the construction that expresses a identificational information packaging. The presupposed open proposition may be evoked by an alternative proposition that differs from the identificational construction by only the focus. Example: in It was Ollie who was playing the piano, the information in the identificational construction is divided into the presupposed open proposition X was playing the piano, and the focused information Ollie, and what is being asserted is X = Ollie. The term focus is sometimes used as a synonym for identificational, but this term is used differently here. (Sections 10.1.2, 11.1, 11.4.1)