The image shows an EJB application invoking an EJB on the left side. To the right is an arrow labeled Invoke with SDO Parameters pointing into a box labeled Exposed Service. Inside this box is a smaller box labeled Service. To the right is a box labeled SOA Composite Application. To the right is a box labeled External References. Inside this box is a smaller box labeled Reference. An arrow on the right labeled Invoke with SDO Parameters points to a box labeled EJB Application.