/// <summary>
        /// <para>From DMTF Spec:</para>This operation is used to modify an existing CIM Instance in the target Namespace. The Instance MUST already exist.
        /// </summary>
        /// <param name="settings"></param>
        /// <param name="defaultNamespace"></param>
        /// <returns>The CimXml request as a string.</returns>
        public static void ModifyInstance(CimXmlWriter cxw, ModifyInstanceOpSettings settings, CimName defaultNamespace)
        {
            #region Actual XML Request
            /*
            */
            #endregion

            // Set the Method Name
            cxw.WriteIMethodCallStartElement("ModifyInstance");

            // Set the namespace
            cxw.WriteCimNamespace(defaultNamespace);

            //<IPARAMVALUE NAME="ModifiedInstance">
            cxw.WriteIParameterElement();
            cxw.WriteCimNameAttributeString("ModifiedInstance");
            cxw.WriteCimInstance(settings.ModifiedInstance);

            //</IPARAMVALUE>
            cxw.WriteEndElement();

            cxw.WriteIncludeQualifiers(settings.IncludeQualifiers);

            cxw.WritePropertyList(settings.PropertyList);

            //</IMETHODCALL>
            cxw.WriteEndElement();
        }