{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Binary decision tree",
  "data": {
    "name": "decisions",
    "values": [
      {"id": "root",   "parent": null,   "name": "score > 0.5?"},
      {"id": "left",   "parent": "root", "name": "age > 30?"},
      {"id": "right",  "parent": "root", "name": "premium"},
      {"id": "ll",     "parent": "left", "name": "basic"},
      {"id": "lr",     "parent": "left", "name": "trial"},
      {"id": "rl",     "parent": "right","name": "annual"},
      {"id": "rr",     "parent": "right","name": "monthly"}
    ]
  },
  "mark": {"type": "tree", "node_shape": "rect", "node_size": 12, "link_shape": "curve"},
  "encoding": {
    "source": {"field": "parent"},
    "target": {"field": "id"},
    "text":   {"field": "name"}
  }
}