BIB-538

{
  "538": {
    "ind1": " ",
    "ind2": " ",
    "subfields": [
      {
        "a": "DVD-spelare krävs"
      },
      {
        "u": "https://example.org/system-details"
      }
    ]
  }
}

{
  "mainEntity": {
    "marc:hasSystemDetailsNote": [
      {
        "@type": "marc:SystemDetailsNote",
        "marc:systemDetailsNote": "DVD-spelare krävs",
        "marc:uniformResourceIdentifier": [
          "https://example.org/system-details"
        ]
      }
    ]
  }
}