{
  "@context": "http://www.w3.org/ns/shex.jsonld",
  "type": "Schema",
  "shapes": [
    {
      "id": "http://a.example.org/S",
      "type": "Shape",
      "expression": {
        "type": "EachOf",
        "expressions": [
          {
            "type": "EachOf",
            "expressions": [
              {
                "type": "TripleConstraint",
                "predicate": "http://a.example/a"
              },
              {
                "type": "TripleConstraint",
                "predicate": "http://a.example/b"
              }
            ],
            "min": 0,
            "max": 1
          },
          {
            "type": "TripleConstraint",
            "predicate": "http://a.example/c"
          }
        ]
      }
    }
  ]
}