SQL & PL/SQL

I have a For Loop. I need to get the Assigned value to the Variable one at a time and create the XML as below.

FOR i IN varField.first .. varField.last LOOP

     varColumnField:=varField(i);

END LOOP;



  SELECT APPENDCHILDXML(Final_varXml, '/OBJECT/ReportViewer',(SELECT XMLELEMENT("ReportViewerReportViewDataFieldsList",

  XMLAGG(XMLELEMENT ("ReportViewerReportViewDataFields",
  XMLFOREST  (varColumnField AS "Name",
   2  AS "Type")
   )))
  FROM DUAL)) INTO varXml FROM DUAL;

Example Xml be Like this

<OBJECT>
<ReportViewer>
   <ReportViewerReportViewDataFieldsList>
   <ReportViewerReportViewDataFields>
   <Name>ColumnField1</Name>
   <Type>2</Type>
   </ReportViewerReportViewDataFields>
   <ReportViewerReportViewDataFields>
   <Name>ColumnField2</Name>
   <Type>2</Type>
   </ReportViewerReportViewDataFields>
   <ReportViewerReportViewDataFields>
   <Name>ColumnField3</Name>
   <Type>2</Type>
   </ReportViewerReportViewDataFields>
   </ReportViewerReportViewDataFieldsList>
</ReportViewer>

For Tag Value must Come from the Loop