  Structured information is an important knowledge source for automatic
verification of factual claims. Nevertheless, the majority of existing research
into this task has focused on textual data, and the few recent inquiries into
structured data have been for the closed-domain setting where appropriate
evidence for each claim is assumed to have already been retrieved. In this
paper, we investigate verification over structured data in the open-domain
setting, introducing a joint reranking-and-verification model which fuses
evidence documents in the verification component. Our open-domain model
achieves performance comparable to the closed-domain state-of-the-art on the
TabFact dataset, and demonstrates performance gains from the inclusion of
multiple tables as well as a significant improvement over a heuristic retrieval
baseline.
