The SEI is a standard Java interface. It defines a set of methods that a class will implement. It can also define a number of member fields and constants to which the implementing class has access.
In the case of an SEI the methods defined are intended to be mapped to operations
exposed by a service. The SEI corresponds to a wsdl:portType element. The
methods defined by the SEI correspond to wsdl:operation elements in the
wsdl:portType element.
Note: JAX-WS defines an annotation that allows you to specify methods that are not exposed as
part of a service. However, the best practice is to leave such methods out of the SEI.
The below shows a simple SEI for a stock updating service.
Simple SEI
package org.apache.cxf;
public interface QuoteReporter {
public Quote getQuote(String ticker);
}