Another common knowledge source is machine-friendly databases, which organize world facts in the form of a table or a graph (Berant et al., 2013;Pasupat and Liang, 2015;Bordes et al., 2015;Saha et al., 2018;Talmor and Berant, 2018).
understanding their structure requires expertise, making it challenging to crowd-source large QA datasets without relying on templates.