HL7® Austria FHIR® Core Implementation Guide
1.1.0 - STU2

Extension: SystemOID - Detailed Descriptions

Definitions for the at-core-ext-valueset-systemoid extension.

Guidance on how to interpret the contents of this table can be found here

0. Extension
Definition

HL7® Austria FHIR® Core Extension for the capturing of OID in ValueSets to reference the CodeSystem they come from. The extension is used to document the OID of the system of a code referenced in a ValueSet, to align FHIR with the HL7 Austria CDA document guidelines.

ShortSystem OID
Control0..*
Is Modifierfalse
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
2. Extension.id
Definition

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

ShortUnique id for inter-element referencing
Control0..1
This element is affected by the following invariants: ele-1
Typeid
Is Modifierfalse
XML FormatIn the XML format, this property is represented as an attribute.
Summaryfalse
4. Extension.extension
Definition

An Extension

ShortExtension
Control0..0
TypeExtension
Is Modifierfalse
Summaryfalse
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))
ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists())
SlicingThis element introduces a set of slices on Extension.extension. The slices are unordered and Open, and can be differentiated using the following discriminators:
  • value @ url
6. Extension.url
Definition

Source of the definition for the extension code - a logical name or a URL.

Shortidentifies the meaning of the extension
Comments

The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

Control1..1
Typeuri
Is Modifierfalse
XML FormatIn the XML format, this property is represented as an attribute.
Summaryfalse
Fixed Valuehttp://hl7.at/fhir/HL7ATCoreProfiles/5.0.0/StructureDefinition/at-core-ext-valueset-systemoid
8. Extension.value[x]
Definition

Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).

ShortValue of extension
Control1..1
This element is affected by the following invariants: ext-1
Typeoid
[x] NoteSee Choice of Data Types for further information about how to use [x]
Is Modifierfalse
Primitive ValueThis primitive element may be present, or absent, or replaced by an extension
Summaryfalse
Invariantsele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))