code: function( obj ){
                  // read the interaction data
                  var data = $.data( this, drag.datakey ),
                      // read any passed options
                      opts = obj.data || {};
                  // count another realted event
                  data.related += 1;
                  // extend data options bound with this event
                  // don't iterate "opts" in case it is a node
                  $.each( drag.defaults, function( key, def ){
                      if ( opts[ key ] !== undefined )
                          data[ key ] = opts[ key ];
                  });
              }
docs: count bound related events