{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://gateway.eu1.mindsphere.io/schemas/asset",
  "title": "MindSphere Asset",
  "description": "An industrial IoT asset (digital twin instance) in the MindSphere Asset Management service",
  "type": "object",
  "properties": {
    "assetId": {
      "type": "string",
      "format": "uuid",
      "description": "Unique asset identifier (UUID)"
    },
    "name": {
      "type": "string",
      "description": "Asset display name",
      "maxLength": 128
    },
    "externalId": {
      "type": "string",
      "description": "External identifier for integration with source systems",
      "maxLength": 255
    },
    "description": {
      "type": "string",
      "description": "Asset description",
      "maxLength": 2048
    },
    "typeId": {
      "type": "string",
      "description": "Asset type identifier (tenant.name format)",
      "examples": ["tenant.PumpType", "core.BasicAsset"]
    },
    "parentId": {
      "type": ["string", "null"],
      "format": "uuid",
      "description": "Parent asset UUID; null for root assets"
    },
    "timezone": {
      "type": "string",
      "description": "IANA timezone identifier for this asset",
      "examples": ["Europe/Berlin", "America/Chicago", "Asia/Tokyo"]
    },
    "twinType": {
      "type": "string",
      "enum": ["performance", "simulation", "shop_floor"],
      "description": "Digital twin modeling type"
    },
    "location": {
      "$ref": "#/$defs/Location"
    },
    "variables": {
      "type": "array",
      "description": "Static configuration variables for this asset",
      "items": {
        "$ref": "#/$defs/VariableValue"
      }
    },
    "aspects": {
      "type": "array",
      "description": "Aspect instances associated with this asset",
      "items": {
        "$ref": "#/$defs/AspectRef"
      }
    },
    "etag": {
      "type": "integer",
      "description": "ETag version for optimistic locking",
      "minimum": 0
    },
    "tenantId": {
      "type": "string",
      "description": "MindSphere tenant identifier"
    },
    "createdAt": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp when the asset was created"
    },
    "updatedAt": {
      "type": "string",
      "format": "date-time",
      "description": "Timestamp of last modification"
    }
  },
  "required": ["assetId", "name", "typeId"],
  "$defs": {
    "Location": {
      "type": "object",
      "description": "Geographic location of the physical asset",
      "properties": {
        "country": {
          "type": "string",
          "description": "ISO 3166-1 alpha-2 country code",
          "pattern": "^[A-Z]{2}$"
        },
        "region": {
          "type": "string"
        },
        "locality": {
          "type": "string",
          "description": "City or locality"
        },
        "streetAddress": {
          "type": "string"
        },
        "postalCode": {
          "type": "string"
        },
        "latitude": {
          "type": "number",
          "minimum": -90,
          "maximum": 90
        },
        "longitude": {
          "type": "number",
          "minimum": -180,
          "maximum": 180
        },
        "altitude": {
          "type": "number",
          "description": "Altitude in meters above sea level"
        }
      }
    },
    "VariableValue": {
      "type": "object",
      "description": "A named variable value for asset configuration",
      "properties": {
        "name": {
          "type": "string"
        },
        "value": {
          "description": "Variable value — type depends on aspect variable definition",
          "oneOf": [
            {"type": "number"},
            {"type": "string"},
            {"type": "boolean"},
            {"type": "null"}
          ]
        }
      },
      "required": ["name", "value"]
    },
    "AspectRef": {
      "type": "object",
      "description": "Reference to an aspect associated with this asset",
      "properties": {
        "name": {
          "type": "string",
          "description": "Aspect instance name on this asset"
        },
        "aspectTypeId": {
          "type": "string",
          "description": "Aspect type identifier"
        }
      },
      "required": ["name", "aspectTypeId"]
    }
  }
}