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OpenAPI Specification

openapi: 3.2.0
info:
  title: Edgepedia Related API
  version: '1'
  description: Read-only JSON access to the Edgepedia encyclopedia articles. Keyless. 600 requests a minute and 100,000 a day per IP address (429 with Retry-After past that). Free with credit under the Edgepedia Community License 1.0; AI training is open to everyone.
  license:
    name: Edgepedia Community License 1.0
    url: https://www.edgechat.ai/edgepedia/license
  contact:
    url: https://www.edgechat.ai/developers
    name: EdgeChat
    email: olivia.jin@biostate.ai
  x-logo:
    url: https://www.edgechat.ai/assets/edgechat-chestnut-orange-logo-v2.png
    altText: EdgeChat
    backgroundColor: '#FFFFFF'
    href: https://www.edgechat.ai/developers
  x-origin:
  - format: openapi
    version: '3.1'
    url: https://www.edgechat.ai/openapi.json
servers:
- url: https://www.edgechat.ai/api/v1
tags:
- name: Related
paths:
  /related/{slug}:
    get:
      operationId: getRelated
      summary: An article's neighbors in one call
      description: '`siblings`: up to 10 articles nearest it in its own topic, in title order. `cousins`: up to 8 other topics under its parent topic, 3 articles each. `geo`: up to 10 articles nearest it in each geography node it sits in. Also `/related?id={id}`.'
      parameters:
      - name: slug
        in: path
        required: true
        schema:
          type: string
        example: koala
      - name: by
        in: query
        schema:
          type: string
          enum:
          - links
      - name: format
        in: query
        schema:
          type: string
          enum:
          - json
          - mermaid
      - $ref: '#/components/parameters/fields'
      responses:
        '200':
          description: The groups
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetRelatedResponse'
              examples:
                live:
                  summary: GET https://www.edgechat.ai/api/v1/related/koala
                  description: 'A live answer of 2026-10-07: arrays cut to two items, long text cut with an ellipsis.'
                  value:
                    id: ep7rbwcy0a
                    slug: koala
                    title: Koala
                    siblings:
                      topic:
                        id: life.animals.mammals.monotremes-marsupials
                        label: Monotremes and marsupials
                        api_url: https://www.edgechat.ai/api/v1/topics/life.animals.mammals.monotremes-marsupials
                      total: 31
                      results:
                      - id: epdg91k83d
                        slug: common-brushtail-possum
                        title: Common brushtail possum
                        topic: Life and health
                        excerpt: The common brushtail possum (Trichosurus vulpecula) is a nocturnal, semiarboreal marsupial native to Australia, introduced to New Zealand in the 1830s, where it became a major pest.
                        snippet: The common brushtail possum (Trichosurus vulpecula) is a nocturnal, semiarboreal marsupial native to Australia, introduced to New Zealand in the 1830s, where it became a major pest.
                        node: life.animals.mammals.monotremes-marsupials
                        url: https://www.edgechat.ai/common-brushtail-possum
                        markdown_url: https://www.edgechat.ai/common-brushtail-possum.md
                        api_url: https://www.edgechat.ai/api/v1/articles/common-brushtail-possum
                      - id: ep0mbqwp7d
                        slug: diprotodontia
                        title: Diprotodontia
                        topic: Life and health
                        excerpt: Diprotodontia, whose members are called diprotodonts, is the largest order of marsupials, with about 155 species including kangaroos, koalas, wombats, and possums, restricted to Australasia.
                        snippet: Diprotodontia, whose members are called diprotodonts, is the largest order of marsupials, with about 155 species including kangaroos, koalas, wombats, and possums, restricted to Australasia.
