{
   "@context": "http://www.w3.org/ns/shex.jsonld",
   "shapes": [
      {
         "id": "http://a.example/Sext",
         "expression": {
            "predicate": "http://a.example/p2",
            "type": "TripleConstraint"
         },
         "type": "Shape"
      }
   ],
   "type": "Schema"
}