, , , -. -, , ERM. , .. ( ). , -, . 4.12, (. 4.14).
() :
1. . ( ), ( ), . , .
2. -. , , , -.
, . . N , N*(N-1) , . .
. 4.14.
, , . 4.15 4.17.
. 4.15 -. Student Schedule , , . , , . Schedule CourseOffering , ( ) ( ). Student; FulltimeStudent: ( ) ParttimeStudent ( ).
. 4.15. -
. 4.16 -, Schedule CourseOffering. , , (status), , , . , (grade). , - PrimaryScheduleOfferingInfo - ScheduleOfferingInfo ( , , , ) ( ), .
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ScheduleOfferingInfo
. 4.16. -
. 4.17 ( ). , - () , ( ). , ( ) .
. 4.17. ( )