...
...
There are variations on this pattern for certain entities, but this description is generally applicable in this data model. Note that the default types for the data model are defined in ofbiz/commonapp/entitydef/datamodel-data.sql.
Deprecated Entities
Entities prefixed with 'old' are deprecated. The underlying table names remain unchanged (see the table-name attribute in the entity definition).
Common
The Common package is meant to contain entities that are for general use and may be used by entities in many other packages.
...