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Source1

{
  "resourceType": "StructureDefinition",
  "id": "51c8f867-9fa0-4ca8-a82f-0f76d06d3bc2",
  "url": "https://fhir.nhs.uk/StructureDefinition/Extension-DM-ControlledDrug",
  "name": "ExtensionDMControlledDrug",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "mapping": [
    {
      "identity": "rim",
      "uri": "http://hl7.org/v3",
      "name": "RIM Mapping"
    }
  ],
  "kind": "complex-type",
  "abstract": false,
  "context": [
    {
      "type": "element",
      "expression": "MedicationRequest"
    }
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "constraint": [
          {
            "key": "eps-cd1",
            "severity": "error",
            "human": "Extension(controlledDrug) - For schedule 2 or 3 Controlled Drugs, the quantity must be expressed in words",
            "expression": "(((extension('schedule').value.code='CD2' and extension('quantityWords').exists()) or (extension('schedule').value.code='CD3' and extension('quantityWords').exists()) or (extension('schedule').value.code != 'CD2' and extension('schedule').value.code != 'CD3')) and extension('scheduled').exists()) or (extension('scheduled').exists().not())"
          }
        ]
      },
      {
        "id": "Extension.extension",
        "path": "Extension.extension",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "url"
            }
          ],
          "rules": "open"
        },
        "min": 0
      },
      {
        "id": "Extension.extension:quantityWords",
        "path": "Extension.extension",
        "sliceName": "quantityWords",
        "min": 0,
        "max": "1"
      },
      {
        "id": "Extension.extension:quantityWords.url",
        "path": "Extension.extension.url",
        "fixedUri": "quantityWords"
      },
      {
        "id": "Extension.extension:quantityWords.value[x]",
        "path": "Extension.extension.value[x]",
        "min": 1,
        "type": [
          {
            "code": "string"
          }
        ]
      },
      {
        "id": "Extension.extension:schedule",
        "path": "Extension.extension",
        "sliceName": "schedule",
        "min": 0,
        "max": "1",
        "binding": {
          "strength": "required",
          "valueSet": "https://fhir.nhs.uk/ValueSet/DM-medicationrequest-controlled-drug"
        }
      },
      {
        "id": "Extension.extension:schedule.url",
        "path": "Extension.extension.url",
        "fixedUri": "schedule"
      },
      {
        "id": "Extension.extension:schedule.value[x]",
        "path": "Extension.extension.value[x]",
        "min": 1,
        "type": [
          {
            "code": "Coding"
          }
        ]
      },
      {
        "id": "Extension.extension:schedule.value[x].system",
        "path": "Extension.extension.value[x].system",
        "min": 1
      },
      {
        "id": "Extension.extension:schedule.value[x].code",
        "path": "Extension.extension.value[x].code",
        "min": 1
      },
      {
        "id": "Extension.extension:schedule.value[x].display",
        "path": "Extension.extension.value[x].display",
        "min": 1
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "https://fhir.nhs.uk/StructureDefinition/Extension-DM-ControlledDrug"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "max": "0"
      }
    ]
  }
}