{
  "@context": {
    "@vocab": "http://example/",
    "B": {"@context": {"c": "http://example.org/c"}}
  },
  "a": {
    "@context": {"@vocab": "http://example.com/"},
    "@type": "B",
    "a": "A in example.com",
    "c": "C in example.org"
  },
  "c": "C in example"
}