                        node: life.animals.mammals.monotremes-marsupials
                        url: https://www.edgechat.ai/diprotodontia
                        markdown_url: https://www.edgechat.ai/diprotodontia.md
                        api_url: https://www.edgechat.ai/api/v1/articles/diprotodontia
                    cousins:
                    - topic:
                        id: life.animals.mammals.afrotherians-xenarthrans
                        label: Afrotherians, xenarthrans, and other minor placental orders
                        api_url: https://www.edgechat.ai/api/v1/topics/life.animals.mammals.afrotherians-xenarthrans
                      articles: 28
                      results:
                      - id: epqm6f3fhk
                        slug: aardvark
                        title: Aardvark
                        topic: Life and health
                        excerpt: The aardvark (Orycteropus afer), also called the earth pig or African ant bear, is a nocturnal burrowing mammal of sub-Saharan Africa that eats ants and termites.
                        snippet: The aardvark (Orycteropus afer), also called the earth pig or African ant bear, is a nocturnal burrowing mammal of sub-Saharan Africa that eats ants and termites.
                        node: life.animals.mammals.afrotherians-xenarthrans
                        url: https://www.edgechat.ai/aardvark
                        markdown_url: https://www.edgechat.ai/aardvark.md
                        api_url: https://www.edgechat.ai/api/v1/articles/aardvark
                      - id: epdp1qf87h
                        slug: afrotheria
                        title: Afrotheria
                        topic: Life and health
                        excerpt: Afrotheria, or afrotheres, is a clade of placental mammals of African origin, including elephants, aardvarks, hyraxes, tenrecs, golden moles, and sea cows, recognized in 1998 through DNA analysis.
                        snippet: Afrotheria, or afrotheres, is a clade of placental mammals of African origin, including elephants, aardvarks, hyraxes, tenrecs, golden moles, and sea cows, recognized in 1998 through DNA analysis.
                        node: life.animals.mammals.afrotherians-xenarthrans
                        url: https://www.edgechat.ai/afrotheria
                        markdown_url: https://www.edgechat.ai/afrotheria.md
                        api_url: https://www.edgechat.ai/api/v1/articles/afrotheria
                    - topic:
                        id: life.animals.mammals.elephants
                        label: Elephants
                        api_url: https://www.edgechat.ai/api/v1/topics/life.animals.mammals.elephants
                      articles: 15
                      results:
                      - id: epd2ada3qz
                        slug: african-bush-elephant
                        title: African bush elephant
                        topic: Life and health
                        excerpt: The African bush elephant (Loxodonta africana), also called the African savanna elephant, is the largest living terrestrial animal, ranging across 37 African countries and listed as Endangered since 2021.
                        snippet: The African bush elephant (Loxodonta africana), also called the African savanna elephant, is the largest living terrestrial animal, ranging across 37 African countries and listed as Endangered since 2021.
                        node: life.animals.mammals.elephants
                        url: https://www.edgechat.ai/african-bush-elephant
                        markdown_url: https://www.edgechat.ai/african-bush-elephant.md
                        api_url: https://www.edgechat.ai/api/v1/articles/african-bush-elephant
                      - id: ep8g70zfkp
                        slug: african-elephant
                        title: African elephant
                        topic: Life and health
                        excerpt: The African elephant is a genus, Loxodonta, of two species, the bush elephant and the forest elephant, native to Sub-Saharan Africa and threatened by poaching and habitat loss.
                        snippet: The African elephant is a genus, Loxodonta, of two species, the bush elephant and the forest elephant, native to Sub-Saharan Africa and threatened by poaching and habitat loss.
                        node: life.animals.mammals.elephants
                        url: https://www.edgechat.ai/african-elephant
                        markdown_url: https://www.edgechat.ai/african-elephant.md
                        api_url: https://www.edgechat.ai/api/v1/articles/african-elephant
                    geo:
                    - topic:
                        id: geo.other.nodate.life.animals.mammals.monotremes-marsupials
                        label: 'Other (Canada, Oceania, polar regions, oceans) · Not dated: Monotremes and marsupials'
                        api_url: https://www.edgechat.ai/api/v1/geo/geo.other.nodate.life.animals.mammals.monotremes-marsupials
                      total: 27
                      results:
                      - id: epdg91k83d
                        slug: common-brushtail-possum
                        title: Common brushtail possum
                        topic: Life and health
                        excerpt: The common brushtail possum (Trichosurus vulpecula) is a nocturnal, semiarboreal marsupial native to Australia, introduced to New Zealand in the 1830s, where it became a major pest.
