<!ELEMENT listeClasse (classe)* >
<!ELEMENT classe (matiere)* >
<!ELEMENT matiere (nom, coeff, note*) >
<!ELEMENT nom (#PCDATA) >
<!ELEMENT coeff (#PCDATA) >
<!ELEMENT note (#PCDATA) >


<!ATTLIST classe id ID #REQUIRED >
<!ATTLIST note eleve CDATA #REQUIRED >