{
  "fields": [
    {"name": "id", "dtype": "integer", "required": true},
    {"name": "age", "dtype": "integer"},
    {"name": "active", "dtype": "boolean"},
    {"name": "joined", "dtype": "date"},
    {"name": "score", "dtype": "float"},
    {"name": "notes", "dtype": "string"}
  ]
}
