Наследование: System.Xml.XmlAttribute, IConfigErrorInfo
        public override XmlNode CloneNode(bool deep)
        {
            XmlNode            cloneNode = base.CloneNode(deep);
            ConfigXmlAttribute clone     = cloneNode as ConfigXmlAttribute;

            if (clone != null)
            {
                clone._line     = _line;
                clone._filename = _filename;
            }
            return(cloneNode);
        }