{
  "@context": {
    "ex": "http://example.org/vocab#",
    "ex:p7": {"@container": "@set"}
  },
  "@graph": [{
    "@id": "http://example.org/test/#example1",
    "@type": "ex:Example1",
    "ex:p1": "non-default",
    "ex:p2": "custom-default",
    "ex:p3": 3,
    "ex:p5": null,
    "ex:p6": {
      "@id": "http://example.org/test/#example2",
      "@type": "ex:Example2",
      "ex:p3": 4
    },
    "ex:p7": []
  }]
}