curs.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE curs [
<!ELEMENT curs (disciplina, facultate, tutor)>
<!ELEMENT disciplina (#PCDATA)>
<!ELEMENT facultate (#PCDATA)>
<!ENTITY facultate SYSTEM "facultate.xml">
<!ELEMENT tutor (nume, imagine)>
<!ELEMENT nume (#PCDATA)>
<!ELEMENT imagine EMPTY>
<!ATTLIST imagine sursa ENTITY #REQUIRED>
<!ENTITY img SYSTEM "https://virtualcampus.ro/img/author/MarianBucos.jpg" NDATA jpg>
<!NOTATION jpg SYSTEM "image/jpeg">
]>
<curs>
    <disciplina>Modele de date avansate</disciplina>
    &facultate;
    <tutor>
        <nume>Virgil Popescu</nume>
        <imagine sursa="img" />
    </tutor>
</curs>