public interface BTPosition extends Position {

	/** Returns the element stored at this position. */

	public Object element() ;
	
	public void setElement(Object o) ;
  	public BTPosition getLeft() ;
  	public void setLeft(BTPosition v);
  	public BTPosition getRight() ;
  	public void setRight(BTPosition v) ;
  	public BTPosition getParent() ;
 	public void setParent(BTPosition v); 
  
}