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

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

## OperationDefinition: Feature Query 

| | | |
| :--- | :--- | :--- |
| *Official URL*:http://hl7.org/fhir/uv/application-feature/OperationDefinition/feature-query | *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*:FeatureQuery |

 
This operation allows clients to query for features supported by a server. The operation may be invoked via HTTP GET or POST. Details are on the [specification](specification.md#asking-for-features) page. 



## Resource Content

```json
{
  "resourceType" : "OperationDefinition",
  "id" : "feature-query",
  "extension" : [{
    "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/OperationDefinition/feature-query",
  "version" : "1.0.0",
  "name" : "FeatureQuery",
  "title" : "Feature Query",
  "status" : "active",
  "kind" : "operation",
  "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 operation allows clients to query for features supported by a server. The operation may be invoked via HTTP GET or POST. Details are on the [specification](specification.html#asking-for-features) page.",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "code" : "001",
      "display" : "World"
    }]
  }],
  "code" : "feature-query",
  "system" : true,
  "type" : true,
  "instance" : false,
  "inputProfile" : "http://hl7.org/fhir/uv/application-feature/StructureDefinition/FeatureQueryInputParameters",
  "outputProfile" : "http://hl7.org/fhir/uv/application-feature/StructureDefinition/FeatureQueryOutputParameters",
  "parameter" : [{
    "name" : "feature",
    "use" : "in",
    "min" : 1,
    "max" : "1",
    "documentation" : "The feature that is the subject of the query",
    "type" : "Parameters"
  },
  {
    "name" : "feature",
    "use" : "out",
    "min" : 0,
    "max" : "1",
    "documentation" : "The answer to or any values associated with the queried feature",
    "type" : "Parameters"
  }]
}

```
