docs: function _add_item(in_arg_key, data){
  
  	var retval = false;
  	if( typeof anchor.current_data[in_arg_key] == 'undefined' ){
  	    // BUG/TODO: this should be a copy.
  	    anchor.current_data[in_arg_key] = data;
  	    //ll("add_item: adding key (w/data): " + in_arg_key);
  	    retval = true;
  	}
  	return retval;
      }