Group = function(parent, $el) {
    if (!(this instanceof Group)) {
        return new Group(parent, $el);
    }

    Node.call(this, parent, $el);

    /**
     * @member {object[]}
     * @readonly
     */
    this.rules = [];

    /**
     * @name condition
     * @member {string}
     * @memberof Group
     * @instance
     */
    this.__.condition = null;
}
Group object
@constructor
@extends Node
@param {Group} [parent]
@param {jQuery} $el