internal void Fill(WmXmlPackage wmXmlPackage)
        {
            if (null == wmXmlPackage)
            {
                throw new ArgumentNullException(nameof(wmXmlPackage));
            }

            ContractId = wmXmlPackage.SelectInt32("@contractid");
            WmId       = wmXmlPackage.SelectWmId("@wmid");
            AcceptTime = wmXmlPackage.SelectWmDateTimeIfExists("@acceptdate");
        }