{
  "@context": {
    "@version": 1.1,
    "@base": "http://example.com/",
    "@vocab": "http://example.com/",
    "author": {"@type": "@id", "@container": "@index", "@index": "prop"}
  },
  "@id": "article",
  "author": {
    "@none": ["person/1", "person/2", "person/3"]
  }
}