Focused Entailment Graphs for Open IE Propositions

Open IE methods extract structured propo-sitions from text. However, these propo-sitions are neither consolidated nor gen-eralized, and querying them may lead to insufficient or redundant information. This work suggests an approach to or-ganize open IE propositions using entail-ment graphs. The entailment relation uni-fies equivalent propositions and induces a specific-to-general structure. We create a large dataset of gold-standard proposition entailment graphs, and provide a novel algorithm for automatically constructing them. Our analysis shows that predicate entailment is extremely context-sensitive, and that current lexical-semantic resources do not capture many of the lexical infer-ences induced by proposition entailment.