DDEX Data Dictionary , 2010-06-18

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Time

A point or portion of linear time.

Comments	Time: Format In DDEX times (including xs:dates) are expressed in an ISO 8601:2004 compliant format.
	Time: Scope A Time is a primitive Entity which depends on the concept of "linear" time (defined in the Oxford English Dictionary as "The indefinite continued progress of existence, events, etc., in past, present and future").
Relationships
Parents	Entity	Something that may be represented by a Name.
Children	Period	A Time represented as a range between two other Times (with measurable Duration, as opposed to a point in Time).
	PeriodEnd	A Time which marks the end of a Period.
	PeriodStart	A Time which marks the beginning of a Period.

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