Instance Identifier (II)
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Instance Identifier (II)
This data type identifies instances of classes like observations or entities (persons, or-ganizations). Attributes are
Attribute | DT | Conf | Description |
---|---|---|---|
@extension | st | O | Identification |
@root | uid | R | Source of identification |
<id extension="13234453645" root="2.16.840.1.113883.2.6.15.3.427.1"/>
The @root
attribute is of type OID (object identifier), a unique identifier of the issuing authority or system. For example, a patient with a patient number 13234453645 creat-ed by a specific healthcare provider organization is uniquely identified by the number itself in @extension
and the OID of the organization or the sending system, in the example 2.16.840.1.113883.2.6.15.3.427.1 in @root
.
In some cases a single OID identifies an object uniquely. In that situation, only @root is populated and @extension is omitted.