It is understood that semantic typing is a key component in many natural language understanding tasks, including Question Answering (Toral et al., 2005;Li and Roth, 2005) and Textual Entailment (Dagan et al., 2010(Dagan et al., , 2013.
the ability to type mentions semantically across domains and text genres, and to use a flexible type hierarchy, is essential for solving many important challenges.