[[A constituent question construction is an interrogative sentence in which the unknown piece of the propositional content requested of the addressee is a semantic component of the proposition other than its polarity.]]
information question (a.k.a. content question, WH question) (INF/CXN) = an interrogative in which the unknown piece of the propositional content requested of the addressee is a semantic component of the proposition other than its polarity; and the construction expressing this function. Example: Who is coming? is an instance of the English information question construction, expecting an answer identifying the person(s) who is/are coming. Information questions, unlike polarity questions, contain an interrogative pronoun. (Section 12.3.1)