Ampersand in XWiki news disables RSS feeds because of invalid XML syntax

I added a news entry and used an ampersand character in the caption. Example: New news about this & that.

Now the RSS feed gives me this error (because the XML-Validator thinks of &that as an entity without closing :

Here is what IE says:

<rdf:li rdf:resource="http://192.168.111.31/xwiki/bin/view/Main/Newnewsaboutthis&that" />
------------------...

Thats from Firefox:

XML-Verarbeitungsfehler: nicht wohlgeformt (not well formed)
Adresse: http://192.168.111.31:8080/xwiki/bin/view/Main/BlogRss?xpage=rdf
Zeile Nr. 21, Spalte 91:<rdf:li rdf:resource="http://192.168.111.31/xwiki/bin/view/Main/Newnewsaboutthis&that" />
------------------------------------------------------------------------------------------^

This can be resolved by deleting all documents/news containing the ampersand. The RSS XML will then be valid again.