14_dtd.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Report SYSTEM "report.dtd">
<Report>
    <Students>
        <Student StudId="s1">
            <Name>
                <First>John</First>
                <Last>Doe</Last>
            </Name>
            <Status>Enrolled</Status>
            <CrsTaken CrsCode="c1"/>
            <CrsTaken CrsCode="c2"/>
        </Student>
        <Student StudId="s2">
            <Name>
                <First>Jane</First>
                <Last>Smith</Last>
            </Name>
            <Status>Graduated</Status>
            <CrsTaken CrsCode="c1"/>
        </Student>
    </Students>
    <Classes>
        <Class>
            <Semester>Fall 2022</Semester>
            <ClassRoster Members="s1 s2"/>
        </Class>
    </Classes>
    <Courses>
        <Course CrsCode="c1">Computer Science</Course>
        <Course CrsCode="c2">Mathematics</Course>
    </Courses>
</Report>

<!-- The XML document references the DTD using the <!DOCTYPE ...> declaration.
The structure of the XML document follows the specified DTD elements and attributes.
The StudId attribute for the <Student> element, CrsCode attribute for the <Course> element, and CrsCode attribute for the <CrsTaken> element are defined as IDs or IDREFs in the DTD.
The Members attribute for the <ClassRoster> element is defined as IDREFS in the DTD.
This is a simple example, and in a real-world scenario, the XML document may contain more data and follow a more complex structure based on the specific requirements. -->