{
  "protocol": {
    "name": "rostack",
    "version": "rostack_v1"
  },
  "implementation": {
    "id": "example-observatory",
    "name": "Example Observatory",
    "api_version": "2026-08",
    "documentation_url": "https://api.example.com/docs"
  },
  "endpoints": {
    "discovery": "https://api.example.com/.well-known/rostack",
    "json_api": "https://api.example.com/v/2026-08",
    "websocket": "wss://gateway.example.com/v/2026-08/events"
  },
  "authentication": {
    "discovery_public": true,
    "methods": [
      {
        "type": "oauth2",
        "authorization_server_metadata": "https://auth.example.com/.well-known/oauth-authorization-server"
      },
      {
        "type": "shared_token",
        "http_authorization_scheme": "Rostack-Token",
        "provisioning": "out_of_band",
        "description": "Request a token from the observatory operator."
      }
    ],
    "permissions": {
      "observations:read": "Read observations",
      "observations:subscribe": "Subscribe to observation events"
    }
  },
  "capabilities": {
    "filter_operators": ["eq", "ne", "gt", "gte", "lt", "lte", "in", "exists"],
    "max_page_size": 500,
    "websocket": {
      "event_encodings": ["json", "compact-json"],
      "extensions": ["permessage-deflate"],
      "authentication_timeout_ms": 10000,
      "heartbeat_interval_ms": 30000,
      "heartbeat_timeout_ms": 10000,
      "reconnect_min_delay_ms": 500,
      "reconnect_max_delay_ms": 30000,
      "discovery_refresh_after_ms": 300000
    }
  },
  "resources": [
    {
      "name": "observations",
      "description": "Measurements produced by this implementation.",
      "collection_url": "https://api.example.com/v/2026-08/observations",
      "item_url_template": "https://api.example.com/v/2026-08/observations/{id}",
      "representations": [
        {
          "media_type": "application/json",
          "schema_url": "https://api.example.com/v/2026-08/schemas/observation.json",
          "schema_dialect": "https://json-schema.org/draft/2020-12/schema",
          "description": "Native observation record."
        }
      ],
      "events": [
        {
          "name": "observation.created",
          "schema_url": "https://api.example.com/v/2026-08/schemas/observation-event.json",
          "schema_dialect": "https://json-schema.org/draft/2020-12/schema",
          "description": "An observation entered the selected data set.",
          "state_transition": "create",
          "tombstone": false
        },
        {
          "name": "observation.updated",
          "schema_url": "https://api.example.com/v/2026-08/schemas/observation-event.json",
          "schema_dialect": "https://json-schema.org/draft/2020-12/schema",
          "description": "An observation changed while remaining selected.",
          "state_transition": "update",
          "tombstone": false
        },
        {
          "name": "observation.deleted",
          "schema_url": "https://api.example.com/v/2026-08/schemas/observation-tombstone.json",
          "schema_dialect": "https://json-schema.org/draft/2020-12/schema",
          "description": "An observation left the selected data set.",
          "state_transition": "delete",
          "tombstone": true
        }
      ],
      "event_filtering": true,
      "filtering": {
        "filterable_fields": {
          "/station_id": ["eq", "in"],
          "/observed_at": ["gt", "gte", "lt", "lte"],
          "/quality/verified": ["eq", "exists"]
        },
        "sortable_fields": ["/observed_at", "/station_id"]
      },
      "read_permissions": ["observations:read"],
      "subscribe_permissions": ["observations:subscribe"]
    }
  ]
}