View source for Category:E52-Time-Span

This category corresponds to the class [[imported from:=cidoc:E52.Time-Span]] of the [http://www.cidoc-crm.org/ CIDOC CRM] vocabulary, (see [[MediaWiki:Smw import cidoc]]).

This class comprises abstract temporal extents, in the sense of Galilean physics, having a beginning, an end and a duration. 
Time Span has no other semantic connotations. Time-Spans are used to define the temporal extent of instances of E4 Period, E5 Event and any other phenomena valid for a certain time. An E52 Time-Span may be identified by one or more instances of E49 Time Appellation. 
Since our knowledge of history is imperfect, instances of E52 Time-Span can best be considered as approximations of the actual Time-Spans of temporal entities. The properties of E52 Time-Span are intended to allow these approximations to be expressed precisely.  An extreme case of approximation, might, for example, define an E52 Time-Span having unknown beginning, end and duration. Used as a common E52 Time-Span for two events, it would nevertheless define them as being simultaneous, even if nothing else was known. 
	Automatic processing and querying of instances of E52 Time-Span is facilitated if data can be parsed into an E61 Time Primitive.

[[Category:E1-CRM_Entity]]