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AttributeSchema Datatype or EnumerationUsageDefinitionBusiness Rules
TypetextRequired

Categorization of external resources. 

Examples include: "ODM", "HL7-FHIR", "HL7-CDA", "HL7-v2", "OpenEHR-extract"

Extensible controlled terminology may be developed and published in the  future.
NametextnameRequired

The human readable identifier of the element or field in the external resource.

Examples include : "ItemGroupDef" (for Type="ODM"), "Observation" (for Type="HL7-FHIR"), "substanceAdministration.doseQuantity" (for Type="HL7-CDA"), "OBX-5" (for field 5 ("Observation Result") for Type="HL7-v2").

The value must be an existing element name or field name for the specific document or message type provided in the Type attribute.
AttributetextnameOptional

Field provided by the Name attribute where the data or information can be obtained.

Examples are "valueQuantity.value" or "valueQuantity.unit" for the case of an HL7-FHIR "Observation", "Repeating" for the case of an ODM ItemGroupDef element, "unit" for the case of an HL7-CDA doseQuantity, "Code" or "Name" for the case of field 5 (which is composite) of an HL7-v2 OBX message.

The Name and Attribute attributes are are meant to provide traceability documentation.

The Selection child element is meant to provide  machine-executable instructions for extracting the information from the resource. 

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