problem writing unicode data to xml file

[Kaustubh S. Deorukhkar]

 
Hi,
  I am facing issues writing unicode data to xml file in UTF8 encoding. Application can write most of the unicode chars, but for some chars as mentioned below the data is garbled. The sample data contains following characters
ï¿®     (Unicode 0xffee)
鷗     (Unicode 0x9dd7)

I am using XMLString::transcode before adding the node to DOM tree and then writing to file. Using xerces verion 2.5. Has anybody faced such problem. Any pointers would be very helpful.
Thanks in advance.
Kaustubh