�|Description:�%
The \prefaceformat markup allows you to modify the defaults that control the
appearance of the preface title. There are two submarkup:
�|titleformat�% controls the appearance of the part title banner. You
may use markup such as \newpage, \verticalspace, and \centerline within
\titleformat as Nested Markup. You may also use:
�|prefacetitle.�% prints the most recent preface title.
�|incontents�% places the preface title in contents (if one is printed).
Printing can be suppressed by changing to "no."
�|Example:�%
In this example, the preface starts a new page, the title is centered in
bold, and one line is skipped afterwards. No preface is put in contents.
