{
  "@context": "http://www.w3.org/ns/shex.jsonld",
  "type": "Schema",
  "shapes": [
    { "type": "ShapeDecl",
    "id": "http://a.example/S1",
    "shapeExpr": {
      "type": "Shape",
      "expression": {
        "type": "TripleConstraint",
        "predicate": "http://a.example/p1",
        "valueExpr": {
          "type": "ShapeNot",
          "shapeExpr": {
            "type": "NodeConstraint",
            "values": [
              "http://a.example/v1",
              "http://a.example/v2",
              "http://a.example/v3"
            ]
          }
        }
      }
    } }
  ]
}