The namespace prefix of type attribute in return element is lost in the marshaled message for GetCars object:

-------Car.java----------
@XmlSeeAlso(

{Toyota.class, Ford.class}

)

public abstract class Car {
private String model;
private String make;

public String getModel()

{ return model; }

public void setModel(String model)

{ this.model = model; }

public String getMake()

{ return make; }

public void setMake(String make) { this.make = make; }
}

-----Ford.java----------
public class Ford extends Car {

private String color;
private final String make="Ford";

public Ford() { setMake("Ford"); }

public String getMake() { return make; }

public Ford(String model, String color)

{ setModel(model); this.color = color; }

public String getColor()

{ return color; }

public void setColor(String color)

{ this.color = color; }

}

--GetCars.java---------
@XmlRootElement(name = "getSedansResponse", namespace = "http://jbossws.jboss.org")
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "getSedansResponse", namespace = "http://jbossws.jboss.org")
public class GetCars {

@XmlElement(name = "return", namespace = "")
private List<Car> _return;

/**
*

• @return
• returns List<Car>
  */
  public List<Car> getReturn() { return this._return; }

/**
*

• @param _return
• the value for the _return property
  */
  public void setReturn(List<Car> _return) { this._return = _return; }

  }