1. If you are able to use the Personal Edition, click here for version 5.3. Otherwise, you will need to use version 7+ of the XMLmind XML Editor. See http://www.xmlmind.com/xmleditor/
  2. Decompress and extract the installer in some directory.
  3. In a Terminal, do
    sudo ln -s Full_path_to_where_you_extracted_xxe/xxe-persoVersion_number /usr/local/bin/xxe
  4. You will also need to be sure and install a Java 6 package. The following works on at least some versions of Ubuntu:
    sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts