/****
 *
 * Class Graph is a simplistic model of data that will be viewed in a box arrow
 * diagram.  Here we have Node and Link classes that are viewed as boxes and
 * arrows, respectively.
 *
 * Users of the box-arrow view class may subclass from Node and Link if model
 * specs make such subclassing appropriate.  Otherwise, box-arrow users may use
 * the design and implementation of the Node and Link classes as guides to
 * establish an appropriate model/view relationship with the box-arrow view
 * class.
 *
 */

class Graph : Model {

  protected:
    BoxList* bl;	// List of nodes
    LinkList* ll;	// List of connecting edges
};

class Node : Model {
};

class Link : Model {
};