DTD Type Definition

<!DOCTYPE exam[
  <!ELEMENT exam (student,qapair*)>
    <!ATTLIST exam paper CDATA #REQUIRED>
  <!ELEMENT student (#PCDATA)>
  <!ELEMENT qapair (question,answer)>
    <!ATTLIST qapair number CDATA #REQUIRED>
  <!ELEMENT question (#PCDATA)>
  <!ELEMENT answer (#PCDATA)>
]>

• Root element is <exam>
• Contains a <student> element followed by <qapair>-s
• <qapair> consists of a <question> followed by an <answer>
• <exam> element has an attribute paper
• <qapair> element has an attribute number