Class Name: schedule_value
Description: Schedule value for a contiguous set of hours.
Parent: schedule_day
Number of Instances: 1...24
Sub_Elements:
Validation/Rules:
1. begin_hour must be 1 or 1+end_hour of previous schedule_value object.
2. end_hour must be greater than or equal to begin_hour.
3. All schedule_value objects of a single parent schedule_day object must specify a complete 24 hours.
Validation/Rules:
Notes: