PortType

The Service Definition Interface (SDI) is (generally) the portType. So this wsdl

<message name="empty">
<message name="AddEntryRequest">
  <part name="name" type="xsd:string"/>
  <part name="address" type="typens:address"/>
</message>
<portType name="AddressBook">
  <operation name="addEntry">
 <input message="tns:AddEntryRequest"/>
 <output message="tns:empty"/>
  </operation>
</portType>

maps to the Java code

public interface AddressBook extends java.rmi.Remote {
 public void addEntry(String name, Address address) throws
  java.rmi.RemoteException;
}