Semantic Enrichment for Non-factoid Question Answering

Non-factoid question answering system answers questions which are not fact-based and difficult to answer. The paper discusses different taxonomies of semantic relations that are utilized for answering different types of non-factoid questions. Various adverbial clauses are explored for why-type and how-type questions. Different challenges for identifying semantic relations with their approaches to address them are also discussed. Further, the paper briefs researches that used semantic relations in modules of QAS with some future directions.