validations errors

[admin]

Dear ALL XMLers.........

am a new student in xml and would like to get some help in this exercice if possible :

what are the 5 validations errors in the following document?

<?xml version="1.0" encoding="ISO-8859-1" standalone="yes"?>
<!DOCTYPE universit?[
<!ELEMENT universit?(facult?)>
<!ELEMENT facult?(d閜artement*)>
<!ELEMENT d閜artement EMPTY>
]>
<universit?gt;
<facult?nom="sciences">
<d閜artement nom="math閙atiques">
</d閜artement>
<d閜artement nom="sociologie">
</d閜artement>
</facult?gt;
</universit?gt;

i really count on your help!!!
Thanks alot...i will apreciate it