'body-file: Replaces the body with the content of the specified file.
'bottom: Inserts the specified string at the bottom of the body.
'bottom-file: Inserts the specified file at the top of the body.
-'header-top: Inserts the specified string at the top of the current part.
-'header-bottom: Inserts the specified string at the bottom of the current part.
+'part-top: Inserts the specified string at the top of the current part.
+'part-bottom: Inserts the specified string at the bottom of the current part.
'template: Applies the specified template.
(refer to the next subsection)
@end example