json-ld serialization must not contain blank node references

instead of this

{
  "@id": "http://hannah-arendt-edition.net/data/lmt3q003",
  "@type": "http://hannah-arendt-edition.net/elements/Item",
  "http://hannah-arendt-edition.net/elements/hasNote": {
    "@id": "_:b0",
    "@type": "http://hannah-arendt-edition.net/elements/Note",
    "http://hannah-arendt-edition.net/elements/hasBibRef": {
      "@id": "_:b1",
      "@type": "http://hannah-arendt-edition.net/elements/BibRef",
      "http://hannah-arendt-edition.net/elements/biblCorresp": "http://hannah-arendt-edition.net/bibliography#Lobkowicz",
      "http://hannah-arendt-edition.net/elements/biblScope": "123",
      "http://hannah-arendt-edition.net/elements/biblScopeN": "fe2"
    },
    "http://hannah-arendt-edition.net/elements/p": "<p xmlns=\"http://www.tei-c.org/ns/1.0\">TEST</p>",
    "http://hannah-arendt-edition.net/elements/rend": "Auto",
    "http://hannah-arendt-edition.net/elements/internalNote": null
  },
  "http://hannah-arendt-edition.net/elements/listCorresp": {
    "@id": "http://hannah-arendt-edition.net/volume/XIV"
  },
  "http://hannah-arendt-edition.net/elements/listId": "XIV-commentaryDataLifeOfTheMind"
}

serialize with blank node ids removed

{
  "@id": "http://hannah-arendt-edition.net/data/lmt3q003",
  "@type": "http://hannah-arendt-edition.net/elements/Item",
  "http://hannah-arendt-edition.net/elements/hasNote": {
    "@type": "http://hannah-arendt-edition.net/elements/Note",
    "http://hannah-arendt-edition.net/elements/hasBibRef": {
      "@type": "http://hannah-arendt-edition.net/elements/BibRef",
      "http://hannah-arendt-edition.net/elements/biblCorresp": "http://hannah-arendt-edition.net/bibliography#Lobkowicz",
      "http://hannah-arendt-edition.net/elements/biblScope": "123",
      "http://hannah-arendt-edition.net/elements/biblScopeN": "fe2"
    },
    "http://hannah-arendt-edition.net/elements/p": "<p xmlns=\"http://www.tei-c.org/ns/1.0\">TEST</p>",
    "http://hannah-arendt-edition.net/elements/rend": "Auto",
    "http://hannah-arendt-edition.net/elements/internalNote": null
  },
  "http://hannah-arendt-edition.net/elements/listCorresp": {
    "@id": "http://hannah-arendt-edition.net/volume/XIV"
  },
  "http://hannah-arendt-edition.net/elements/listId": "XIV-commentaryDataLifeOfTheMind"
}