public static CellConditionsDescriptor Deserialize(String str)
        {
            if (!String.IsNullOrEmpty(str))
            {
                StringReader str_reader = new StringReader(str);
                XmlReader    reader     = XmlReader.Create(str_reader);

                return(CellConditionsDescriptor.Deserialize(reader));
            }
            else
            {
                return(null);
            }
        }