Merge nested contexts

[]

-

{
  "@context": {
    "@vocab": "http://example.com/vocab#",
    "ex": "http://example.com/ex#"
  },
  "foo": 3,
  "ex:bar": 5,
  "ex:nested": {
    "@context": {
      "@vocab": "http://example.com/nested/vocab#",
      "ex": "http://example.com/nested/ex#"
    },
    "foo": 3,
    "ex:bar": 5
  }
}

{
  "http://example.com/vocab#foo": 3,
  "http://example.com/ex#bar": 5,
  "http://example.com/ex#nested": {
    "http://example.com/nested/vocab#foo": 3,
    "http://example.com/nested/ex#bar": 5
  }
}