{
  "resourceType": "StructureDefinition",
  "id": "code",
  "text": {
    "status": "generated",
    "div": "\u003cdiv xmlns\u003d\"http://www.w3.org/1999/xhtml\"\u003eto do\u003c/div\u003e"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode": "normative"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
      "valueCode": "4.0.0"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics",
      "valueCode": "can-bind"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics",
      "valueCode": "has-length"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "fhir"
    }
  ],
  "url": "http://hl7.org/fhir/StructureDefinition/code",
  "version": "6.0.0-ballot4",
  "name": "code",
  "status": "active",
  "experimental": false,
  "date": "2026-05-18T12:49:36+00:00",
  "publisher": "HL7 International / FHIR Infrastructure",
  "contact": [
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://hl7.org/fhir"
        }
      ]
    },
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/fiwg"
        }
      ]
    }
  ],
  "description": "code type: A string which has at least one character and no leading or trailing whitespace and where there is no whitespace other than single spaces in the contents",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001",
          "display": "World"
        }
      ]
    }
  ],
  "fhirVersion": "6.0.0-ballot4",
  "kind": "primitive-type",
  "abstract": false,
  "type": "code",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/string",
  "derivation": "specialization",
  "snapshot": {
    "element": [
      {
        "id": "code",
        "path": "code",
        "short": "Primitive Type code",
        "definition": "A string which has at least one character and no leading or trailing whitespace and where there is no whitespace other than single spaces in the contents",
        "min": 0,
        "max": "*",
        "base": {
          "path": "code",
          "min": 0,
          "max": "*"
        },
        "constraint": [
          {
            "key": "ele-1",
            "severity": "error",
            "human": "All FHIR elements must have a @value or children or both",
            "expression": "hasValue() or (children().count() \u003e id.count())",
            "source": "http://hl7.org/fhir/StructureDefinition/Element"
          }
        ],
        "isModifier": false,
        "isSummary": false
      },
      {
        "id": "code.id",
        "path": "code.id",
        "representation": [
          "xmlAttr"
        ],
        "short": "xml:id (or equivalent in JSON)",
        "definition": "unique id for the element within a resource (for internal references)",
        "min": 0,
        "max": "1",
        "base": {
          "path": "Element.id",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "extension": [
              {
                "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                "valueUrl": "string"
              }
            ],
            "code": "http://hl7.org/fhirpath/System.String"
          }
        ],
        "isModifier": false,
        "isSummary": false
      },
      {
        "id": "code.extension",
        "path": "code.extension",
        "short": "Additional content defined by implementations",
        "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 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.",
        "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.",
        "alias": [
          "extensions",
          "user content"
        ],
        "min": 0,
        "max": "*",
        "base": {
          "path": "Element.extension",
          "min": 0,
          "max": "*"
        },
        "type": [
          {
            "code": "Extension"
          }
        ],
        "constraint": [
          {
            "key": "ele-1",
            "severity": "error",
            "human": "All FHIR elements must have a @value or children",
            "expression": "hasValue() or (children().count() \u003e id.count())",
            "source": "http://hl7.org/fhir/StructureDefinition/Element"
          },
          {
            "key": "ext-1",
            "severity": "error",
            "human": "Must have either extensions or value[x], not both",
            "expression": "extension.exists() !\u003d value.exists()",
            "source": "http://hl7.org/fhir/StructureDefinition/Extension"
          }
        ],
        "isModifier": false,
        "isSummary": false
      },
      {
        "id": "code.value",
        "path": "code.value",
        "representation": [
          "xmlAttr"
        ],
        "short": "Primitive value for code",
        "definition": "Primitive value for code",
        "min": 0,
        "max": "1",
        "base": {
          "path": "string.value",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "extension": [
              {
                "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                "valueUrl": "code"
              },
              {
                "url": "http://hl7.org/fhir/StructureDefinition/regex",
                "valueString": "[^\\s]+( [^\\s]+)*"
              }
            ],
            "code": "http://hl7.org/fhirpath/System.String"
          }
        ],
        "isModifier": false,
        "isSummary": false
      }
    ]
  },
  "differential": {
    "element": [
      {
        "id": "code",
        "path": "code",
        "short": "Primitive Type code",
        "definition": "A string which has at least one character and no leading or trailing whitespace and where there is no whitespace other than single spaces in the contents",
        "min": 0,
        "max": "*"
      },
      {
        "id": "code.value",
        "path": "code.value",
        "representation": [
          "xmlAttr"
        ],
        "short": "Primitive value for code",
        "definition": "Primitive value for code",
        "min": 0,
        "max": "1",
        "type": [
          {
            "extension": [
              {
                "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
                "valueUrl": "code"
              },
              {
                "url": "http://hl7.org/fhir/StructureDefinition/regex",
                "valueString": "[^\\s]+( [^\\s]+)*"
              }
            ],
            "code": "http://hl7.org/fhirpath/System.String"
          }
        ]
      }
    ]
  }
}