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Source1

{
  "resourceType": "StructureDefinition",
  "id": "BL",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/tools/StructureDefinition/logical-target",
      "_valueBoolean": {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/data-absent-reason",
            "valueCode": "not-applicable"
          }
        ]
      }
    },
    {
      "url": "http://hl7.org/fhir/tools/StructureDefinition/xml-namespace",
      "valueUri": "urn:hl7-org:v3"
    },
    {
      "url": "http://hl7.org/fhir/tools/StructureDefinition/logical-container",
      "valueUri": "http://hl7.org/cda/stds/core/StructureDefinition/ClinicalDocument"
    }
  ],
  "url": "http://hl7.org/cda/stds/core/StructureDefinition/BL",
  "version": "1.0.1",
  "name": "BL",
  "title": "BL: Boolean (V3 Data Type)",
  "status": "active",
  "experimental": false,
  "date": "2025-12-04T21:33:04+00:00",
  "publisher": "HL7",
  "description": "The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL.",
  "fhirVersion": "5.0.0",
  "mapping": [
    {
      "identity": "rim",
      "uri": "http://hl7.org/v3",
      "name": "RIM Mapping"
    }
  ],
  "kind": "logical",
  "abstract": false,
  "type": "http://hl7.org/cda/stds/core/StructureDefinition/BL",
  "baseDefinition": "http://hl7.org/cda/stds/core/StructureDefinition/ANY",
  "derivation": "specialization",
  "snapshot": {
    "extension": [
      {
        "url": "http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version",
        "valueString": "1.0.1"
      }
    ],
    "element": [
      {
        "id": "BL",
        "path": "BL",
        "short": "Base for all types and resources",
        "definition": "The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL.",
        "min": 1,
        "max": "*",
        "base": {
          "path": "Base",
          "min": 0,
          "max": "*"
        },
        "constraint": [
          {
            "key": "value-null",
            "severity": "error",
            "human": "value and nullFlavor are mutually exclusive (one must be present)",
            "expression": "(value | nullFlavor).count() = 1"
          }
        ],
        "isModifier": false,
        "mapping": [
          {
            "identity": "rim",
            "map": "n/a"
          }
        ]
      },
      {
        "id": "BL.nullFlavor",
        "path": "BL.nullFlavor",
        "representation": [
          "xmlAttr"
        ],
        "label": "Exceptional Value Detail",
        "definition": "If a value is an exceptional value (NULL-value), this specifies in what way and why proper information is missing.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "ANY.nullFlavor",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "code",
            "profile": [
              "http://hl7.org/cda/stds/core/StructureDefinition/cs-simple"
            ]
          }
        ],
        "binding": {
          "strength": "required",
          "valueSet": "http://hl7.org/cda/stds/core/ValueSet/CDANullFlavor"
        }
      },
      {
        "id": "BL.value",
        "path": "BL.value",
        "representation": [
          "xmlAttr"
        ],
        "definition": "The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL.",
        "min": 0,
        "max": "1",
        "base": {
          "path": "BL.value",
          "min": 0,
          "max": "1"
        },
        "type": [
          {
            "code": "boolean",
            "profile": [
              "http://hl7.org/cda/stds/core/StructureDefinition/bl-simple"
            ]
          }
        ]
      }
    ]
  },
  "differential": {
    "element": [
      {
        "id": "BL",
        "path": "BL",
        "definition": "The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL.",
        "min": 1,
        "max": "*",
        "constraint": [
          {
            "key": "value-null",
            "severity": "error",
            "human": "value and nullFlavor are mutually exclusive (one must be present)",
            "expression": "(value | nullFlavor).count() = 1"
          }
        ]
      },
      {
        "id": "BL.value",
        "path": "BL.value",
        "representation": [
          "xmlAttr"
        ],
        "definition": "The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL.",
        "min": 0,
        "max": "1",
        "type": [
          {
            "code": "boolean",
            "profile": [
              "http://hl7.org/cda/stds/core/StructureDefinition/bl-simple"
            ]
          }
        ]
      }
    ]
  }
}