student.dtd.xml

<?xml	version="1.0"?>	
<!DOCTYPE student[
<!ELEMENT student (firstname,lastname,id,plan)>
<!ELEMENT firstname (#PCDATA)>
<!ELEMENT lastname (#PCDATA)>
<!ELEMENT id (#PCDATA)>
<!ELEMENT plan (courses+)>
<!ELEMENT courses (course*)>
<!ATTLIST courses year CDATA #REQUIRED>
<!ELEMENT course (name,shortname,record?)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT shortname (#PCDATA)>
<!ELEMENT record (grade,date)>
<!ELEMENT grade (#PCDATA)>
<!ELEMENT date (#PCDATA)>
]>