The general architecture allows for such a constraint to be validated from any source which mentions the two entities, including tables, list pages, navboxes, and perhaps wikified newswire articles [5,6].
2009, Iustin Dornescu, "Semantic QA for Encyclopaedic Questions: EQUAL in GikiCLEF" in Peters, C. et al., Multilingual Information Access Evaluation I: Text Retrieval Experiments, p. 330