{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Independent color legends per layer",
  "resolve": {"scale": {"color": "independent"}},
  "layer": [
    {
      "$schema": "urn:prism:schema:v1:spec",
      "data": {"values": [
        {"x": "north", "y": 30, "team": "alpha"},
        {"x": "east",  "y": 45, "team": "beta"},
        {"x": "south", "y": 60, "team": "alpha"},
        {"x": "west",  "y": 75, "team": "beta"}
      ]},
      "mark": "bar",
      "encoding": {
        "x":     {"field": "x",    "type": "nominal"},
        "y":     {"field": "y",    "type": "quantitative"},
        "color": {"field": "team", "type": "nominal"}
      }
    },
    {
      "$schema": "urn:prism:schema:v1:spec",
      "data": {"values": [
        {"x": "north", "y": 22, "category": "premium"},
        {"x": "east",  "y": 18, "category": "premium"},
        {"x": "south", "y": 9,  "category": "standard"},
        {"x": "west",  "y": 14, "category": "standard"}
      ]},
      "mark": "point",
      "encoding": {
        "x":     {"field": "x",        "type": "nominal"},
        "y":     {"field": "y",        "type": "quantitative"},
        "color": {"field": "category", "type": "nominal"}
      }
    }
  ]
}