The fourth section uses XML

Extensible Markup Language XML, which is a platform-independent data representation format, has some advantages over the relational format for data representing the needs of specific data.

An XML document can be a physical file on a computer, a stream of data on a network, or just a string in memory. However, the XML document itself must be complete and well-formed. Even if there is no pattern, it must obey certain rules.

The Web. config file is an XML text file that is used to store configuration information for an ASP.

<?XML version= "1.0"?><Configuration>    <system.web>    <customErrorsdefaultredirect= "~/default.aspx"Mode= "Off"/>        <HttpRuntimeRequestvalidationmode= "2.0"executiontimeout= "$"maxRequestLength= "52428800"useFullyQualifiedRedirectUrl= "false" />    <pagesvalidaterequest= "false"/>    <compilationtargetframework= "4.0"Debug= "true"></compilation>    
    <httphandlers>      <AddPath= "Action.ashx"verb="*"Validate= "false"type= "UI. Action.action "/>      <AddPath= "Logout.ashx"verb="*"Validate= "false"type= "UI. Action.logout "/>      <AddPath= "Verificationcode.ashx"verb="*"Validate= "false"type= "UI. Action.verificationcodeaction "/>    </httphandlers>
  </system.web>    <connectionStrings>    <Addname= "HYD." EMS "connectionString= "Data source=192.168.3.11\dev;timeout=210;initial catalog=appsale; User Id=sa; password=123456 "/>  </connectionStrings>      <appSettings>        <AddKey= "Email"value= "[email protected]" />    <AddKey= "Emailpassword"value= "123456" />    <AddKey= "SMTP"value= "Smtp.qq.com" />  </appSettings>    <system.webserver>    <handlers>      <AddPath= "Action.ashx"name= "Emsaction"verb="*"type= "UI. Action.action "/>      <AddPath= "Logout.ashx"name= "Emslogout"verb="*"type= "UI. Action.logout "/>      <AddPath= "Verificationcode.ashx"name= "Emsverificationcode"verb="*"type= "UI. Action.verificationcodeaction "/>      <AddPath= "Params.ashx"name= "Emsparams"verb="*"type= "UI. Action.params "/>    </handlers>    <Validationvalidateintegratedmodeconfiguration= "false"/>  </system.webserver>    <System.ServiceModel>    <Bindings/>    <Client/>  </System.ServiceModel></Configuration>

The fourth section uses XML