{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Brand overview (click to focus detail)",
  "data": {
    "name": "brands",
    "values": [
      {"brand_id": "alpha",   "score": 0.42},
      {"brand_id": "beta",    "score": 0.71},
      {"brand_id": "gamma",   "score": 0.58},
      {"brand_id": "delta",   "score": 0.34},
      {"brand_id": "epsilon", "score": 0.66}
    ]
  },
  "selection": {
    "brand_focus": {"type": "point", "fields": ["brand_id"], "toggle": true}
  },
  "mark": "bar",
  "encoding": {
    "x": {"field": "brand_id", "type": "nominal"},
    "y": {"field": "score",    "type": "quantitative"}
  }
}