openapi: 3.2.0
info:
  title: Brown Digital Repository (BDR) Items API
  version: '2026-08-30'
  summary: Public, keyless read API over the Brown University Library's digital repository.
  description: 'The Brown Digital Repository (BDR) is the Brown University Library''s platform for gathering,

    indexing, storing, preserving and making available digital assets produced by scholarly,

    instructional, research and administrative activity at Brown.'
  contact:
    name: Brown University Library
    url: https://library.brown.edu
  termsOfService: https://policy.brown.edu/policy/privacy
  license:
    name: Rights vary per repository object; see each object's MODS metadata
    url: https://repository.library.brown.edu/studio/
  x-operator: institution
  x-operator-basis: Host is under brown.edu, Brown's own registrable domain. The repository application is authored and maintained by the Brown University Library (public source in https://github.com/Brown-University-Library — bdr_indexer, bdrxml, bdr_uploader_hub_project, bdr-api-tools), the API documentation is written by Brown Library staff in Brown's own GitHub wiki, and DataCite lists the repository as Brown's registered client BROWN.BDR. No vendor platform identity appears in servers[], info.title or info.contact.
  x-provenance:
    generated: '2026-08-30'
    method: derived
    source:
    - https://github.com/Brown-University-Library/bdr_api_documentation/wiki
    - https://repository.library.brown.edu/api/
    - https://repository.library.brown.edu/api/search/?q=primary_title:irish&rows=2&fl=pid,primary_title,abstract
    - https://repository.library.brown.edu/api/items/bdr:80246/
    - https://repository.library.brown.edu/api/collections/
    - https://api.datacite.org/clients/brown.bdr
    note: Derived from Brown's own prose documentation plus live probing on 2026-08-30. Not published by Brown as a specification. Do not present this document as a Brown-authored contract.
servers:
- url: https://repository.library.brown.edu
  description: Brown Digital Repository production
security: []
tags:
- name: Items
  description: Metadata for a single repository object, addressed by PID.
paths:
  /api/items/{pid}/:
    get:
      tags:
      - Items
      operationId: getItem
      summary: Get one repository object
      description: 'Returns the full metadata record for a single object. The response is link-rich: `api_links` dereferences to collection and search API calls, `links.views.iiif_image_info` and `links.views.iiif_manifest` point at the IIIF surface, and `links.content_datastreams` and `links.descriptive_datastreams` point at the object''s binary and MODS XML.'
      parameters:
      - name: pid
        in: path
        required: true
        description: Persistent identifier, e.g. `bdr:80246`. Both numeric and Noid-style suffixes occur.
        schema:
          type: string
          pattern: ^bdr:[A-Za-z0-9]+$
        example: bdr:80246
      responses:
        '200':
          description: Object metadata
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Item'
        '403':
          description: Forbidden. Documented by Brown for an item that is not found OR is a private object.
          content:
            text/html:
              schema:
                type: string
        '404':
          description: Not Found. OBSERVED behaviour for an unknown PID — `bdr:0000000` returned 404 with the nine-byte `text/html` body `Not Found`, not the documented 403 and not JSON. A client parsing every response as JSON will throw here.
          content:
            text/html:
              schema:
                type: string
              example: Not Found
        '500':
          description: Internal server error, per Brown's documented exception behaviour.
components:
  schemas:
    Item:
      type: object
      description: A full object record from the item API.
      additionalProperties: true
      required:
      - pid
      properties:
        pid:
          type: string
        object_type:
          type: string
        primary_title:
          type: string
        uri:
          type: string
          format: uri
          description: Human web view of the object.
        json_uri:
          type: string
          format: uri
          description: Self link — this item API call.
        brief:
          type: object
          description: Display-oriented summary block; every value is an array of strings.
          additionalProperties: true
        relations:
          $ref: '#/components/schemas/Relations'
        api_links:
          type: object
          description: Dereferenceable API URLs for this object's collections and keywords.
          additionalProperties: true
        links:
          $ref: '#/components/schemas/ItemLinks'
        views_dict:
          type: object
          description: Named viewer and IIIF URLs. Duplicates `links.views`.
          additionalProperties:
            type: string
            format: uri
        datastreams:
          type: object
          description: Per-datastream mimeType, size, SHA-512 checksum and lastModified.
          additionalProperties: true
    Relations:
      type: object
      description: Fixed set of relation predicates, each an array. Empty arrays are returned rather than omitted, so a client can rely on every key being present.
      properties:
        hasAnnotation:
          type: array
          items:
            type: object
            additionalProperties: true
        hasDerivation:
          type: array
          items:
            type: object
            additionalProperties: true
        hasDescription:
          type: array
          items:
            type: object
            additionalProperties: true
        hasTranscript:
          type: array
          items:
            type: object
            additionalProperties: true
        hasTranslation:
          type: array
          items:
            type: object
            additionalProperties: true
        hasPart:
          type: array
          items:
            type: object
            additionalProperties: true
        isDerivationOf:
          type: array
          items:
            type: object
            additionalProperties: true
        isVersionOf:
          type: array
          items:
            type: object
            additionalProperties: true
        isTranscriptOf:
          type: array
          items:
            type: object
            additionalProperties: true
        isTranslationOf:
          type: array
          items:
            type: object
            additionalProperties: true
        isMemberOf:
          type: array
          items:
            type: object
            additionalProperties: true
        isPartOf:
          type: array
          items:
            type: object
            additionalProperties: true
        isMemberOfCollection:
          type: array
          items:
            $ref: '#/components/schemas/CollectionRef'
    ItemLinks:
      type: object
      properties:
        thumbnail:
          type: string
          format: uri
        descriptive_datastreams:
          type: object
          description: Descriptive metadata datastreams. `MODS` is the descriptive standard the BDR serves, as XML.
          additionalProperties:
            type: string
            format: uri
        content_datastreams:
          type: object
          description: Binary content datastreams, e.g. `highres`, `lowres`.
          additionalProperties:
            type: string
            format: uri
        views:
          type: object
          description: Viewer and IIIF endpoints, including `iiif_image_info` and `iiif_manifest`. These are the documented route from the item API into the IIIF surface; the IIIF paths are not otherwise discoverable, and `/iiif` is disallowed in the repository's robots.txt.
          additionalProperties:
            type: string
            format: uri
    CollectionRef:
      type: object
      properties:
        pid:
          type: string
        id:
          type: string
        db_id:
          type: integer
        name:
          type: string
        description:
          type: string
        tags:
          type: array
          items:
            type: string
        json_uri:
          type: string
          format: uri
          description: Collection API URL for this collection.
        uri:
          type: string
          format: uri
          description: Human web view of this collection.
        thumbnail_url:
          type: string
          format: uri
x-access:
  authentication: none
  description: Every documented BDR API endpoint is anonymous and keyless. There is no API key, no OAuth flow and no registration step. The boundary is not authentication but VISIBILITY — the index exposes `_display_public_bsi`, `_display_brown_bsi` and `_display_private_bsi`, and the anonymous API sees only public objects. Brown-affiliated access to the wider set goes through the Shibboleth login the `links.login` key on every search response points at.
x-throttling:
  observed_headers: none
  description: 'No rate-limit headers were returned on any probe. Brown documents in its own API wiki that Cloudflare bot protection was added in Spring 2025 and may affect API users requesting a large volume of items at a high rate, and advises Brown community members to use the VPN to reduce the impact. The repository''s robots.txt sets `Crawl-delay: 30`. The 500-row response cap is the only hard, observable limit.'