                        snippet: The common brushtail possum (Trichosurus vulpecula) is a nocturnal, semiarboreal marsupial native to Australia, introduced to New Zealand in the 1830s, where it became a major pest.
                        node: life.animals.mammals.monotremes-marsupials
                        url: https://www.edgechat.ai/common-brushtail-possum
                        markdown_url: https://www.edgechat.ai/common-brushtail-possum.md
                        api_url: https://www.edgechat.ai/api/v1/articles/common-brushtail-possum
                      - id: ep0mbqwp7d
                        slug: diprotodontia
                        title: Diprotodontia
                        topic: Life and health
                        excerpt: Diprotodontia, whose members are called diprotodonts, is the largest order of marsupials, with about 155 species including kangaroos, koalas, wombats, and possums, restricted to Australasia.
                        snippet: Diprotodontia, whose members are called diprotodonts, is the largest order of marsupials, with about 155 species including kangaroos, koalas, wombats, and possums, restricted to Australasia.
                        node: life.animals.mammals.monotremes-marsupials
                        url: https://www.edgechat.ai/diprotodontia
                        markdown_url: https://www.edgechat.ai/diprotodontia.md
                        api_url: https://www.edgechat.ai/api/v1/articles/diprotodontia
                    license:
                      name: Edgepedia Community License 1.0
                      url: https://www.edgechat.ai/edgepedia/license
                      summary: Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.
            text/plain:
              schema:
                type: string
                description: 'format=mermaid: a Mermaid diagram as text.'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
            ETag:
              $ref: '#/components/headers/ETag'
            Last-Modified:
              $ref: '#/components/headers/Last-Modified'
            Content-Digest:
              $ref: '#/components/headers/Content-Digest'
            Edgepedia-Corpus-Version:
              $ref: '#/components/headers/Edgepedia-Corpus-Version'
        '400':
          $ref: '#/components/responses/UnknownParameter'
        '404':
          description: Not found, or the switch for this route is off
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
        '405':
          $ref: '#/components/responses/MethodNotAllowed'
        '429':
          description: An error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
            RateLimit:
              $ref: '#/components/headers/RateLimit'
            Retry-After:
              description: Seconds to wait before the next request.
              schema:
                type: integer
        '503':
          description: Briefly unavailable; try again
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
        '410':
          description: An error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
      tags:
      - Related
  /related:
    get:
      operationId: getRelatedById
      summary: An article's neighbors in one call (by id)
      description: '`siblings`: up to 10 articles nearest it in its own topic, in title order. `cousins`: up to 8 other topics under its parent topic, 3 articles each. `geo`: up to 10 articles nearest it in each geography node it sits in. Also `/related?id={id}`.'
      parameters:
      - name: id
        in: query
        schema:
          type: string
        description: The article's id (ep…), an older id, its address, or its title.
        required: true
        example: ep7rbwcy0a
      - name: by
        in: query
        schema:
          type: string
          enum:
          - links
      - name: format
        in: query
        schema:
          type: string
          enum:
          - json
          - mermaid
      - $ref: '#/components/parameters/fields'
      responses:
        '200':
          description: The groups
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GetRelatedResponse'
              examples:
                live:
                  summary: GET https://www.edgechat.ai/api/v1/related/koala
                  description: 'A live answer of 2026-10-07: arrays cut to two items, long text cut with an ellipsis. The same answer as ?id= with the article''s id.'
                  value:
                    id: ep7rbwcy0a
                    slug: koala
                    title: Koala
                    siblings:
                      topic:
                        id: life.animals.mammals.monotremes-marsupials
                        label: Monotremes and marsupials
                        api_url: https://www.edgechat.ai/api/v1/topics/life.animals.mammals.monotremes-marsupials
                      total: 31
                      results:
                      - id: epdg91k83d
                        slug: common-brushtail-possum
                        title: Common brushtail possum
                        topic: Life and health
                        excerpt: The common brushtail possum (Trichosurus vulpecula) is a nocturnal, semiarboreal marsupial native to Australia, introduced to New Zealand in the 1830s, where it became a major pest.
