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{
  "type": "object",
  "title": "Preprint",
  "required": [
    "openAlexId",
    "title",
    "umassAuthors"
  ],
  "properties": {
    "doi": {
      "type": "string",
      "description": "Bare DOI, lowercased. Absent when OpenAlex has none."
    },
    "url": {
      "type": "string"
    },
    "isOa": {
      "type": "boolean"
    },
    "year": {
      "type": "integer"
    },
    "field": {
      "type": "string",
      "description": "Top-level field of the leading topic"
    },
    "title": {
      "type": "string"
    },
    "pdfUrl": {
      "type": "string"
    },
    "posted": {
      "type": "string",
      "description": "Publication date as OpenAlex has it"
    },
    "server": {
      "type": "string",
      "description": "Primary hosting source, e.g. arXiv, SSRN, bioRxiv"
    },
    "topics": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "citedBy": {
      "type": "integer"
    },
    "updated": {
      "type": "string"
    },
    "abstract": {
      "type": "string",
      "description": "Rebuilt from OpenAlex's inverted index; truncated at 4000 characters"
    },
    "oaStatus": {
      "type": "string"
    },
    "serverId": {
      "type": "string",
      "description": "OpenAlex source id"
    },
    "openAlexId": {
      "type": "string",
      "description": "OpenAlex work id, e.g. W2159951525"
    },
    "authorCount": {
      "type": "integer",
      "description": "Total authors on the work, UMass or not"
    },
    "umassAuthors": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "orcid": {
            "type": "string"
          },
          "openAlexId": {
            "type": "string"
          }
        }
      },
      "description": "Only the authorships affiliated to UMass Amherst, not the full author list."
    },
    "openalexInScholarWorks": {
      "type": "boolean",
      "description": "True when one of those copies is a UMass ScholarWorks source. OpenAlex's claim, not ours. umass/holdings checks it against the catalogue."
    },
    "openalexRepositoryCopies": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "url": {
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "version": {
            "type": "string"
          },
          "sourceId": {
            "type": "string"
          }
        }
      },
      "description": "Repository locations OpenAlex records for this work, carried verbatim."
    }
  },
  "description": "A work OpenAlex types as a preprint with at least one UMass Amherst author."
}