/** Creates a vertex. */
 public Object createVertex(IUserInfo info) {
   return writer.createVertex(handler.vertexCopy(info));
 }
 /** Creates an edge. */
 public Object createEdge(Object source, Object target, IUserInfo info) {
   return writer.createEdge(source, target, handler.edgeCopy(info));
 }
 /** Creates the graph info. */
 public void setUserInfo(IUserInfo info) {
   writer.setUserInfo(handler.graphCopy(info));
 }