Anything else is interactive, including: predictive structures, discourse
labelling, cross references, and so on. Any such organizational features
serve to present the text interactively, by taking account of the readers'
likely knowledge and reactions at different points in the text. Thus, to take a
rather obvious example, I began this paragraph by writing "It might be
thought that ... ", in order to take into account an objection to my argument
which I predicted at this point from some readers.