                        snippet: The common brushtail possum (Trichosurus vulpecula) is a nocturnal, semiarboreal marsupial native to Australia, introduced to New Zealand in the 1830s, where it became a major pest.
                        node: life.animals.mammals.monotremes-marsupials
                        url: https://www.edgechat.ai/common-brushtail-possum
                        markdown_url: https://www.edgechat.ai/common-brushtail-possum.md
                        api_url: https://www.edgechat.ai/api/v1/articles/common-brushtail-possum
                      - id: ep0mbqwp7d
                        slug: diprotodontia
                        title: Diprotodontia
                        topic: Life and health
                        excerpt: Diprotodontia, whose members are called diprotodonts, is the largest order of marsupials, with about 155 species including kangaroos, koalas, wombats, and possums, restricted to Australasia.
                        snippet: Diprotodontia, whose members are called diprotodonts, is the largest order of marsupials, with about 155 species including kangaroos, koalas, wombats, and possums, restricted to Australasia.
                        node: life.animals.mammals.monotremes-marsupials
                        url: https://www.edgechat.ai/diprotodontia
                        markdown_url: https://www.edgechat.ai/diprotodontia.md
                        api_url: https://www.edgechat.ai/api/v1/articles/diprotodontia
                    cousins:
                    - topic:
                        id: life.animals.mammals.afrotherians-xenarthrans
                        label: Afrotherians, xenarthrans, and other minor placental orders
                        api_url: https://www.edgechat.ai/api/v1/topics/life.animals.mammals.afrotherians-xenarthrans
                      articles: 28
                      results:
                      - id: epqm6f3fhk
                        slug: aardvark
                        title: Aardvark
                        topic: Life and health
                        excerpt: The aardvark (Orycteropus afer), also called the earth pig or African ant bear, is a nocturnal burrowing mammal of sub-Saharan Africa that eats ants and termites.
                        snippet: The aardvark (Orycteropus afer), also called the earth pig or African ant bear, is a nocturnal burrowing mammal of sub-Saharan Africa that eats ants and termites.
                        node: life.animals.mammals.afrotherians-xenarthrans
                        url: https://www.edgechat.ai/aardvark
                        markdown_url: https://www.edgechat.ai/aardvark.md
                        api_url: https://www.edgechat.ai/api/v1/articles/aardvark
                      - id: epdp1qf87h
                        slug: afrotheria
                        title: Afrotheria
                        topic: Life and health
                        excerpt: Afrotheria, or afrotheres, is a clade of placental mammals of African origin, including elephants, aardvarks, hyraxes, tenrecs, golden moles, and sea cows, recognized in 1998 through DNA analysis.
                        snippet: Afrotheria, or afrotheres, is a clade of placental mammals of African origin, including elephants, aardvarks, hyraxes, tenrecs, golden moles, and sea cows, recognized in 1998 through DNA analysis.
                        node: life.animals.mammals.afrotherians-xenarthrans
                        url: https://www.edgechat.ai/afrotheria
                        markdown_url: https://www.edgechat.ai/afrotheria.md
                        api_url: https://www.edgechat.ai/api/v1/articles/afrotheria
                    - topic:
                        id: life.animals.mammals.elephants
                        label: Elephants
                        api_url: https://www.edgechat.ai/api/v1/topics/life.animals.mammals.elephants
                      articles: 15
                      results:
                      - id: epd2ada3qz
                        slug: african-bush-elephant
                        title: African bush elephant
                        topic: Life and health
                        excerpt: The African bush elephant (Loxodonta africana), also called the African savanna elephant, is the largest living terrestrial animal, ranging across 37 African countries and listed as Endangered since 2021.
                        snippet: The African bush elephant (Loxodonta africana), also called the African savanna elephant, is the largest living terrestrial animal, ranging across 37 African countries and listed as Endangered since 2021.
