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Subfields represent specialized research disciplines within a field of study. They sit below fields in the Hexagraph research hierarchy and group together closely related research topics. Subfields are identified by the OA: classification system.

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List subfields

Returns a paginated list of subfields with summary information. 
curl "https://hexagraph-core.onrender.com/subfields"

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Response

[
  {
    "id": "OA:2202",
    "name": "Aerospace Engineering",
    "description": "branch of engineering",
    "outputs": 27269071,
    "citations": 17394030,
    "domain": [
      "Physical Sciences"
    ],
    "field": [
      "Engineering"
    ],
    "siblings": [
      "Artificial Intelligence",
      "Mechanical Engineering"
    ],
    "topics": [
      "Spacecraft Dynamics and Control",
      "Aeroelasticity and Vibration Control"
    ]
  },
 {
      "id": "OA:3106",
      "name": "Nuclear and High Energy Physics",
      "description": "physics of elementary particles at high energies",
      "outputs": 12342447,
      "citations": 22882285,
      "domain": [
        "Physical Sciences"
      ],
      "field": [
        "Physics and Astronomy"
      ],
      "siblings": [
        "General Agricultural and Biological Sciences",
        "Agronomy and Crop Science"
      ],
      "topics": [
        "Black Holes and Theoretical Physics",
        "Particle physics theoretical and experimental studies"
      ]
    }
]
Each subfield summary includes:
  • id — unique subfield identifier.
  • name — subfield name.
  • description — short description of the discipline.
  • outputs — total number of associated research outputs.
  • citations — total citations received by outputs in the subfield.
  • domain — parent research domain names.
  • field — parent field names.
  • siblings — related subfields within the same field hierarchy.
  • topics — representative research topics associated with the subfield.

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Get a single subfield

Fetch detailed information for a specific subfield. 
curl "https://hexagraph-core.onrender.com/subfields/OA:2202"

​
Response

[
  {
    "id": "OA:2202",
    "name": "Aerospace Engineering",
    "description": "branch of engineering",
    "outputs": 27269071,
    "citations": 17394030,
    "alternate_names": [
      "aeronautical engineering"
    ],
    "domain": {
      "id": "OA:3",
      "name": "Physical Sciences"
    },
    "field": {
      "id": "OA:22",
      "name": "Engineering"
    },
    "wikipedia": "https://en.wikipedia.org/wiki/Aerospace_Engineering",
    "siblings": [
      {
        "id": "OA:1702",
        "name": "Artificial Intelligence"
      }
    ],
    "topics": [
      {
        "id": "OA:T11082",
        "name": "Spacecraft Dynamics and Control"
      }
    ]
  }
]
The detailed response expands the hierarchy and related entities:
  • alternate_names contains commonly used alternative names for the subfield.
  • domain identifies the parent research domain.
  • field identifies the parent field within that domain.
  • wikipedia provides an external reference page when available.
  • siblings lists related subfields, including both identifiers and names.
  • topics contains representative research topics associated with the subfield.