{
  "description": "Indicates a value to assert as an if-none-exist header on a create or update action",
  "_filename": "StructureDefinition-CDSHookServiceResponseExtensionIfNoneExist.json",
  "package_name": "hl7.fhir.us.davinci-crd.r4b",
  "date": "2025-08-06T17:27:13+00:00",
  "derivation": "constraint",
  "publisher": "HL7 International / Financial Management",
  "fhirVersion": "4.3.0",
  "jurisdiction": [ {
    "coding": [ {
      "code": "US",
      "system": "urn:iso:std:iso:3166"
    } ]
  } ],
  "name": "CDSHookServiceResponseExtensionIfNoneExist",
  "abstract": false,
  "type": "string",
  "experimental": "false",
  "resourceType": "StructureDefinition",
  "title": "CDS Hooks Service Response If-None-Exist Extension",
  "package_version": "2.2.0-ballot",
  "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"
      } ]
    }
  } ],
  "snapshot": {
    "element": [ {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      } ],
      "path": "string",
      "min": 0,
      "definition": "Indicates a value to assert as an if-none-exist header on a create or update action",
      "isModifier": false,
      "short": "if-none-exist header value",
      "extension": [ {
        "url": "http://hl7.org/fhir/tools/StructureDefinition/json-name",
        "valueString": "davinci-crd.if-none-exist"
      } ],
      "max": "1",
      "id": "string",
      "comment": "Note that FHIR strings SHALL NOT exceed 1MB in size",
      "base": {
        "max": "*",
        "min": 0,
        "path": "string"
      },
      "isSummary": false
    }, {
      "path": "string.id",
      "min": 0,
      "definition": "unique id for the element within a resource (for internal references)",
      "isModifier": false,
      "short": "xml:id (or equivalent in JSON)",
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "string.id",
      "base": {
        "max": "1",
        "min": 0,
        "path": "Element.id"
      },
      "isSummary": false
    }, {
      "constraint": [ {
        "key": "ele-1",
        "human": "All FHIR elements must have a @value or children",
        "xpath": "@value|f:*|h:div",
        "source": "http://hl7.org/fhir/StructureDefinition/Element",
        "severity": "error",
        "expression": "hasValue() or (children().count() > id.count())"
      }, {
        "key": "ext-1",
        "human": "Must have either extensions or value[x], not both",
        "xpath": "exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])",
        "source": "http://hl7.org/fhir/StructureDefinition/Extension",
        "severity": "error",
        "expression": "extension.exists() != value.exists()"
      } ],
      "path": "string.extension",
      "min": 0,
      "definition": "May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, 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.",
      "isModifier": false,
      "short": "Additional content defined by implementations",
      "type": [ {
        "code": "Extension"
      } ],
      "alias": [ "extensions", "user content" ],
      "max": "*",
      "id": "string.extension",
      "comment": "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.",
      "base": {
        "max": "*",
        "min": 0,
        "path": "Element.extension"
      },
      "isSummary": false
    }, {
      "path": "string.value",
      "min": 0,
      "definition": "The actual value",
      "isModifier": false,
      "short": "Primitive value for string",
      "type": [ {
        "code": "http://hl7.org/fhirpath/System.String",
        "extension": [ {
          "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl": "string"
        }, {
          "url": "http://hl7.org/fhir/StructureDefinition/regex",
          "valueString": "[ \\r\\n\\t\\S]+"
        } ]
      } ],
      "representation": [ "xmlAttr" ],
      "max": "1",
      "id": "string.value",
      "maxLength": 1048576,
      "base": {
        "max": "1",
        "min": 0,
        "path": "string.value"
      },
      "isSummary": false
    } ],
    "extension": [ {
      "url": "http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version",
      "valueString": "4.0.1"
    } ]
  },
  "status": "active",
  "id": "ace992e1-ebcd-4eed-b0cf-32b6fd415cbd",
  "kind": "primitive-type",
  "url": "http://hl7.org/fhir/us/davinci-crd/StructureDefinition/CDSHookServiceResponseExtensionIfNoneExist",
  "identifier": [ {
    "value": "urn:oid:2.16.840.1.113883.4.642.40.18.42.22",
    "system": "urn:ietf:rfc:3986"
  } ],
  "context": [ {
    "type": "element",
    "expression": "CDSHooksResponse.cards.suggestions.actions.extension"
  } ],
  "version": "2.2.0-ballot",
  "differential": {
    "element": [ {
      "id": "string",
      "max": "1",
      "path": "string",
      "short": "if-none-exist header value",
      "extension": [ {
        "url": "http://hl7.org/fhir/tools/StructureDefinition/json-name",
        "valueString": "davinci-crd.if-none-exist"
      } ],
      "definition": "Indicates a value to assert as an if-none-exist header on a create or update action"
    } ]
  },
  "contact": [ {
    "telecom": [ {
      "value": "http://www.hl7.org/Special/committees/fm",
      "system": "url"
    } ]
  } ],
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/string"
}