The customization developer can add new domain. Below are the steps to add a new domain.

1. Create new domain class. The new domain class must extend AbstractDomainObject and implement IPersistenceObject
2. Identify attributes and operations supported by the domain and add them to above domain class accordingly
3. The domain object will typically have associated DTO that encapsulates same fields as in domain. This DTO will be used in request and responses. An assembler will be used to map fields between domain object and the DTO. Below diagram depicts this relationship.
   
   
   Description of the illustration extensibilityguide21.png
   
   
4. Configure this new domain for appropriate entity level.

           insert into digx_me_entity_determinant_b 
           (DOMAIN_OBJECT_NAME, DETERMINANT_TYPE, REPRESENTED_FIELD,IS_FEATURE_ENABLED)values 
           ('<Fully qualified domain name>', '<Determinant Type>', '<Represented Name>', 'Y');
           For example,insert into digx_me_entity_determinant_b 
           (DOMAIN_OBJECT_NAME, DETERMINANT_TYPE, REPRESENTED_FIELD,IS_FEATURE_ENABLED)values 
           (' com.ofss.digx.cz.domain.payment.entity.payee.Payee', 'BNU', 'New Payee','Y');