code: function (data) {
        var store = data.subjectIndex,
          diff = [];
        $.each(this.subjectIndex, function (s, ts) {
          var ots = store[s];
          if (ots === undefined) {
            diff = diff.concat(ts);
          } else {
            $.each(ts, function (i, t) {
              if ($.inArray(t, ots) === -1) {
                diff.push(t);
              }
            });
          }
        });
        return $.rdf.databank(diff);
      }
docs: Creates a new databank containing all the triples in this {@link jQuery.rdf.databank} except those in the {@link jQuery.rdf.databank} passed as the argument.
  @param {jQuery.rdf.databank} data The other {@link jQuery.rdf.databank}
  @returns {jQuery.rdf.databank} A new {@link jQuery.rdf.databank} containing the triples in this {@link jQuery.rdf.databank} except for those in the data parameter.
  @example
  var old = $('html').rdf().databank;
  ...some processing occurs...
  var new = $('html').rdf().databank;
  var added = new.except(old);
  var removed = old.except(new);