{
  "@context": "http://www.w3.org/ns/shex.jsonld",
  "type": "Schema",
  "shapes": [
    {
      "id": "S1",
      "type": "Shape",
      "expression": {
        "type": "TripleConstraint",
        "predicate": "p1",
        "valueExpr": {
          "type": "NodeConstraint",
          "values": [
            "o1"
          ]
        }
      }
    }
  ]
}