Datum

Extends: 
Version: 
0
Is Abstract: 
no
Is Pattern: 
no
Definition: 

A Datum is a designation (a representation of a concept by a sign) with a notion of equality defined. The sign itself is a perceivable object.

Explanatory Notes: 

From GSIM 1.1 "A Datum is the actual instance of data that was collected or derived. It is the value which populates one or more Data Points. A Datum is the value found in a cell of a table." (https://statswiki.unece.org/display/GSIMclick/Datum ) A Datum could be copied to one or more datasets.
DDI4 takes a little more formal (semiotic) description of a Datum using the Signification Pattern. See the attached example.

NOTE: This is NOT datum from DDI3.2 (which is quite specific).

Example: 
A systolic blood pressure of 122 is measured. The Signifier for that measurement in this paragraph is the character string "122". The Datum in this case is a kind of Designation (Sign), which is the association of the underlying measured concept (a blood pressure at that level) with that Signifier. The Datum has an association with an InstanceVariable which allows the attachment of a unit of measurement (mm Hg), a datatype, a Population, and the Act which produced the measurement. These InstanceVariable attributes are critical for interpreting the Signifier.
Property: 
NameCardinalityDatatypeDescription
representation
1..1
Specification of the type of Signification
Relationship: 
NameTarget ObjectDescriptionSource cardinalityTarget cardinalityRelationship type
isBoundedBy
A Datum is bounded by an InstanceVariable. The Datum is drawn from a set of values, either substantive or sentinel described by the value domain of the InstanceVariable
0..n
0..1
Neither
Is extendable: 
GSIM: 
Datum
Is property: 
0
RDF Mapping: 

Comments

name is inherited from the AnnotatedIdentifiable extension base of ValueDomain
description is inherited from extension base ValueDomain