Blank Tag in XML

Question

Hi,
I am using DBMS_XMLQuery package to generate XML (I am new to this feature)
The problem is, in the generated XML file, some tags are missing if there is no data. But my requirement is to print the tag even if there is no data for that column.
i.e., i am getting the following outputs
(With data)
<?xml version='1.0'>
<rowtag>
<col1>data1</col1>
<col2>data2</col2>
</rowtag>
(Without data in col2)
<?xml version='1.0'>
<rowtag>
<col1>data3</col1>
</rowtag>
(Expected output without data)
<?xml version='1.0'>
<rowtag>
<col1>data3</col1>
<col2></col2>
</rowtag>
Hope I didnt confused you
Any help will be appreciated
Regards,
Krrish

Answer 1

Or don't use dbms_xml at all:
SQL>  with t as
  select 'data1' col1, 'data2' col2 from dual union all
  select 'data3' col1,  null   col2 from dual
select xmlserialize(content xmlelement ("rowtag",
                   xmlelement ("col1", col1),
                   xmlelement ("col2", col2)
                  ) indent) xml
  from t
XML                                                                            
<rowtag>                                                                       
  <col1>data1</col1>                                                           
  <col2>data2</col2>                                                           
</rowtag>                                                                      
<rowtag>                                                                       
  <col1>data3</col1>                                                           
  <col2/>                                                                      
</rowtag> /* xmlserialize is just used for nicer formatting */