{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.charmhealth.com/schemas/observation.json",
  "title": "CharmHealth FHIR Observation",
  "description": "Subset of FHIR R4 Observation as exposed by CharmHealth EHR.",
  "type": "object",
  "required": ["resourceType", "status", "code"],
  "properties": {
    "resourceType": { "const": "Observation" },
    "id": { "type": "string" },
    "status": {
      "type": "string",
      "enum": [
        "registered",
        "preliminary",
        "final",
        "amended",
        "corrected",
        "cancelled",
        "entered-in-error",
        "unknown"
      ]
    },
    "category": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "coding": {
            "type": "array",
            "items": { "$ref": "#/$defs/coding" }
          }
        }
      }
    },
    "code": {
      "type": "object",
      "properties": {
        "coding": {
          "type": "array",
          "items": { "$ref": "#/$defs/coding" }
        }
      }
    },
    "subject": {
      "type": "object",
      "properties": {
        "reference": { "type": "string" }
      }
    },
    "effectiveDateTime": { "type": "string", "format": "date-time" },
    "valueQuantity": {
      "type": "object",
      "properties": {
        "value": { "type": "number" },
        "unit": { "type": "string" },
        "system": { "type": "string" },
        "code": { "type": "string" }
      }
    }
  },
  "$defs": {
    "coding": {
      "type": "object",
      "properties": {
        "system": { "type": "string" },
        "code": { "type": "string" },
        "display": { "type": "string" }
      }
    }
  }
}