[me:]

It was a joke (as indicated by the smiley).

(And also was intended as a gentle reminder of what Gordon had already said --
this question is about XML and is /totally/ off-topic for this newsgroup.  Ask
an irrelevant question and you'll get an irrelevant answer.)

BTW, you seem to have fallen into the habit of posting whatever simple
questions occur to you here.  There's nothing wrong with asking questions
(provided they are on-topic), and you are still getting answers to them, but I
suspect that you are starting to wear out people's patience by overdoing it.
If you do (and you have exhausted mine) then people will stop being helpful --
even if you come up against a problem that /isn't/ trivially simple.   You
would be well advised to make more use of other resources (your teachers
perhaps ?), and learn to use Google or some other seach engine.  For example
typing:
   what is PCDATA
into Google would have produced several good explanations (try it, and you'll
see what I mean).

   -- chris