# CDS Hooks Service Request Requested CRD Version Extension - Da Vinci - Coverage Requirements Discovery v2.2.1

## Data Type Profile: CDS Hooks Service Request Requested CRD Version Extension 

 
Allows indicating the desired CRD version when invoking CRD on a service that supports multiple versions 

**Usages:**

* This Primitive Type Profile is not used by any profiles in this Implementation Guide

You can also check for [usages in the FHIR IG Statistics](https://packages2.fhir.org/xig/hl7.fhir.us.davinci-crd|current/StructureDefinition/CDSHookServiceRequestExtensionRequestCRDVersion)

### Formal Views of Profile Content

 [Description Differentials, Snapshots, and other representations](http://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#structure-definitions). 

 

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



## Resource Content

```json
{
  "resourceType" : "StructureDefinition",
  "id" : "CDSHookServiceRequestExtensionRequestCRDVersion",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "fm"
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 4,
    "_valueInteger" : {
      "extension" : [{
        "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
        "valueCanonical" : "http://hl7.org/fhir/us/davinci-crd/ImplementationGuide/davinci-crd"
      }]
    }
  },
  {
    "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/us/davinci-crd/ImplementationGuide/davinci-crd"
      }]
    }
  }],
  "url" : "http://hl7.org/fhir/us/davinci-crd/StructureDefinition/CDSHookServiceRequestExtensionRequestCRDVersion",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.4.642.40.18.42.49"
  }],
  "version" : "2.2.1",
  "name" : "CDSHookServiceRequestExtensionRequestCRDVersion",
  "title" : "CDS Hooks Service Request Requested CRD Version Extension",
  "status" : "active",
  "experimental" : false,
  "date" : "2026-03-26T15:54:25+00:00",
  "publisher" : "HL7 International / Financial Management",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/fm"
    }]
  }],
  "description" : "Allows indicating the desired CRD version when invoking CRD on a service that supports multiple versions",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "urn:iso:std:iso:3166",
      "code" : "US"
    }]
  }],
  "fhirVersion" : "4.0.1",
  "kind" : "primitive-type",
  "abstract" : false,
  "context" : [{
    "type" : "element",
    "expression" : "CDSHooksRequest.extension"
  }],
  "type" : "string",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/string",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "id" : "string",
      "extension" : [{
        "url" : "http://hl7.org/fhir/tools/StructureDefinition/json-name",
        "valueString" : "davinci-crd.requestedVersion"
      }],
      "path" : "string",
      "short" : "CRD version requested by the client",
      "definition" : "Indicates the CRD version the service response needs to comply with.  (If this is not a version supported by the service, it **SHALL** return an error.)",
      "max" : "1"
    }]
  }
}

```
