SQL/XML ... beginner's question ...

Hi Everyone,
I would like to output to XML and Oracle seems to have all the tools that I need, starting with XMLElement. However, I am having some trouble getting off the ground here.
I wanted to test with a small table thus ...
SELECT XMLElement("PCL",PCL) AS "RESULT"
FROM DWH_T_TM_KONSTANTE
... and although the correct number of rows is returned there was no data displayed (in SQL*Plus).
I then tried the following ...
SELECT XMLElement("mydate",SYSDATE) AS "RESULT"
FROM DUAL
... but also received one row returned but no data / no XML.
So my question here is what am I doing wrong?
There were no error messages, just no data displayed.
Do I maybe need to activate 'XML' on our server? We are using Oracle 10g, release 10.2.0.3.0.
I am sure that it is a simple thing and so would be grateful for any help that you can give.
Regards,
Alan Searle
Cologne, Germany

Just a quick supplement to my question ...
I tried ...
SELECT XMLCOMMENT('mycomment') AS "XMLCOMMENT"
FROM dual;
... and got a correct, parsed result ...
XMLCOMMENT
<!--mycomment-->
So XML functionality must be working.
However, XMLELEMENT somehow seems to be correctly selecting the data (correct number of rows returned) but is not displaying any output.
This must be such a simple thing but I can't work out what I am doing wrong.
Regards,
Alan

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