{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://computering.london/schema/sites.geojson.json",
  "$version": "0.1.0",
  "title": "London Compute Ring sites",
  "description": "FeatureCollection of data-centre sites. Coordinates are GeoJSON-native [lng, lat].",
  "type": "object",
  "required": ["$version", "type", "features"],
  "properties": {
    "$version": { "type": "string" },
    "type": { "const": "FeatureCollection" },
    "features": {
      "type": "array",
      "items": { "$ref": "#/$defs/siteFeature" }
    }
  },
  "$defs": {
    "quantity": {
      "oneOf": [
        { "type": "null" },
        {
          "type": "object",
          "required": ["value", "unit", "basis", "source"],
          "properties": {
            "value": { "type": "number" },
            "unit": { "type": "string" },
            "basis": {
              "enum": ["stated", "planning_doc", "estimated", "measured"]
            },
            "source": { "type": "string" },
            "page": { "type": ["string", "null"] },
            "archived": { "type": ["string", "null"] }
          },
          "additionalProperties": false
        }
      ]
    },
    "siteFeature": {
      "type": "object",
      "required": ["type", "geometry", "properties"],
      "properties": {
        "type": { "const": "Feature" },
        "geometry": {
          "type": "object",
          "required": ["type", "coordinates"],
          "properties": {
            "type": { "const": "Point" },
            "coordinates": {
              "type": "array",
              "minItems": 2,
              "maxItems": 2,
              "items": { "type": "number" },
              "description": "[longitude, latitude] — GeoJSON order"
            }
          }
        },
        "properties": { "$ref": "#/$defs/siteProperties" }
      }
    },
    "siteProperties": {
      "type": "object",
      "required": [
        "id",
        "name",
        "operator",
        "status",
        "local_authority",
        "corridor",
        "planning_ref",
        "power",
        "land",
        "claims_on_record",
        "sources",
        "last_reviewed"
      ],
      "properties": {
        "id": { "type": "string", "pattern": "^[a-z0-9-]+$" },
        "name": { "type": "string" },
        "operator": { "type": "string" },
        "status": {
          "enum": [
            "proposed",
            "in_planning",
            "approved",
            "under_construction",
            "operating",
            "decommissioned",
            "refused",
            "withdrawn"
          ]
        },
        "local_authority": { "type": "string" },
        "corridor": {
          "enum": ["west", "east", "north", "south", "inner"],
          "description": "Map filter group by compass fringe around Greater London (not M25-only). West / Slough–Heathrow, Docklands / East, North fringe, South fringe, or Inner London. The M25 is the orbital context for the whole map."
        },
        "planning_ref": {
          "type": "object",
          "required": ["id", "url"],
          "properties": {
            "id": { "type": ["string", "null"] },
            "url": { "type": ["string", "null"] }
          }
        },
        "power": {
          "type": "object",
          "required": [
            "grid_connection_mw",
            "it_load_mw",
            "phase_1_mw",
            "max_proposed_mw"
          ],
          "properties": {
            "grid_connection_mw": { "$ref": "#/$defs/quantity" },
            "it_load_mw": { "$ref": "#/$defs/quantity" },
            "phase_1_mw": { "$ref": "#/$defs/quantity" },
            "max_proposed_mw": { "$ref": "#/$defs/quantity" }
          }
        },
        "water_litres_pa": { "$ref": "#/$defs/quantity" },
        "land": {
          "type": "object",
          "required": ["acres", "previous_use", "land_type"],
          "properties": {
            "acres": { "$ref": "#/$defs/quantity" },
            "previous_use": { "type": ["string", "null"] },
            "land_type": {
              "enum": ["brownfield", "agricultural", "industrial_active"]
            },
            "alc_grades": { "type": ["string", "null"] }
          }
        },
        "grid_connection": { "type": ["object", "null"] },
        "cooling": { "type": ["object", "null"] },
        "claims_on_record": { "type": "array" },
        "operator_response": { "type": ["object", "null"] },
        "timeline": { "type": "array" },
        "controversies": { "type": "array" },
        "sources": { "type": "array" },
        "last_reviewed": { "type": "string", "format": "date" },
        "summary": { "type": "string" },
        "role": {
          "enum": ["aggregate"],
          "description": "Campus pin whose megawatts are also carried by individually mapped hall pins; excluded from regional totals to avoid double-counting."
        },
        "part_of": {
          "type": "string",
          "description": "id of the campus 'aggregate' dossier this hall belongs to."
        },
        "operational_reality": {
          "enum": ["operating", "under_construction", "consented", "pipeline", "closed"],
          "description": "Physical maturity, independent of the planning-gated status; drives the pipeline view."
        },
        "beyond_m25": {
          "type": "boolean",
          "description": "Site is materially beyond the M25 orbital, included on operator London-metro branding; shown with a 'beyond M25' tag."
        }
      }
    }
  }
}