player/js/utils/expressions/PropertyInterface.js

var PropertyInterface = (function () {
  return function (propertyName, propertyGroup) {

    var interfaceFunction = {
      _name: propertyName
    }

    function _propertyGroup(val) {
      val = val === undefined ? 1 : val
      if(val <= 0) {
        return interfaceFunction;
      } else {
        return propertyGroup(--val);
      }
    }

    return _propertyGroup;
  }
}())