BOM entries are files that describe a part of a Business
Object Model (BOM).
Creating a BOM without a XOM
You can work with BOM entries to create business elements
and map them to execution elements in the XOM, or reference BOM entry
files in other rule projects.
Creating a BOM entry from a XOM
If you create a BOM entry from a XOM, you can subsequently
extend the BOM without modifying the XOM.
Specifying the order of BOM entries
If you have an element of the same name in more than one
BOM entry, you can control which element to use.