{
  "type": "ShapeOrResults",
  "solution": {
    "type": "NodeTest",
    "node": { "value": "v1", "type": "http://a.example/dt1" },
    "shape": "http://a.example/vs1",
    "shapeExpr": {
      "type": "NodeConstraint",
      "datatype": "http://a.example/dt1"
    }
  }
}