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- <!ELEMENT Course_Catalog (Department*)>
- <!ELEMENT Department (Title, Course*, (Professor|Lecturer)*)>
- <!ELEMENT Course (Title, Description?)>
- <!ELEMENT Title (#PCDATA)>
- <!ELEMENT Description (#PCDATA|Courseref)*>
- <!ELEMENT Courseref EMPTY>
- <!ELEMENT Professor (First_Name, Middle_Initial?, Last_Name)>
- <!ELEMENT First_Name (#PCDATA)>
- <!ELEMENT Middle_Initial (#PCDATA)>
- <!ELEMENT Last_Name (#PCDATA)>
- <!ELEMENT Lecturer (First_Name, Middle_Initial?, Last_Name)>
- <!ELEMENT Prerequisites (Prereq+)>
- <!ELEMENT Prereq (#PCDATA)>
- <!ATTLIST Department Code CDATA #REQUIRED>
- <!ATTLIST Department Chair IDREF #REQUIRED>
- <!ATTLIST Course Number ID #REQUIRED>
- <!ATTLIST Course Prerequisites IDREFS #IMPLIED>
- <!ATTLIST Course Instructors IDREFS #IMPLIED>
- <!ATTLIST Course Enrollment CDATA #IMPLIED>
- <!ATTLIST Professor InstrID ID #REQUIRED>
- <!ATTLIST Lecturer InstrID ID #REQUIRED>
- <!ATTLIST Courseref Number IDREF #REQUIRED>
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