Jackrabbit cannot store xml file

[Xiaojie Shen]

Hello
Is it a known issue that jackrabbit cannot save xml file? The file content is 
empty if I store .xml file. If the file extension is changed to .txt and remove 
the first row "<?xml version="1.0" encoding="ISO-8859-1"?>", jackrabbit saves 
the file content.
BR
Xiaojie