The file is in json format and contains a list of entities (which may be known or NIL) with the mentions that have been identified for them. The fields are as follows: idx: Index of the entity name: Name of the entity (None, if NIL-entity) is_nil: Whether the entity is a NIL-entity mentions: (list) page: Name of the page where the mention is found listing: Index of the listing where the mention is found item: Index of the item within the listing where the mention is found text: Mention text