the very heart of digital information and knowledge services. Being able to search, discover, compile, and analyse relevant information for a user’s specific tasks is of utmost importance in science (e.g., computational life sciences, digital humanities, etc.), business (e.g., market and media analytics, customer relationship management, etc.) , and society at large (e.g., consumer information, traffic logistics, health discussions, etc.).