{
  "type": "ShapeTest",
  "node": "s1",
  "shape": "S1",
  "solution": {
    "type":"TripleConstraintSolutions", "predicate":"p1",
    "valueExpr": {
      "type": "NodeConstraint",
      "values": [ "o1" ]
    },
    "solutions":[
      {"type":"TestedTriple","subject":"s1","predicate":"p1","object":"o1"}
    ]
  }
}