    /*
 *  Node.java
 *
 *  Copyright (c) 1998-2001, The University of Sheffield.
 *
 *  This file is part of GATE (see http://gate.ac.uk/), and is free
 *  software, licenced under the GNU Library General Public License,
 *  Version 2, June 1991 (in the distribution as file licence.html,
 *  and also available at http://gate.ac.uk/gate/licence.html).
 *
 *  Hamish Cunningham, 19/Jan/2000
 *
 *  $Id: Node.java,v 1.13 2002/03/14 16:40:11 hamish Exp $
 */

package gate;
import java.util.*;
import java.io.*;
import gate.util.*;

/** Nodes in AnnotationSets. Immutable.
  */
public interface Node extends IdBearer, Serializable
{

  /** Offset (will be null when the node is not anchored) */
  public Long getOffset();

} // interface Node
