An important type of entailment rule specifies the entailment relation between natural language predicates, e.g., the entailment rule 'X invade Y → X attack Y' can be helpful in inferring the aforementioned hypothesis.
substantial effort has been made to learn such rules (Lin and Pantel, 2001;Sekine, 2005;Szpektor and Dagan, 2008;Schoenmackers et al., 2010).