{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://consultations.caa.co.uk/schemas/activity",
  "title": "Consultation activity",
  "$comment": "Derived by the API Evangelist enrichment pipeline from openapi/uk-caa-consultations-api-openapi.yml, itself transcribed verbatim from the CAA's published API reference at https://consultations.caa.co.uk/api/2.4/ and cross-checked against a live anonymous response. The UK CAA publishes no JSON Schema of its own. Derived 2026-07-28.",
  "description": "A published consultation or engagement activity. Field groups follow the `fields` parameter: basic fields are always present, fields marked extended require fields=extended or above, fields marked all require fields=all.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "The ID of the activity"
    },
    "title": {
      "type": "string",
      "description": "The title of the activity"
    },
    "url": {
      "type": "string",
      "description": "The URL of the activity"
    },
    "status": {
      "type": "string",
      "enum": [
        "open",
        "forthcoming",
        "closed"
      ],
      "description": "State: one of `open`, `forthcoming` or `closed`"
    },
    "overview": {
      "type": "string",
      "description": "Overview of the activity (HTML)"
    },
    "startdate": {
      "type": "string",
      "description": "The date the activity opens / opened on (observed format yyyy/mm/dd)"
    },
    "enddate": {
      "type": "string",
      "description": "The date the activity closes / closed on (observed format yyyy/mm/dd)"
    },
    "activity_type": {
      "type": "string",
      "description": "The activity type ID"
    },
    "workspace_title": {
      "type": "string",
      "description": "The title of the workspace that the activity belongs to (extended and above)"
    },
    "workspace_id": {
      "type": "string",
      "description": "The ID of the workspace that the activity belongs to (extended and above)"
    },
    "department": {
      "type": "string",
      "deprecated": true,
      "description": "(deprecated) The name of the department that the activity belongs to (extended and above)"
    },
    "dept": {
      "type": "string",
      "deprecated": true,
      "description": "(deprecated) The ID of the department that the activity belongs to (extended and above)"
    },
    "type_string": {
      "type": "string",
      "description": "Human readable activity type (extended and above)"
    },
    "type": {
      "type": "string",
      "deprecated": true,
      "description": "(deprecated) The legacy type (extended and above)"
    },
    "participate_url": {
      "type": "string",
      "x-doc-name": "participation_url",
      "description": "The direct URL to the participation method (survey etc), skipping the overview page (extended and above). The published reference names this field `participation_url`; the live 2.4 response emits `participate_url` \u2014 verified 2026-07-28."
    },
    "progress": {
      "type": "string",
      "description": "The current state of the activity (extended and above)"
    },
    "visibility": {
      "type": "string",
      "enum": [
        "public",
        "private"
      ],
      "description": "Either 'public' or 'private' depending on if the activity has been hidden from end users (extended and above)"
    },
    "why": {
      "type": [
        "string",
        "null"
      ],
      "description": "The contents of the 'why are we consulting?' field (all only)"
    },
    "what_happens_next": {
      "type": [
        "string",
        "null"
      ],
      "description": "The contents of the 'what happens next?' field (all only)"
    },
    "feedbackdate": {
      "type": "string",
      "description": "The date that activity feedback is/was expected (all only)"
    },
    "resultdate": {
      "type": "string",
      "x-doc-name": "resultsdate",
      "description": "The date that activity results are/were expected (all only). The published reference names this field `resultsdate`; the live 2.4 response emits `resultdate` \u2014 verified 2026-07-28."
    },
    "contact_name": {
      "type": "string",
      "description": "The full name entered in the activity's contact details (all only)"
    },
    "contact_jobtitle": {
      "type": "string",
      "description": "The job title entered in the activity's contact details (all only)"
    },
    "contact_team": {
      "type": "string",
      "description": "The team name entered in the activity's contact details (all only)"
    },
    "contact_phone": {
      "type": "string",
      "description": "The phone number entered in the activity's contact details (all only)"
    },
    "contact_email": {
      "type": "string",
      "description": "The email address entered in the activity's contact details (all only)"
    },
    "related_links": {
      "type": "array",
      "description": "A list of related links (all only)",
      "items": {
        "$ref": "uk-caa-related-link.json"
      }
    },
    "related_consultations": {
      "type": "array",
      "description": "A list of related activities (all only)",
      "items": {
        "$ref": "uk-caa-related-link.json"
      }
    },
    "supporting_documents": {
      "type": "array",
      "description": "A list of supporting documents (all only)",
      "items": {
        "$ref": "uk-caa-supporting-document.json"
      }
    },
    "audiences": {
      "type": "array",
      "description": "A list of audiences this activity applies to (all only)",
      "items": {
        "$ref": "uk-caa-term.json"
      }
    },
    "areas": {
      "type": "array",
      "description": "A list of ids for areas this activity applies to. NB: This field is omitted unless area support is installed (all only)",
      "items": {
        "$ref": "uk-caa-term.json"
      }
    },
    "interests": {
      "type": "array",
      "description": "A list of ids for interests this activity applies to (all only)",
      "items": {
        "$ref": "uk-caa-term.json"
      }
    }
  },
  "x-observed-values": {
    "activity_type": {
      "basic_survey": 225,
      "consultation": 1,
      "basic_form": 4,
      "File": 51,
      "Link": 11,
      "Document": 2
    },
    "type_string": {
      "Online Survey": 225,
      "Consultation": 1,
      "Form": 4,
      "Email/Postal Activity": 51,
      "Link": 11,
      "Offline Activity": 2
    },
    "type": {
      "QuickConsult": 230,
      "File": 51,
      "Link": 11,
      "Document": 2
    },
    "progress": {
      "published": 294
    },
    "visibility": {
      "public": 294
    },
    "status": {
      "open": 17,
      "closed": 277
    }
  },
  "x-observed-source": "https://consultations.caa.co.uk/api/2.4/json_search_results?fields=all - 294 activities, HTTP 200, fetched 2026-07-28",
  "x-required-note": "The API declares no required fields. Every field above was present on all 294 activities in the live corpus except optional arrays and the 'all'-tier fields; no required[] is asserted here because the provider asserts none."
}