Web Annotation First Example Comparison - these are all the same

resulting-nquads-of-all-three.ttl

<http://example.org/anno1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#Annotation> .
<http://example.org/anno1> <http://www.w3.org/ns/oa#hasBody> <http://example.org/post1> .
<http://example.org/anno1> <http://www.w3.org/ns/oa#hasTarget> <http://example.com/page1> .

target-as-array.jsonld

{
  "@context": "http://www.w3.org/ns/anno.jsonld",
  "id": "http://example.org/anno1",
  "type": "Annotation",
  "body": "http://example.org/post1",
  "target": [
    {
      "id": "http://example.com/page1"
    }
  ]
}

target-as-object.jsonld

{
  "@context": "http://www.w3.org/ns/anno.jsonld",
  "id": "http://example.org/anno1",
  "type": "Annotation",
  "body": "http://example.org/post1",
  "target": {
    "id": "http://example.com/page1"
  }
}

target-as-string.jsonld

{
  "@context": "http://www.w3.org/ns/anno.jsonld",
  "id": "http://example.org/anno1",
  "type": "Annotation",
  "body": "http://example.org/post1",
  "target": "http://example.com/page1"
}