[TYPO3-calendar] Invalid Cal RSS XML when Title contains &

[Dr. Christoph Hermann]

Hi,

the typo3 cal extension creates an invalid RSS Feed when the title field of 
an event contains an & (ampersand).

This is especially weird since the typoscript contains a htmlspecialchars in 
the event stdWrap.

There is a function getRssFromEvent in the source that is never called that 
seems to adress the problem?
But since it's never called it doesn't work ;-)

In Line 122 i patched the code with a function fixXML that does a regex 
replace, but this is of course not a valid solution to the problem.

$subpartArray['###CONTENT###'] .= $this->fixXML($event-
>renderEventFor('rss'));

i tracked down the event->renderEventFor to the getMarker in 
model/class.tx_cal_base_model.php.

I assume there should be a way to specify a getTitleMarker() function in the 
RSS class to correctly adress this issue.

What would be the correct way to adress this issue?
Can someone comment on this?

regards
Christoph Hermann