curl --request GET \
  --url https://aodocs.altirnao.com/api/library/{libraryId}/classId/{classId}/documentId/{documentId}/attachmentId/{attachmentId}/checkXref \
  --header 'Authorization: Bearer <token>'

{
  "kind": "<string>",
  "mainDrawing": {
    "attachmentId": "<string>",
    "classId": "<string>",
    "documentId": "<string>",
    "domain": "<string>",
    "fileName": "<string>",
    "kind": "<string>",
    "libraryId": "<string>",
    "urn": "<string>",
    "xrefPath": "<string>"
  },
  "matchedAttachment": [
    {
      "attachmentId": "<string>",
      "classId": "<string>",
      "documentId": "<string>",
      "domain": "<string>",
      "fileName": "<string>",
      "kind": "<string>",
      "libraryId": "<string>",
      "urn": "<string>",
      "xrefPath": "<string>"
    }
  ],
  "missingXrefs": [
    "<string>"
  ]
}