I did some research and found that I could do the conversion from the hbm.xml file to
the annotated classes in two steps.
The first step would be to use the org.hibernate.tool.hbm2ddl.SchemaExport
class in Hibernate to create the database tables.
Then use the Hibernate Pojo Generator found at:
http://hibernatepojoge.sourceforge.net/
to convert from the database tables to the annotated classes.
Using the source code, I could pick and choose the functions that I want to use.