<\body> Complex documents often contain footnotes or floating objects, which appear differently on pages as the main text. In fact, the content of such complex documents use several , one for the main text, one for the footnotes, one for floats, and still another one for two column text. The different flows are broken across pages in a quite independent way. In order to insert a footnote, you may use . The number of columns of the text may be changed in . <\initial> <\collection>