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Timetable information i.e. "Day 1 Period 1"

Timetable information i.e. "Day 1 Period 1"

I'm exploring how to use OneRoster to be able to specify scheduling information (timetable) with each class. The class entity has a periods attribute that can be a comma-delineated string. This is described as the periods in which this class meets.

What I'm confused by is that the data model does not include days? Scheduling information includes which day, and which period, so how to do that here? For example, it meets on Day 1 Period 1, Day 3 Period 5, …. How to do this with OneRoster?

I suppose I could use something like "D1P1","D3P5" in the string, but is there a conventional way to do this?