JAXB marshaller - Don't add namespace to every element

I'm trying to wrap my head around JAXB and namespaces. I have a few annotated classes like for example.

@XmlRootElement
public class Message  extends AbstractStanza {
  @XmlElement
  private String body;

  public String getBody() {
    return this.body;
  }
}

and

@XmlRootElement
public class Error {

  @XmlElement(namespace = "urn:ietf:params:xml:ns:xmpp-streams")
  private String text;

  @XmlAnyElement(lax = true)
  private List<Object> nodes;

}

All these objects (among some others that look similar) are known in the JAXBContext umarshalling this works fine and as expected. But when I try to marshall a class - the message class for example - I get the xmpp-streams namespace added to all my elements. like this:

<message xmlns:ns2="urn:ietf:params:xml:ns:xmpp-streams"/>

instead I want this to read just <message /> and have that particualar namespace only added when actually marshaling an <text> element as a child of Error.

What about namespaces in JAXB/xml am I missing here? What can I do to fix this?