<!ELEMENT classlist (site+,department*,student*) >

<!ELEMENT site (#PCDATA) >
<!ATTLIST site code (R|G) #REQUIRED >
<!ELEMENT department (#PCDATA) >
<!ELEMENT student (#PCDATA) >

<!ELEMENT  department ((name|office|phone|chair)*)>
<!ATTLIST department id (CA|CS|IS) #REQUIRED >
<!ATTLIST department campus (R|G) #REQUIRED >

<!ELEMENT  name  (#PCDATA) >
<!ELEMENT  office   (#PCDATA) >
<!ELEMENT  phone  (CDATA) >
<!ELEMENT  chair   (#PCDATA) >

<!ELEMENT  student ((PCDATA|ssn|phone|grades)*)>
<!ATTLIST student id (1|2|3|4|5|6|7) #REQUIRED >
<!ATTLIST student major (CA|CS|IS) #REQUIRED >
<!ATTLIST student campus (PCDATA) #REQUIRED >

<!ELEMENT  name  (salutation?,first+,last+) >
<!ATTLIST name gender (M|F) #REQUIRED >
<!ELEMENT  salutation (#PCDATA) >
<!ELEMENT  first  (#PCDATA) >
<!ELEMENT  last  (#PCDATA) >

<!ELEMENT  ssn   (CDATA) >
<!ELEMENT  phone  (CDATA) >

<!ELEMENT  grades   ((midterm|project|final|average|lettergrade)+)>
<!ELEMENT  midterm (CDATA) >
<!ELEMENT  project  (#PCDATA) >
<!ELEMENT  final  (CDATA) >
<!ELEMENT  average (CDATA) >
<!ELEMENT  lettergrade  (#PCDATA) >