Date Schema - Proposed Revisions

Schema

Information Group	Information Unit	Definition	Field Type	Repeatable
Date information	Display date (date text)	The textual expression of the date or date span when an event in an object's history is thought to have occurred.	Text or Auto-generate	No

	Date - association	How a date relates to an event in an object's history.	Controlled list or Subject authority	No

	Date - earliest/single year	The earliest probable or exact year at which an event in an object's history is thought to have occurred.	Number	No
	> Date - earliest/single month	The earliest probable or exact month at which an event in an object's history is thought to have occurred.	Number	No
	> Date - earliest/single day	The earliest probable or exact month at which an event in an object's history is thought to have occurred.	Number	No
	> Date - earliest/single era	The era during which an event in an object's history is thought to have occurred.	Controlled list	No
	> Date - earliest/single certainty	A term describing the extent to which the Date - earliest/single recorded is thought to be correct.	Controlled list	No
	> Date - earliest/single qualifier	A qualification of the earliest probable or exact date at which an event in an object's history is thought to have occurred.	Controlled list	No
	> Date - earliest/single qualifier value	The value of the qualification of the earliest probable or exact date at which an event in an object's history is thought to have occurred.	Number	No
	> Date - earliest/single qualifier unit	The unit of the qualification of the earliest probable or exact date at which an event in an object's history is thought to have occurred.	Controlled list	No

	Date - latest year	The latest probable year at which an event in an object's history is thought to have occurred.	Number	No
	> Date - latest month	The latest probable month at which an event in an object's history is thought to have occurred.	Number	No
	> Date - latest day	The latest probable day at which an event in an object's history is thought to have occurred.	Number	No
	> Date - latest era	The latest probably era during which an event in an object's history is thought to have occurred.	Controlled list	No
	> Date - latest certainty	A term describing the extent to which the Date - latest recorded is thought to be correct.	Controlled list	No
	> Date - latest qualifier	A qualification of the latest probable date at which an event in the object's history is thought to have occurred.	Controlled list	No
	> Date - latest qualifier value	The value of the qualification of the latest probable date at which an event in the object's history is thought to have occurred.	Number	No
	> Date - latest qualifier unit	The unit of the qualification of the latest probable date at which an event in the object's history is thought to have occurred.	Controlled list	No

	Date - period	A textual expression of the period when an event in an object's history is thought to have occurred.	Subject authority	No

	Date note	Additional information about the date which has not been recorded elsewhere using controlled terminology.	Text	No

Notes

Controlled list contents

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Field	Value(s)	Default Value
Date - Association	specific to procedure	none
Date - earliest/single era	BCE; CE	CE
Date - latest era	BCE; CE	CE
Date - Certainty	after; approximate; before; circa; probably; possibly	none
Date - Qualifier	+, -, +/-	none
Date - Qualifier unit	day(s), month(s), year(s)	none