XMLBase64 into cdata section

[Mike Ellery]

I'm encoding some data using Base64::encode, which returns me XMLByte*. 
 Now I want to create a CDATA section using the encoded bytes - the 
document's createCDATASection method takes XMLCh*.  How do I get to here 
from there?  Do I need to use XMLString::transcode to get XMLCh?

Apologies if this is covered in the docs - I couldn't find it.
-Mike Ellery