Extensions for Using Data Elements from FHIR DSTU2 in FHIR R5
0.1.0 - STU
Extensions for Using Data Elements from FHIR DSTU2 in FHIR R5
0.1.0 - STU
Extensions for Using Data Elements from FHIR DSTU2 in FHIR R5 - Downloaded Version null See the Directory of published versions
| Page standards status: Trial-use | Maturity Level: 0 |
Definitions for the ext-R2-Conformance.acceptUnknown extension.
Guidance on how to interpret the contents of this table can be foundhere
| 0. Extension | |
| Definition | DSTU2: Optional Extension Element - found in all resources. |
| Short | DSTU2: no | extensions | elements | both (new)Optional Extensions Element |
| Comments | Element |
| Control | 10..1* |
| Is Modifier | false |
| Invariants | ele-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())ele-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.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies 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. |
| Control | 1..1 |
| Type | uri |
| Is Modifier | false |
| XML Format | In the XML format, this property is represented as an attribute. |
| Summary | false |
| Fixed Value | http://hl7.org/fhir/1.0/StructureDefinition/extension-Conformance.acceptUnknown |
| 4. Extension.value[x] | |
| Definition | A code that indicates whether the application accepts unknown elements or extensions when reading resources. Value of extension - must be one of a constrained set of the data types (see Extensibility for a list). |
| Short | no | extensions | elements | bothValue of extension |
| Comments | Unknown elements in a resource can only arise as later versions of the specification are published, because this is the only place where such elements can be defined. Hence accepting unknown elements is about inter-version compatibility. Applications are recommended to accept unknown extensions and elements ('both'), but this is not always possible. |
| Control | 10..1 This element is affected by the following invariants: ext-1 |
| Binding | The codes SHALL be taken from For codes, see R2UnknownContentCodeForR5 (0.1.0) (required to http://hl7.org/fhir/uv/xver/ValueSet/R2-unknown-content-code-for-R5|0.1.0)A code that indicates whether an application accepts unknown elements or extensions when reading resources. |
| Type | code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| Is Modifier | false |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| Summary | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count()))ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) |
Guidance on how to interpret the contents of this table can be foundhere
| 0. Extension | |
| Definition | DSTU2: |
| Short | DSTU2: no | extensions | elements | both (new) |
| Comments | Element |
| Control | 1..1 |
| Is Modifier | false |
| 2. Extension.url | |
| Control | 1..1 |
| Fixed Value | http://hl7.org/fhir/1.0/StructureDefinition/extension-Conformance.acceptUnknown |
| 4. Extension.value[x] | |
| Definition | A code that indicates whether the application accepts unknown elements or extensions when reading resources. |
| Short | no | extensions | elements | both |
| Comments | Unknown elements in a resource can only arise as later versions of the specification are published, because this is the only place where such elements can be defined. Hence accepting unknown elements is about inter-version compatibility. Applications are recommended to accept unknown extensions and elements ('both'), but this is not always possible. |
| Control | 1..1 |
| Binding | The codes SHALL be taken from R2UnknownContentCodeForR5 (0.1.0) (required to http://hl7.org/fhir/uv/xver/ValueSet/R2-unknown-content-code-for-R5|0.1.0)A code that indicates whether an application accepts unknown elements or extensions when reading resources. |
| Type | code, date, Meta, Address, Attachment, integer, Count, DataRequirement, Dosage, uuid, Identifier, RatioRange, Coding, SampledData, id, positiveInt, Distance, Availability, integer64, Period, Duration, canonical, Range, RelatedArtifact, base64Binary, UsageContext, Timing, decimal, ExtendedContactDetail, CodeableConcept, ParameterDefinition, dateTime, string, oid, instant, ContactPoint, HumanName, Money, markdown, Ratio, Age, Reference, TriggerDefinition, Quantity, uri, url, Annotation, ContactDetail, boolean, Expression, CodeableReference, Signature, unsignedInt, time |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
Guidance on how to interpret the contents of this table can be foundhere
| 0. Extension | |
| Definition | DSTU2: |
| Short | DSTU2: no | extensions | elements | both (new) |
| Comments | Element |
| Control | 1..1 |
| Is Modifier | false |
| Invariants | ele-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. |
| Short | Unique id for inter-element referencing |
| Control | 0..1 This element is affected by the following invariants: ele-1 |
| Type | id |
| Is Modifier | false |
| XML Format | In the XML format, this property is represented as an attribute. |
| Summary | false |
| 4. Extension.extension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and managable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| Short | Additional content defined by implementations |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Is Modifier | false |
| Summary | false |
| Alternate Names | extensions, user content |
| Invariants | ele-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()) |
| Slicing | This element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 6. Extension.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies 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. |
| Control | 1..1 |
| Type | uri |
| Is Modifier | false |
| XML Format | In the XML format, this property is represented as an attribute. |
| Summary | false |
| Fixed Value | http://hl7.org/fhir/1.0/StructureDefinition/extension-Conformance.acceptUnknown |
| 8. Extension.value[x] | |
| Definition | A code that indicates whether the application accepts unknown elements or extensions when reading resources. |
| Short | no | extensions | elements | both |
| Comments | Unknown elements in a resource can only arise as later versions of the specification are published, because this is the only place where such elements can be defined. Hence accepting unknown elements is about inter-version compatibility. Applications are recommended to accept unknown extensions and elements ('both'), but this is not always possible. |
| Control | 1..1 This element is affected by the following invariants: ext-1 |
| Binding | The codes SHALL be taken from R2UnknownContentCodeForR5 (0.1.0) (required to http://hl7.org/fhir/uv/xver/ValueSet/R2-unknown-content-code-for-R5|0.1.0)A code that indicates whether an application accepts unknown elements or extensions when reading resources. |
| Type | code |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| Is Modifier | false |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| Summary | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() or (children().count() > id.count())) |
IG © 2025+ FHIR Infrastructure. Package hl7.fhir.uv.xver-r2.r5#0.1.0 based on FHIR 5.0.0. Generated 2026-03-20
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