Hello, Jan Schneider schrieb: > " is a valid xml entity, not. So, the answer to my question is not in the Horde documentation, but rather in <http://www.w3.org/TR/2004/REC-xml11-20040204/#sec-predefined-ent> and <http://www.w3.org/TR/2004/REC-xml11-20040204/#dt-charref>. Thanks for the hint. Best wishes, Otto Stolz