Restructure the document in Figure 15.4, so as to completely replace the elements Name, Status, CrsCode, Semester,andCrsName with attributes in the appropriate tags. Provide a DTD suitable for this document. Specify all applicable ID and IDREF constraints.

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The Student elements would now look as follows:








The Class elements will now have the following form:






The Course elements would now look as follows:




The corresponding DTDs will therefore be:











Name CDATA #REQUIRED
Status CDATA #REQUIRED>
Semester CDATA #REQUIRED>
CrsName CDATA #REQUIRED>
Semester CDATA #REQUIRED>

]>

Computer Science & Information Technology

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