                        node: life.animals.mammals.elephants
                        url: https://www.edgechat.ai/african-bush-elephant
                        markdown_url: https://www.edgechat.ai/african-bush-elephant.md
                        api_url: https://www.edgechat.ai/api/v1/articles/african-bush-elephant
                      - id: ep8g70zfkp
                        slug: african-elephant
                        title: African elephant
                        topic: Life and health
                        excerpt: The African elephant is a genus, Loxodonta, of two species, the bush elephant and the forest elephant, native to Sub-Saharan Africa and threatened by poaching and habitat loss.
                        snippet: The African elephant is a genus, Loxodonta, of two species, the bush elephant and the forest elephant, native to Sub-Saharan Africa and threatened by poaching and habitat loss.
                        node: life.animals.mammals.elephants
                        url: https://www.edgechat.ai/african-elephant
                        markdown_url: https://www.edgechat.ai/african-elephant.md
                        api_url: https://www.edgechat.ai/api/v1/articles/african-elephant
                    geo:
                    - topic:
                        id: geo.other.nodate.life.animals.mammals.monotremes-marsupials
                        label: 'Other (Canada, Oceania, polar regions, oceans) · Not dated: Monotremes and marsupials'
                        api_url: https://www.edgechat.ai/api/v1/geo/geo.other.nodate.life.animals.mammals.monotremes-marsupials
                      total: 27
                      results:
                      - id: epdg91k83d
                        slug: common-brushtail-possum
                        title: Common brushtail possum
                        topic: Life and health
                        excerpt: The common brushtail possum (Trichosurus vulpecula) is a nocturnal, semiarboreal marsupial native to Australia, introduced to New Zealand in the 1830s, where it became a major pest.
                        snippet: The common brushtail possum (Trichosurus vulpecula) is a nocturnal, semiarboreal marsupial native to Australia, introduced to New Zealand in the 1830s, where it became a major pest.
                        node: life.animals.mammals.monotremes-marsupials
                        url: https://www.edgechat.ai/common-brushtail-possum
                        markdown_url: https://www.edgechat.ai/common-brushtail-possum.md
                        api_url: https://www.edgechat.ai/api/v1/articles/common-brushtail-possum
                      - id: ep0mbqwp7d
                        slug: diprotodontia
                        title: Diprotodontia
                        topic: Life and health
                        excerpt: Diprotodontia, whose members are called diprotodonts, is the largest order of marsupials, with about 155 species including kangaroos, koalas, wombats, and possums, restricted to Australasia.
                        snippet: Diprotodontia, whose members are called diprotodonts, is the largest order of marsupials, with about 155 species including kangaroos, koalas, wombats, and possums, restricted to Australasia.
                        node: life.animals.mammals.monotremes-marsupials
                        url: https://www.edgechat.ai/diprotodontia
                        markdown_url: https://www.edgechat.ai/diprotodontia.md
                        api_url: https://www.edgechat.ai/api/v1/articles/diprotodontia
                    license:
                      name: Edgepedia Community License 1.0
                      url: https://www.edgechat.ai/edgepedia/license
                      summary: Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.
            text/plain:
              schema:
                type: string
                description: 'format=mermaid: a Mermaid diagram as text.'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
            ETag:
              $ref: '#/components/headers/ETag'
            Last-Modified:
              $ref: '#/components/headers/Last-Modified'
            Content-Digest:
              $ref: '#/components/headers/Content-Digest'
            Edgepedia-Corpus-Version:
              $ref: '#/components/headers/Edgepedia-Corpus-Version'
        '400':
          $ref: '#/components/responses/UnknownParameter'
        '404':
          description: Not found, or the switch for this route is off
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
        '405':
          $ref: '#/components/responses/MethodNotAllowed'
        '429':
          description: An error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
            RateLimit:
              $ref: '#/components/headers/RateLimit'
            Retry-After:
              description: Seconds to wait before the next request.
              schema:
                type: integer
        '503':
          description: Briefly unavailable; try again
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
        '410':
          description: An error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
          headers:
            RateLimit-Policy:
              $ref: '#/components/headers/RateLimit-Policy'
      tags:
      - Related
components:
  responses:
    MethodNotAllowed:
      description: '`method_not_allowed`: the API is read-only; use GET or HEAD (OPTIONS answers CORS preflights). The `Allow` header lists the methods.'
      headers:
        Allow:
          schema:
            type: string
          description: GET, HEAD, OPTIONS
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    UnknownParameter:
      description: '`unknown_parameter`: the request carries a query parameter this route does not read (or one given twice). Each route reads only the parameters listed for it.'
