Character Encoding
From Documentation
This documentation is for an older version of ZK. For the latest one, please click here.
It is, though optional, a good idea to specify the encoding in your XML such that the XML parser can interpret it correctly. Note: it must be on the first line of the file.
<?xml version="1.0" encoding="UTF-8"?>
In addition to specify the correct encoding, you have to make sure your XML editor supports it as well.