Techniques have been developed to categorize questions based on the nature of these information needs in the context of the TREC QA challenge (Harabagiu et al., 2000), and to identify questions asking for similar information (Shtok et al., 2012;Zhang et al., 2017;Jeon et al., 2005); questions have also been classified by topic (Cao et al., 2010) and quality (Treude et al., 2011;Ravi et al., 2014).
our work is not concerned with the information need central to QA applications, and instead focuses on the rhetorical aspect of questions.