why is this invalid in xml?

Hi all,
probably not the best list to post it on, but I believe that there is quite
a lot of ppl able to answe.

I have the following:

<?xml version="1.0" encoding="UTF-8"?>
...
<prof>myyjä / eläkkeellä</prof>

...

and the "ä" is reported as being invalid? when I remove it the xml file is
OK so it is clearly problem of this particular letter. But I don't know
why.

br,

jakub


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