4.2.6. Message Header Format

    public interface Header
{
	public Call getCall ();
	public void setCall (Call call);
}

    public class Call
{
	public Call ();
	public Call (EPR epr);
	public Call (Call copy);
	public void setTo (EPR epr);
	public EPR getTo () throws URISyntaxException;

	public void setFrom (EPR from);
	public EPR getFrom () throws URISyntaxException;

	public void setReplyTo (EPR replyTo);
	public EPR getReplyTo () throws URISyntaxException;

	public void setFaultTo (EPR uri);
	public EPR getFaultTo () throws URISyntaxException;

	public void setRelatesTo (URI uri);
	public URI getRelatesTo () throws URISyntaxException;
	public void copy();
	public void setAction (URI uri);
	public URI getAction () throws URISyntaxException;
	public final boolean empty();
	public void setMessageID (URI uri);
	public URI getMessageID () throws URISyntaxException;
	public String toString();
	public String stringForum();
	public boolean valid();
	public void copy (Call from);
}