---
title: "Check if concepts or collections exist in a scheme."
method: HEAD
path: "/conceptschemes/{scheme_id}/c"
tags: ["Pyramid_skosprovider"]
---

# Check if concepts or collections exist in a scheme.

`HEAD /conceptschemes/{scheme_id}/c`

## Request

- Base URL: `/` (relative, and the document was published on a file host, not at the API’s origin)
- URL: `/conceptschemes/{scheme_id}/c`
- Auth: none declared
- TypeScript: <https://skmtc.dev/onroerenderfgoed/apis/atramhasis-api/docs/conceptschemes/:scheme_id/c/head.ts> (a function with typed inputs; its response is checked against the schema)

## Path parameters

- `scheme_id` string, required

## Query parameters

- `type` string
- `mode` string
- `label` string
- `collection` string
- `sort` string
- `language` string

## Response `200`

The concepts in this conceptscheme were found.

## Other responses

- `404`: The conceptscheme was not found.

## Changes

- **2026-03-16** `8bfc927527b6`: 1 info
  - endpoint added
- **2021-12-20** `720170256c20`: 1 breaking
  - api removed without deprecation

[Operation history](https://skmtc.dev/onroerenderfgoed/apis/atramhasis-api/changes/conceptschemes/:scheme_id/c/head.md)

---

[API](https://skmtc.dev/onroerenderfgoed/apis/atramhasis-api.md) - [All operations](https://skmtc.dev/onroerenderfgoed/apis/atramhasis-api/llms.txt) - [OpenAPI document](https://skmtc.dev/onroerenderfgoed/apis/atramhasis-api/revisions/c2d0b54078a2?raw)