{
  "@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": "NodeConstraint",
          "values": [
            "http://a.example/o1",
            "http://a.example/o2"
          ]
        },
        "min": 1,
        "max": -1
      },
      "extra": [
        "http://a.example/p1"
      ]
    } }
  ]
}