parsing xml file with expat library in C

i have searched for how to parse xml file using expat library , but found nothing useful for a beginner all what i want is to read the three numbers 6, 7 and 8 from a configuration file. anyone could help me ,please ?!

  <?xml version="1.0" encoding="UTF-8"?>
<Configuration>
    <board_height> 6 </board_height>
    <board_width> 7 </board_width>
    <maximum_highscores> 8 </maximum_highscores>    
</Configuration>