{
  "@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": "ShapeAnd",
          "shapeExprs": [
            {
              "type": "ShapeNot",
              "shapeExpr": {
                "type": "NodeConstraint",
                "values": [
                  "http://a.example/v1"
                ]
              }
            },
            {
              "type": "NodeConstraint",
              "values": [
                "http://a.example/v2"
              ]
            }
          ]
        }
      }
    } }
  ]
}