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<!ELEMENT libretti (libretto)*>
<!ELEMENT libretto (studente, esami)?>
<!ELEMENT studente (nome, cognome)>
<!ELEMENT nome (#PCDATA)>
<!ELEMENT cognome (#PCDATA)>
<!ATTLIST studente
cdl CDATA #REQUIRED
matricola CDATA #REQUIRED
>
<!ELEMENT esami (esame)+>
<!ELEMENT esame (materia, data, voto)>
<!ELEMENT materia (#PCDATA)>
<!ELEMENT data (#PCDATA)>
<!ELEMENT voto (#PCDATA)>
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