{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Bar with point selection",
  "data": {
    "name": "scores",
    "values": [
      {"brand_id": "alpha", "score": 0.42},
      {"brand_id": "beta",  "score": 0.71},
      {"brand_id": "gamma", "score": 0.58}
    ]
  },
  "selection": {
    "highlight": {"type": "point", "fields": ["brand_id"], "toggle": true}
  },
  "mark": "bar",
  "encoding": {
    "x": {"field": "brand_id", "type": "nominal"},
    "y": {"field": "score",    "type": "quantitative"}
  }
}