{
  "title": "Siemens MindSphere Asset Structure",
  "description": "Hierarchical data model for MindSphere industrial IoT asset management",
  "type": "object",
  "structure": {
    "AssetType": {
      "description": "Template defining the type and capabilities of an asset class",
      "fields": {
        "typeId": { "type": "string", "role": "identifier" },
        "name": { "type": "string", "role": "label" },
        "description": { "type": "string", "role": "description" },
        "parentTypeId": { "type": "string", "role": "reference" },
        "aspects": { "type": "array", "role": "schema-reference" }
      },
      "children": {
        "AspectType": {
          "description": "Data schema template defining variables collected from an asset",
          "fields": {
            "aspectTypeId": { "type": "string", "role": "identifier" },
            "name": { "type": "string", "role": "label" },
            "description": { "type": "string", "role": "description" },
            "category": { "type": "enum", "values": ["static", "dynamic"] }
          },
          "children": {
            "Variable": {
              "description": "Individual data point definition within an aspect",
              "fields": {
                "name": { "type": "string", "role": "identifier" },
                "dataType": { "type": "enum", "values": ["INT", "LONG", "DOUBLE", "BOOLEAN", "STRING", "TIMESTAMP", "BIGSTRING"] },
                "unit": { "type": "string", "role": "label" },
                "searchable": { "type": "boolean", "role": "config" },
                "length": { "type": "integer", "role": "config" }
              }
            }
          }
        }
      }
    },
    "Asset": {
      "description": "Digital representation of a physical industrial device or system",
      "fields": {
        "assetId": { "type": "uuid", "role": "identifier" },
        "name": { "type": "string", "role": "label" },
        "description": { "type": "string", "role": "description" },
        "typeId": { "type": "string", "role": "type-reference" },
        "parentId": { "type": "string", "role": "parent-reference" },
        "timezone": { "type": "string", "role": "config" },
        "twinType": { "type": "enum", "values": ["performance", "simulation", "aggregation"], "role": "config" },
        "location": { "type": "object", "role": "geospatial" },
        "createdAt": { "type": "datetime", "role": "audit" },
        "updatedAt": { "type": "datetime", "role": "audit" }
      },
      "children": {
        "TimeseriesDataPoint": {
          "description": "A single timestamped measurement from an asset aspect",
          "fields": {
            "_time": { "type": "datetime", "role": "identifier", "description": "ISO 8601 UTC timestamp" },
            "variables": { "type": "map", "role": "measurements", "description": "Aspect variable values keyed by variable name" }
          }
        },
        "Event": {
          "description": "A significant occurrence reported by or affecting an asset",
          "fields": {
            "id": { "type": "uuid", "role": "identifier" },
            "entityId": { "type": "uuid", "role": "asset-reference" },
            "timestamp": { "type": "datetime", "role": "audit" },
            "typeId": { "type": "string", "role": "type-reference" },
            "severity": { "type": "integer", "role": "severity", "description": "0=INFO, 20=MINOR, 30=WARNING, 40=MAJOR, 50=CRITICAL" },
            "description": { "type": "string", "role": "description" }
          }
        }
      }
    }
  }
}