Omni Systems, Inc. Mif2Go User's Guide, Version 55
> 16 Configuring DITA maps > 16.4 Mapping FrameMaker files to bookmap components > 16.4.4 Assigning a divider role to a section file or chapter
When filename=Part,
filename logically contains all
Chapters until the next Part,
or the first Appendix, or the first Back
item. Part may precede Chapter
if the intended divider is not a file of its own; for example:
Part may precede Appendix
when AllowPartAppendix=Yes (see §16.3.4 Extending <part> to include <appendix>),
although this is not valid DITA 1.1.