Period

Period represents two dates with a start and finish.

Schema ID

https://gobl.org/draft-0/cal/period

Title	Property	Type	Req.	Description
Label	`label`	string		Label is a short description of the period.
Start	`start`	cal.Date	true	Start indicates when this period starts.
End	`end`	cal.Date	true	End indicates when the period ends, and must be after the start date.

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