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  headers:
    RateLimit-Policy:
      description: 'The limiter''s two windows, per IP address and per server instance (IETF RateLimit header fields): 600 requests a minute and 100,000 a day.'
      schema:
        type: string
        example: '"minute";q=600;w=60, "day";q=100000;w=86400'
    RateLimit:
      description: 'On a 429 only: the window that was exceeded, no requests remaining (r=0), and the seconds until it resets (t).'
      schema:
        type: string
        example: '"minute";r=0;t=42'
    Edgepedia-Corpus-Version:
      description: The corpus release that answered.
      schema:
        type: string
    Content-Digest:
      description: sha-256 of the body (RFC 9530).
      schema:
        type: string
    Last-Modified:
      description: The corpus release date (informational; only the ETag validates).
      schema:
        type: string
    ETag:
      description: A hash of the body; send it back as If-None-Match for a 304.
      schema:
        type: string
  schemas:
    ArticleSummary:
      type: object
      properties:
        id:
          type: string
        slug:
          type: string
        title:
          type: string
        topic:
          type:
          - string
          - 'null'
          description: The top-level branch of the topic tree the article is under. Its own topic is the last entry of the article's `topic_path`.
        excerpt:
          type: string
          description: The corpus snippet when available, otherwise the article opening as plain text. Older listing excerpts may end in an ellipsis (…).
        url:
          type: string
          format: uri
        markdown_url:
          type: string
          format: uri
        api_url:
          type: string
          format: uri
        snippet:
          type: string
          description: Optional corpus-authored summary, separate from the article opening. Present on corpus-v1.5 articles and their preview results.
        node:
          type: string
          description: Current concept-tree node of the article, when available. May change when the corpus tree is revised.
      required:
      - id
      - slug
      - title
      - excerpt
      - url
      - markdown_url
      - api_url
    Topic:
      type: object
      properties:
        id:
          type: string
        label:
          type: string
        articles:
          type: integer
        api_url:
          type: string
          format: uri
      required:
      - id
      - label
      - api_url
    Error:
      type: object
      properties:
        error:
          type: object
          properties:
            code:
              type: string
            message:
              type: string
            hint:
              type: string
            next:
              type: string
              format: uri
            did_you_mean:
              type: array
              items:
                type: object
                properties:
                  id:
                    type: string
                  slug:
                    type: string
                  title:
                    type: string
                  api_url:
                    type: string
          required:
          - code
          - message
      required:
      - error
    GetRelatedResponse:
      type: object
      properties:
        id:
          type: string
        slug:
          type: string
        title:
          type: string
        siblings:
          oneOf:
          - type: object
            properties:
              topic:
                $ref: '#/components/schemas/Topic'
              total:
                type: integer
              results:
                type: array
                items:
                  $ref: '#/components/schemas/ArticleSummary'
          - type: 'null'
        cousins:
          type: array
          items:
            type: object
            properties:
              topic:
                $ref: '#/components/schemas/Topic'
              articles:
                type: integer
              results:
                type: array
                items:
                  $ref: '#/components/schemas/ArticleSummary'
        geo:
          type: array
          items:
            type: object
            properties:
              topic:
                $ref: '#/components/schemas/Topic'
              total:
                type: integer
              results:
                type: array
                items:
                  $ref: '#/components/schemas/ArticleSummary'
        license:
          $ref: '#/components/schemas/License'
    License:
      type: object
      properties:
        name:
          type: string
        url:
          type: string
          format: uri
        summary:
          type: string
        spdx:
          type: string
          example: LicenseRef-Edgepedia-Community-1.0
      required:
      - name
      - url
  parameters:
    fields:
      name: fields
      in: query
      required: false
      description: 'Comma-separated keys: each result (or the answer, when it has no results) keeps only these.'
      schema:
        type: string