This is a sample MathBook XML document to demonstrate and test different fonts used for different languages. For PDF output, and best results, process with xelatex (or lualatex, unsupported). If processed with pdflatex, be prepared for errors, and maybe try running with the command-line option -interaction batchmode or -interaction nonstopmode. Commentary here, and in the original source file, should help you track down what might be missing in your system if the xelatex results are not satisfactory. You can also compare PDF output with the HTML output, which should work well for many different characters tested here.
<?xml version="1.0" encoding="UTF-8" ?>