# Feature - FHIR Application Feature Framework Implementation Guide v1.0.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **Feature**

## Extension: Feature 

| | | |
| :--- | :--- | :--- |
| *Official URL*:http://hl7.org/fhir/uv/application-feature/StructureDefinition/feature | *Version*:1.0.0 | |
| * Standards status: *[Trial-use](http://hl7.org/fhir/R5/versions.html#std-process) | [Maturity Level](http://hl7.org/fhir/versions.html#maturity): 2 | *Computable Name*:Feature |

This extension documents the features of a system using code/value pairs

**Context of Use**

**Usage info**

**Usages:**

* Use this Extension: [Feature Capability Statement](StructureDefinition-FeatureCapabilityStatement.md)
* Examples for this Extension: [FeatureCapabilityStatementExample](CapabilityStatement-FeatureCapabilityStatementExample.md)

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/resource/hl7.fhir.uv.application-feature|current/StructureDefinition/StructureDefinition-feature.json)

### Formal Views of Extension Content

 [Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work](http://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#structure-definitions). 

 

Other representations of profile: [CSV](StructureDefinition-feature.csv), [Excel](StructureDefinition-feature.xlsx), [Schematron](StructureDefinition-feature.sch) 

#### Constraints



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "feature",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics",
    "valueCode" : "can-bind"
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "fhir"
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 2,
    "_valueInteger" : {
      "extension" : [{
        "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
        "valueCanonical" : "http://hl7.org/fhir/uv/application-feature/ImplementationGuide/hl7.fhir.uv.application-feature"
      }]
    }
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode" : "trial-use",
    "_valueCode" : {
      "extension" : [{
        "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
        "valueCanonical" : "http://hl7.org/fhir/uv/application-feature/ImplementationGuide/hl7.fhir.uv.application-feature"
      }]
    }
  }],
  "url" : "http://hl7.org/fhir/uv/application-feature/StructureDefinition/feature",
  "version" : "1.0.0",
  "name" : "Feature",
  "status" : "active",
  "date" : "2026-06-04T01:52:45+10:00",
  "publisher" : "HL7 International / FHIR Infrastructure",
  "contact" : [{
    "name" : "HL7 International / FHIR Infrastructure",
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/fiwg"
    }]
  }],
  "description" : "This extension documents the features of a system using code/value pairs",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "code" : "001",
      "display" : "World"
    }]
  }],
  "fhirVersion" : "5.0.0",
  "mapping" : [{
    "identity" : "rim",
    "uri" : "http://hl7.org/v3",
    "name" : "RIM Mapping"
  }],
  "kind" : "complex-type",
  "abstract" : false,
  "context" : [{
    "type" : "element",
    "expression" : "CapabilityStatement"
  },
  {
    "type" : "element",
    "expression" : "TerminologyCapabilities"
  }],
  "type" : "Extension",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "id" : "Extension",
      "path" : "Extension",
      "definition" : "This extension documents the features of a system using code/value pairs"
    },
    {
      "id" : "Extension.extension",
      "path" : "Extension.extension",
      "min" : 2
    },
    {
      "id" : "Extension.extension:definition",
      "path" : "Extension.extension",
      "sliceName" : "definition",
      "min" : 1,
      "max" : "1",
      "mustSupport" : true
    },
    {
      "id" : "Extension.extension:definition.extension",
      "path" : "Extension.extension.extension",
      "max" : "0"
    },
    {
      "id" : "Extension.extension:definition.url",
      "path" : "Extension.extension.url",
      "fixedUri" : "definition"
    },
    {
      "id" : "Extension.extension:definition.value[x]",
      "path" : "Extension.extension.value[x]",
      "min" : 1,
      "type" : [{
        "code" : "canonical",
        "targetProfile" : ["http://hl7.org/fhir/uv/application-feature/StructureDefinition/FeatureDefinition"]
      }]
    },
    {
      "id" : "Extension.extension:context",
      "path" : "Extension.extension",
      "sliceName" : "context",
      "min" : 0,
      "max" : "*",
      "mustSupport" : true
    },
    {
      "id" : "Extension.extension:context.extension",
      "path" : "Extension.extension.extension",
      "max" : "0"
    },
    {
      "id" : "Extension.extension:context.url",
      "path" : "Extension.extension.url",
      "fixedUri" : "context"
    },
    {
      "id" : "Extension.extension:context.value[x]",
      "path" : "Extension.extension.value[x]",
      "short" : "The context(s) on which this feature can be defined. The context(s) declared in this extension must align with one or more of the contexts in the FeatureDefinition.",
      "min" : 1,
      "type" : [{
        "code" : "string"
      }]
    },
    {
      "id" : "Extension.extension:value",
      "path" : "Extension.extension",
      "sliceName" : "value",
      "min" : 1,
      "max" : "1",
      "mustSupport" : true
    },
    {
      "id" : "Extension.extension:value.extension",
      "path" : "Extension.extension.extension",
      "max" : "0"
    },
    {
      "id" : "Extension.extension:value.url",
      "path" : "Extension.extension.url",
      "fixedUri" : "value"
    },
    {
      "id" : "Extension.extension:value.value[x]",
      "path" : "Extension.extension.value[x]",
      "short" : "The value of the feature. Must align with the type and ValueSet (if a code type) in the FeatureDefinition.",
      "min" : 1
    },
    {
      "id" : "Extension.url",
      "path" : "Extension.url",
      "fixedUri" : "http://hl7.org/fhir/uv/application-feature/StructureDefinition/feature"
    },
    {
      "id" : "Extension.value[x]",
      "path" : "Extension.value[x]",
      "max" : "0"
    }]
  }
}

```
