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MBA IT, Mater in Science and Technology
Devry
Jul-1996 - Jul-2000
Professor
Devry University
Mar-2010 - Oct-2016
can anyone explain this example for me , pleaseee
nUniversity DTD with ID and IDREF attribute types.
<!DOCTYPEÂ university-3[
    <!ELEMENT university ( (department|course|instructor)+)>
    <!ELEMENT department ( building,budget )>
    <!ATTLIST department
           dept_nameID #REQUIRED >
    <!ELEMENT course (title, credits)>
    <!ATTLIST course
           course_idID #REQUIRED
           dept_nameIDREF #REQUIRED
           instructors IDREFS #IMPLIED>
    <!ELEMENT instructor ( name,salary )>
    <!ATTLISTinstructor
           IID ID #REQUIREDÂ
           dept_nameIDREF #REQUIRED >
    · · · declarations for title,credits, building,
           budget, name and salary · ··
]>
thanks alot.
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