app.filter('attributeName', function($sce) {

return function(input) {
  var parts = input.split('.');
  if (parts.length > 1) {
    var prefix = _.take(parts, parts.length-1).join('.');
    return $sce.trustAsHtml('<span class="attribute-prefix">' + prefix + '.</span>' + _.last(parts));
  }
  return $sce.trustAsHtml(input);
};

});